[Federal Register Volume 76, Number 105 (Wednesday, June 1, 2011)]
[Rules and Regulations]
[Pages 31750-31783]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2011-12595]
[[Page 31749]]
Vol. 76
Wednesday,
No. 105
June 1, 2011
Part III
Department of Energy
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10 CFR Part 430
Energy Conservation Program for Certain Consumer Appliances: Test
Procedures for Battery Chargers and External Power Supplies; Final Rule
Federal Register / Vol. 76 , No. 105 / Wednesday, June 1, 2011 /
Rules and Regulations
[[Page 31750]]
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DEPARTMENT OF ENERGY
10 CFR Part 430
[Docket No. EERE-2009-BT-TP-0019]
RIN 1904-AC03
Energy Conservation Program for Certain Consumer Appliances: Test
Procedures for Battery Chargers and External Power Supplies
AGENCY: Office of Energy Efficiency and Renewable Energy, Department of
Energy.
ACTION: Final rule.
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SUMMARY: The U.S. Department of Energy (DOE) is amending its test
procedures for battery chargers and external power supplies. In
particular, DOE is inserting a new active mode energy consumption test
procedure for battery chargers, which is necessary to develop energy
conservation standards for battery chargers as mandated by the Energy
Independence and Security Act of 2007 (EISA 2007). DOE is also amending
portions of its existing standby and off mode battery charger test
procedure by decreasing the required testing time. Further, DOE is
amending its active mode single-voltage external power supply test
procedure to permit the testing of certain types of external power
supplies. Finally, DOE is inserting a new procedure to address
multiple-voltage external power supplies, which are not covered under
the current single-voltage external power supply test procedure.
DATES: This rule is effective July 1, 2011. After November 28, 2011,
manufacturers may not make any representation regarding battery charger
or external power supply energy consumption or efficiency unless such
battery charger or external power supply has been tested in accordance
with the final rule provisions in appendix Y (for battery chargers) and
appendix Z (for external power supplies).
ADDRESSES: You may review copies of all materials related to this
rulemaking at the U.S. Department of Energy, Resource Room of the
Building Technologies Program, 950 L'Enfant Plaza, SW., Suite 600,
Washington, DC, (202) 586-2945, between 9 a.m. and 4 p.m., Monday
through Friday, except Federal Holidays. Please call Ms. Brenda Edwards
at the above telephone number for additional information regarding
visiting the Resource Room.
FOR FURTHER INFORMATION CONTACT: Mr. Victor Petrolati, U.S. Department
of Energy, Office of Energy Efficiency and Renewable Energy, Building
Technologies Program, EE-2J, 1000 Independence Avenue, SW., Washington,
DC 20585-0121. Telephone: (202) 586-4549. E-mail:
[email protected].
For legal issues, contact Mr. Michael Kido, U.S. Department of
Energy, Office of the General Counsel, GC-71, 1000 Independence Avenue,
SW., Washington, DC 20585. Telephone: (202) 586-9507. E-mail:
[email protected].
SUPPLEMENTARY INFORMATION:
I. Authority and Background
II. Summary of the Final Rule
A. Battery Charger Active Mode Test Procedure
B. Review of Battery Charger and External Power Supply Standby
Mode and Off Mode Test Procedures
C. Review of Single-Voltage External Power Supply Test Procedure
D. Multiple-Voltage External Power Supply Test Procedure
III. Discussion
A. Effective Date for the Amended Test Procedures
B. Battery Charger Active Mode Test Procedure
1. Incorporation of the CEC Test Procedure
2. Scope
a. Battery Chargers versus External Power Supplies
b. Input Voltage and Frequency
c. DC Input Battery Chargers
d. High-Power Battery Chargers
e. Consumer Motive Equipment
3. Definitions
a. Deleting Existing Definitions
b. Revising Existing Definitions
c. Adding New Definitions
4. Test Apparatus and General Instructions
a. Confidence Intervals
b. Test Laboratory Temperature
c. Charge Rate Selection
d. Battery Selection
e. Non-Battery Charging Functions
f. Battery Chargers With Protective Circuitry
g. Charge Capacity of Batteries With No Rating
h. Battery Conditioning
i. Rest Period
5. Test Measurement
a. Removing Inactive Mode Energy Consumption Test Apparatus and
Measurement
b. Charge Test Duration
c. Testing Order
d. End-of-Discharge Voltages
e. E 24 Measurement
C. Review of Battery Charger and External Power Supply Standby
and Off Mode Test Procedures
1. Battery Charger Test Procedure Off Mode Definition
2. Test Duration
D. Review of the Single-Voltage External Power Supply Test
Procedure
1. External Power Supplies That Communicate With Their Loads
2. External Power Supplies With Output Current Limiting
3. High-Power External Power Supplies
4. Active Power
E. Multiple-Voltage External Power Supply Test Procedure
F. Test Procedure Amendments Not Incorporated in This Final Rule
1. Incorporating Usage Profiles
2. Measuring Charger Output Energy
3. Alternative Depth-of-Discharge Measurement
IV. Procedural Issues and Regulatory Review
A. Review Under Executive Order 12866
B. Review Under the Regulatory Flexibility Act
C. Review Under the Paperwork Reduction Act
D. Review Under the National Environmental Policy Act
E. Review Under Executive Order 13132
F. Review Under Executive Order 12988
G. Review Under Unfunded Mandates Reform Act of 1995
H. Review Under the Treasury and General Government
Appropriations Act, 1999
I. Review Under Executive Order 12630
J. Review Under Treasury and General Government Appropriations
Act, 2001
K. Review Under Executive Order 13211
L. Review Under Section 32 of the Federal Energy Administration
Act of 1974
M. Congressional Notification
V. Approval of the Office of the Secretary
I. Authority and Background
Title III of the Energy Policy and Conservation Act, 42 U.S.C.
6291, et seq. (EPCA or the Act), sets forth a variety of provisions
designed to improve energy efficiency. Part A of Title III (42 U.S.C.
6291-6309) establishes the ``Energy Conservation Program for Consumer
Products Other Than Automobiles,'' which covers consumer products and
certain commercial products (all of which are referred to below as
``covered products''), including battery chargers and external power
supplies.
Under EPCA, the overall energy conservation program for consumer
products and commercial equipment consists essentially of the following
parts: testing, labeling, and Federal energy conservation standards.
The testing requirements consist of procedures that manufacturers of
covered products must use to certify to the U.S. Department of Energy
(DOE) that their products comply with the required energy conservation
standards and to rate the efficiency of their products. These test
procedures would also be used during enforcement-related testing when
determining whether a given product complies with the relevant
standards.
Today's final rule provides, among other things, a new active mode
energy consumption test procedure for battery chargers, which is
necessary to develop energy conservation standards for battery chargers
as mandated by the Energy Independence and Security Act of 2007 (EISA
2007). Today's rule also
[[Page 31751]]
modifies the existing procedure found in appendix Y to 10 CFR part 430,
subpart B. In particular, the test procedure that DOE is adopting today
provides a uniform method to test the energy efficiency of a battery
charger, which is a necessary prerequisite to the setting of any energy
conservation standard for these products. Consequently, DOE is
promulgating today's rule in anticipation of the final rule that will
set standards for battery chargers.
Additionally, today's rule introduces other changes to the
procedures found in 10 CFR 430, subpart B, appendix Z, which covers the
energy efficiency testing of an external power supply. In particular,
the rule amends aspects of the current procedure when measuring the
energy consumption of a Class A external power supply. A Class A
external power supply is one that is: designed to convert line voltage
AC input into lower voltage AC or DC output; able to convert to only 1
AC or DC output voltage at a time; sold with, or intended to be used
with, a separate end-use product that constitutes the primary load;
contained in a separate physical enclosure from the end-use product; is
connected to the end-use product via a removable or hard-wired male/
female electrical connection, cable, cord, or other wiring; and has
nameplate output power that is less than or equal to 250 watts. See 42
U.S.C. 6291(36)(C). Today's rule also adds a procedure to facilitate
testing of a multiple-voltage external power supply. The test procedure
requires loading the multiple-voltage external power supply at five
separate loading levels and requires that these five outputs be
reported individually.
EPCA sets forth generally applicable criteria and procedures for
DOE's adoption and amendment of such test procedures. See generally 42
U.S.C. 6293. As part of these requirements, the procedures must be
reasonably designed to measure the energy use, energy efficiency, or
annual operating cost during a period that is representative of typical
use and not be ``unduly burdensome.'' (42 U.S.C. 6293(b)(3)) In
addition, consistent with 42 U.S.C. 6293(b)(2) and Executive Order
12899, 58 FR 69681 (Dec. 30, 1993), if DOE determines that a test
procedure amendment is warranted, it must publish proposed test
procedures and offer the public an opportunity to present oral and
written comments on them, with a comment period of not less than 75
days. Finally, in any rulemaking to amend a test procedure, DOE must
determine ``to what extent the proposed test procedure would alter the
measured energy efficiency as determined under the existing test
procedure.'' (42 U.S.C. 6293(e)(1)) If DOE determines that the amended
test procedure would alter the measured efficiency of a covered
product, DOE must amend the applicable energy conservation standard
accordingly. (42 U.S.C. 6293(e)(2)) DOE discusses its consideration of
the amendments to the test procedures for battery chargers and external
power supplies in the section that follows.
DOE published a notice of proposed rulemaking (NOPR) on April 2,
2010 (75 FR 16958) in which it discussed in more detail many of the
testing issues brought forward in the framework document and an
accompanying public meeting to discuss the approach that DOE planned to
use in setting energy conservation standards for battery chargers and
external power supplies. See 74 FR 26816 (June 4, 2009) (discussing the
framework document for battery chargers and external power
supplies).\1\ (The public meeting discussing the framework document was
held on July 16, 2009. That meeting also included discussions related
to test procedure issues. A related meeting to discuss the preliminary
analysis DOE performed in examining standards for these products also
generated some discussion related to test procedure issues.) DOE held a
public meeting to discuss its test procedure NOPR on May 7, 2010, where
it also received comments on the proposals set forth in the NOPR
(hereafter referred to as the NOPR public meeting). A 75-day comment
period as prescribed by EPCA was afforded to interested parties.
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\1\ U.S. Department of Energy--Office of Energy Efficiency and
Renewable Energy. Energy Conservation Program for Consumer Products
Energy Conservation Standards Rulemaking for Battery Chargers and
External Power Supplies. May 2009. Washington, DC. Available at:
http://www1.eere.energy.gov/buildings/appliance_standards/residential/pdfs/bceps_frameworkdocument.pdf.
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Battery chargers and external power supplies operate similarly in
that they both take electricity from a power source, usually from a
wall outlet, and convert it into a form that can be used either to
power an application directly or to charge and maintain the energy in a
battery. Specifically, they both take power at one voltage and current
type, typically 120 volts alternating current (AC), and convert it to
lower-voltage direct current (DC) power. Because these products operate
in a similar manner, DOE is consolidating its evaluation of potential
energy conservation standards for battery chargers and external power
supplies together in a single rulemaking proceeding. Additional details
related to the authority and background of this rulemaking can be found
in section I of the NOPR. 75 FR 16958, 16959-16960.
II. Summary of the Final Rule
Today's final rule does two key things. First, it adopts new test
procedures for the active mode of battery chargers and all modes of
multiple-voltage external power supplies. Second, it modifies existing
parts of the battery charger and external power supply test procedures
(for example, the duration of the battery charger standby and off mode
tests). In doing so, it amends both appendices Y and Z in multiple
places. Furthermore, although DOE is retaining the current language of
certain sections of appendices Y and Z, in selecting amendments for
inclusion in today's final rule, DOE considered all aspects of the
existing battery charger and external power supply test procedures. By
examining these procedures in this comprehensive manner, this
rulemaking satisfies the 7-year review requirement of 42 U.S.C.
6293(b). Subsequent amendments will, as needed, be made in a manner
consistent with the schedule set out in that provision.
As explained in greater detail in this notice, the final rule makes
the following specific changes to the current regulations:
(1) Inserts a new test procedure to measure the energy consumption
of battery chargers in active mode to assist in the development of
energy conservation standards;
(2) Amends the battery charger test procedure to decrease the
testing time of battery chargers in standby and off modes;
(3) Amends the single-voltage external power supply test procedure
to accommodate external power supplies with Universal Serial Bus (USB)
outputs and other types of external power supplies that cannot be
tested in accordance with the current test procedure; and
(4) Inserts a new test procedure for multiple-voltage external
power supplies, a type of non-Class A external power supply that DOE
evaluated in its non-Class A determination analysis and that will be
covered under the energy conservation standard.
Table II.1 lists the sections of 10 CFR part 430 affected by the
amendments in this rule. The left-hand column in the table cites the
locations of the affected CFR provisions, while the right-hand column
lists the changes.
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Table II.1--Summary of Proposed Changes and Affected Sections of 10 CFR
Part 430
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Existing Section in 10 CFR Part 430 Summary of modifications
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Section 430.23 of Subpart B--Test Modify `(aa) battery
procedures for the measurement of charger' to include energy
energy and water consumption. consumption in active mode.
Appendix Y to Subpart B of Part 430-- Renumber the existing
Uniform Test Method for Measuring the sections to ease referencing
Energy Consumption of Battery Chargers. and use by testing
technicians.
1. Scope........................... Limit scope to include
only battery chargers intended
for operation in the United
States.
2. Definitions..................... Add definitions for:
[cir] Active power or real
power (P).
[cir] Ambient temperature.
[cir] Apparent power (S).
[cir] Batch charger.
[cir] Battery rest period.
[cir] C-rate.
[cir] Equalization.
[cir] Instructions or
manufacturer's
instructions.
[cir] Measured charge
capacity.
[cir] Rated battery voltage.
[cir] Rated charge capacity.
[cir] Rated energy capacity.
[cir] Total harmonic
distortion (THD).
[cir] Unit under test (UUT).
Remove definitions
for:
[cir] Accumulated nonactive
energy.
[cir] Energy ratio or
nonactive energy ratio.
Modify definitions
for:
[cir] Active mode.
[cir] Multi-port charger.
[cir] Multi-voltage [agrave]
la carte charger.
[cir] Standby mode.
3. Test Apparatus and General Insert apparatus and
Instructions. instructions to measure energy
consumption in active mode.
4. Test Measurement................ Insert procedures to
measure energy consumption in
active mode.
Modify 4(c) to change
standby mode measurement time.
Modify 4(d) to change
off mode measurement time.
Appendix Z to Subpart B of Part 430--
Uniform Test Method for Measuring the
Energy Consumption of External Power
Supplies.
1. Scope........................... No change.
2. Definitions..................... Modify definition of
active power.
3. Test Apparatus and General Modify 3(b) to
Instructions. accommodate multiple-voltage
external power supplies.
4. Test Measurement................ Modify 4(a) to
accommodate external power
supplies that communicate with
the load, perform current
limiting, or have output power
greater than 250 watts.
Modify 4(b) to
accommodate multiple-voltage
external power supplies.
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In developing today's amendments, DOE considered comments received
from interested parties in response to the standby and off mode test
procedure, framework document, NOPR, and NOPR public meeting. Although
a part of the standards rulemaking, DOE also considered comments to the
framework document insofar as these comments had any bearing with
respect to test procedure-related items. Numerous commenters sought to
have DOE require testing in additional modes of operation in which
products had not been tested under the current procedure, such as
active or charge mode. DOE reviewed the existing test procedures for
battery chargers and external power supplies and found that, with some
modifications, they could be used as a basis for updating DOE's test
procedures to address some of the limitations identified by commenters.
These modifications are discussed in greater detail below.
Interested parties who commented on the NOPR consisted of
manufacturers (Associate of Home Appliance Manufacturers (AHAM), Power
Tool Institute (PTI), Euro-Pro, Phillips, Sony Electronics, Inc.,
Delta-Q Technologies Corp. and Wahl Clipper); an energy efficiency
advocate (Appliance Standards Awareness Project (ASAP)); and utility
companies (Pacific Gas and Electric (PG&E) and Southern California
Edison).
DOE also examined whether the amendments to its test procedures
would significantly change the measured energy consumption or
efficiency of battery chargers or external power supplies. This
question is particularly important for Class A external power supplies,
which are subject to the EISA minimum efficiency standard that took
effect on July 1, 2008. (42 U.S.C. 6295(u)(3)(A))
The amendments to the single-voltage external power supply test
procedure, which is used to test compliance with Class A external power
supply standards, affect the measured efficiency of external power
supplies with USB outputs and external power supplies that communicate
with their loads--which together comprise the subset of Class A
external power supplies to which these amendments would apply. The term
``communicating'' with a load refers to an external power supply's
ability to identify or otherwise exchange
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information with its load (i.e., the end-use product to which it is
connected). This technique is used to tailor the operation of the
external power supply to the needs of the load as well as to prevent
the possibility of the supply being used with incompatible loads, which
could damage the product. While most external power supplies provide
power at a fixed output voltage regardless of what load is connected to
their outputs, some external power supplies will only provide power
once they have ``communicated'' with the load and identified it as the
intended load.
The remaining amendments included in today's final rule have the
following impacts on measured energy consumption or efficiency:
(1) The battery charger active mode test procedure amendment
changes the measured energy consumption of battery chargers by
eliminating the nonactive energy ratio metric and replacing it with a
new metric that measures energy consumption in active mode;
(2) The standby and off mode test procedure amendment changes the
measured energy consumption of battery chargers or external power
supplies when operating in these modes; and
(3) The multiple-voltage external power supply amendment inserts a
new test procedure for these products.
The procedure being adopted today will be used to help DOE in
establishing the energy conservation standards for these products
through a separate rulemaking that is currently underway.
A. Battery Charger Active Mode Test Procedure
Prior to this final rule, the DOE battery charger test procedure,
first created by the EPACT 2005 En Masse final rule (71 FR 71340
(December 8, 2006)) and amended by the standby and off mode test
procedure final rule (74 FR 13318 (March 27, 2009)), did not measure
battery charger energy consumption in all modes. Instead, it excluded
the energy consumed by the battery charger while charging a battery
(i.e. active mode energy consumption). The procedure measured energy
consumption only in standby (or no battery) and off modes (i.e.
inactive mode energy consumption). DOE had adopted this earlier
approach because the timing of the rulemaking did not permit an
addition of an active mode test procedure at that time. 71 FR 71340,
71360.
The battery charger active mode test procedure in today's final
rule removes the inactive mode calculation. This calculation, found in
section 4(a) of appendix Y, is a composite of different operational
modes that, under the changes introduced by today's final rule, are to
be measured separately.
The final rule also makes three additional key changes to the
battery charger test procedure. First, it adds an active mode
measurement to section 4(b) to account for the energy consumed by a
battery charger while it is charging a battery. Second, it amends the
scope, definitions, and test apparatus and general instructions
(sections 1, 2, and 3) to address the changes brought about by the
introduction of the new active mode test procedure. Third, it
reorganizes the battery charger sections to enhance their readability
and ease of use to help reduce the prospect of differing
interpretations while conducting the test.
The active mode amendment that DOE is adopting today is based in
large part on the battery charger system test procedure already adopted
by the California Energy Commission (CEC).\2\ DOE, however, has
modified that procedure to help decrease the overall testing burden
faced by manufacturers when testing these products and by increasing
the procedure's clarity. Examples of how DOE has accomplished these
goals include modifying the procedure to use terms consistent with
other DOE rulemakings and dividing more complex procedures into
simpler, discrete steps for testing technicians to follow. These
changes are discussed further in section III.B.
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\2\ Ecos Consulting, Electric Power Research Institute (EPRI)
Solutions, Southern California Edison (SCE). Energy Efficiency
Battery Charger System Test Procedure. Version 2.2. November 12,
2008. http://www.energy.ca.gov/appliances/2008rulemaking/2008-AAER-1B/2008-11-19_BATTERY_CHARGER_SYSTEM_TEST_PROCEDURE.PDF.
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B. Review of Battery Charger and External Power Supply Standby Mode and
Off Mode Test Procedures
DOE addressed the EPCA requirements to prescribe definitions and
test procedures for measuring the energy consumption of external power
supplies and battery chargers in standby and off modes (42 U.S.C.
6298(gg)(A) and (B)) in its March 27, 2009, test procedure final rule.
That final rule incorporated standby and off mode measurements as well
as updated definitions into appendices Y and Z. 74 FR 13318.
In today's final rule, DOE amends the battery charger test
procedure by requiring the use of a 30-minute warm-up period followed
by a 10-minute measurement period. Previously, the DOE test procedure
required a 1-hour measurement period. This amendment harmonizes DOE's
standby and off mode measurement requirement for battery chargers with
the requirement contained in section IV of part 1 of the CEC battery
charger test procedure. DOE is harmonizing its procedure with the CEC
battery charger test procedure to produce a less burdensome procedure
while preserving testing accuracy. No changes are being made to the
standby and off mode test procedures for external power supplies.
Detailed discussion of the changes can be found in section III.C.
C. Review of Single-Voltage External Power Supply Test Procedure
DOE is amending the test procedure for single-voltage external
power supplies to accommodate several classes of external power
supplies that cannot be tested in a representative or repeatable manner
under the current test procedure. These external power supplies include
those devices that (1) communicate with their loads through USB and
other protocols (e.g. I2C and TCP/IP),\3\ (2) limit their output
current below the maximum current listed on their nameplates, and (3)
have output power in excess of 250 watts. In its NOPR, DOE presented a
general outline for a possible test method for these products, but
stated that because these types of external power supplies did not
exist in significant numbers in the market, DOE was unable to analyze
them in depth and develop a testing approach using the single-voltage
external power supply procedure. 75 FR 16958, 16962. DOE received
generally supportive comments on its proposals for dealing with the
three different external power supply types, especially those proposals
regarding external power supplies that communicate with their loads.
The test procedure revisions adopted in this final rule are described
in greater detail in section III.D.
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\3\ Devices of this type include cellular telephones and
portable media players such as MP3 players.
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D. Multiple-Voltage External Power Supply Test Procedure
Pursuant to 42 U.S.C. 6295(u)(1)(E)(i)(I), DOE performed a
determination analysis and concluded that those external power supplies
equipped with multiple simultaneous output voltages were appropriate
candidates for separate energy conservation standards. 75 FR 16958,
16974. Because DOE was unaware of any procedure that could be used to
measure the energy consumption of these devices, DOE sought to develop
such a procedure by modifying the
[[Page 31754]]
procedures currently used by the CEC when measuring the energy
consumption of single-voltage external power supplies \4\ and internal
power supplies.\5\ 73 FR 48054, 48058 (August 15, 2008). DOE looked to
the CEC's test procedure as the starting point for creating a multiple
voltage external power supply procedure because of the aforementioned
positive determination. DOE also believed that the CEC test procedure
was the most accurate and appropriate of all the test procedures it
examined and that adopting the CEC test procedure would allow DOE to
maintain consistency with DOE's single-voltage external power supply
test procedure, which was also based on a CEC test procedure. DOE's 73
FR 48064.
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\4\ Calwell, C., Foster, S., and Reeder, T. Test Method for
Calculating the Energy Efficiency of Single-Voltage External Ac-Dc
and Ac-Ac Power Supplies, August 11, 2004, previously incorporated
by reference into appendix Y. Ecos Consulting for the California
Energy Commission; Sacramento, CA. http://www.energystar.gov/ia/partners/prod_development/downloads/power_supplies/EPSupplyEffic_TestMethod_0804.pdf.
\5\ Mansoor, A., et al. and May-Ostendorp, P., et al.
Generalized Test Protocol for Calculating the Energy Efficiency of
Internal Ac-Dc Power Supplies, Rev. 6.4.3. October 22, 2009. EPRI
and Ecos Consulting for the California Energy Commission;
Sacramento, CA. http://efficientpowersupplies.epri.com/pages/Latest_Protocol/Generalized_Internal_Power_Supply_Efficiency_Test_Protocol_R6.4.3.pdf.
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In today's final rule, DOE is adopting a test procedure generally
consistent with both its earlier approach from its August 2008 proposal
to address multiple-voltage external power supplies within the context
of its standby mode test procedure and its more recent proposal. See 73
FR 48054, 48064 and 75 FR 16958, 16974. Although DOE had initially
considered the adoption of a multiple-voltage external power supply
procedure as part of its August 2008 NOPR, it declined to include such
a procedure in the March 2009 final rule because of the substantial
number of issues raised by commenters and the limited time provided by
EISA 2007 to fully consider all of these concerns. 74 FR 13322. These
concerns have since been resolved in light of additional comments,
data, and information developed as part of today's final rule.
Incorporating this amendment into the external power supply test
procedure will enable DOE to evaluate power consumption for multiple-
voltage external power supplies in all modes of operation: active,
standby (or no-load), and off. A detailed discussion of DOE's test
procedure for multiple-voltage external power supplies can be found in
section III.E.
III. Discussion
Commenters raised a variety of issues related to DOE's proposal.
These issues are addressed in greater detail in the sections that
follow.
A. Effective Date for the Amended Test Procedures
The April 2010 proposal provided for an effective date of 30 days
after publication of the final rule. That notice also indicated that
the amendments to the battery charger and non-Class A external power
supply test procedures would be required to be used once DOE sets
standards for these particular products. 75 FR 16958, 16963.
Commenters voiced concerns with the 30-day effective date set forth
in the test procedure NOPR. AHAM and PTI specifically asked for
clarification on the language regarding the effective date. (AHAM, Pub.
Mtg. Tran., No. 2 at p. 220; PTI, Pub. Mtg. Tran., No. 2 at p. 236)
AHAM specifically voiced that clarification is important to prevent the
need for relabeling products and avoiding possible conflicts with
applicable State and ENERGY STAR specifications. (AHAM, Pub. Mtg.
Tran., No. 2 at p. 223)
In addition to clarity, commenters requested more time to comply.
Euro-Pro commented that it is difficult to re-label products, update
all associated paperwork and advertisements, and sell the product in
the marketplace within 30 days. (Euro-Pro, Pub. Mtg. Tran., No. 2 at p.
224) Euro-Pro further commented that it is difficult to comply with the
new test procedure, whether given 30 or 180 days, and that DOE should
provide a calendar date by which the procedure would go into effect.
(Euro-Pro, Pub. Mtg. Tran., No. 2 at p. 233) Finally, AHAM urged DOE to
make the test procedure effective, including the ENERGY STAR test
procedure, when the standard becomes effective, to avoid confusion and
issues with non-conformance. (AHAM, No. 10 at p. 4)
Commenters indicated that providing a lead time of 30 days would be
insufficient to transition to a new test procedure. DOE notes that, any
representations of energy use or efficiency made by a manufacturer must
be based on the test procedure established by DOE. Manufacturers have
180 days from the establishment of that procedure to ensure that any
such representations are based on that DOE-established test procedure.
42 U.S.C. 6293(c)(2)
Currently, there are no energy conservation standards for battery
chargers and non-Class A external power supplies. To clarify the timing
of the test procedure requirements that DOE is adopting today, DOE is
amending the regulatory text to address this issue. Because of the 180-
day requirement, as a practical matter, manufacturers have a full six
months to adjust to the new procedure before having to make
representations based on that procedure. Manufacturers would need to
use the new procedure for battery chargers and non-Class A external
power supplies once the this date for making representations is
reached. Any written representations, such as those prescribed by the
Federal Trade Commission in accordance with 42 U.S.C. 6294, would need
to be made consistent with the test procedure as amended by today's
final rule. Accordingly, although today's rule becomes effective 30
days after publication in the Federal Register, manufacturers have 180
days from the publication of today's final rule to use the test
procedure for any written representation of energy efficiency or use.
And since such requirements are not likely to be established until
after DOE sets energy efficiency standards for these products in mid-
to-late 2011, manufacturers will have considerable time to adjust to
the new procedure before they are required to use this procedure to
certify compliance with those new standards. (Given that today's rule
does not prescribe any substantive changes that would affect the
measured energy efficiency or use of Class A external power supplies,
DOE does not anticipate any difficulties for manufacturers who are
certifying these products.)
Finally, interested parties asked DOE to clarify how products that
cannot be tested can be sold in the United States. (ASAP, No. 11 at p.
12; SCE, No. 13 at p. 12; PG&E, No. 12 at p. 12) They commented that
DOE should disallow the sale of products that cannot be tested by the
test procedure, but wanted to ensure that a product that must be tested
under the procedure does not provide a path for manufacturers to avoid
the energy conservation standard requirements. (ASAP, No. 11 at p. 12;
SCE, No. 13 at p. 12; PG&E, No. 12 at p. 12) DOE acknowledges the
interested parties' concerns and clarifies that, in general, products
that cannot be tested in accordance with the DOE test procedure will
not be permitted to be sold in the United States. However, a process is
available to permit manufacturer to seek a waiver from the test
procedure in special circumstances. As part of this process, an
alternative test procedure must be provided by the manufacturer seeking
the waiver in
[[Page 31755]]
order to provide a means to measure the energy use or efficiency of
that product. See 10 CFR 431.27 (detailing requirements for obtaining a
waiver from the required test procedure).
B. Battery Charger Active Mode Test Procedure
Prior to today's final rule, the battery charger test procedure
consisted of four parts: (1) Scope, (2) definitions, (3) test apparatus
and general instructions, and (4) test measurement. The test
measurement section included four subparts to address the measurement
of four separate energy consumption modes--inactive mode,\6\ active
mode, standby mode, and off-mode. Inactive mode energy consumption is
measured for purposes of evaluating battery charger performance under
the voluntary ENERGY STAR testing program.\7\
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\6\ The inactive mode energy consumption measurement consists of
the energy measured over 36 hours while the battery charger is in
maintenance mode, followed by 12 hours in standby (no-battery) mode,
with the possibility of abbreviating the measurement to 6 hours and
1 hour, respectively under certain conditions.
\7\ Environmental Protection Agency (EPA). Test Methodology for
Determining the Energy Performance of Battery Charging Systems.
December 2005. Washington, DC. http://www.energystar.gov/ia/partners/prod_development/downloads/Battery_Chargers_Test_Method.pdf.
---------------------------------------------------------------------------
During the standby and off mode test procedure rulemaking from
2008, numerous interested parties commented that the current DOE test
procedure is insufficient for the development of energy conservation
standards because it does not measure energy consumption during active
(i.e., charging) mode. Many of these interested parties also
recommended that DOE adopt the optional battery charger test procedure
then under consideration in draft form at the CEC. As mentioned in the
standby and off mode test procedure final rule, 74 FR 13318, DOE was
unable to act on these comments, as it had not contemplated the
inclusion of any active mode changes in the standby and off mode test
procedure NOPR and there was insufficient time to consider this option
in light of the statutory deadline for that rulemaking. 73 FR 48054
(August 15, 2008).
1. Incorporation of the CEC Test Procedure
On December 3, 2008, CEC adopted version 2.2 of the test procedure
developed by Ecos Consulting, EPRI Solutions, and Southern California
Edison (SCE), as an optional test procedure for the measurement of
battery charger energy consumption during charging (active),
maintenance, no-battery (standby), and off modes. The test procedure
was incorporated by reference into section 1604(w) of title 20 of the
California Code of Regulations,\8\ alongside the DOE test procedure
from appendix Y. Details of the CEC test procedure can be found in
section III.1 of the NOPR. 75 FR 16964. See also 20 Cal. Code 1604(w)
(referring to the 2008 DOE test procedure and the California test
method for battery chargers).
---------------------------------------------------------------------------
\8\ California Energy Commission (CEC), ``2009 Appliance
Efficiency Regulations,'' August 2009.
---------------------------------------------------------------------------
In both the framework document and NOPR, DOE stated its intention
to amend the battery charger test procedure in appendix Y to include an
active mode measurement. See 74 FR 26818 and 75 FR 16958. Commenters
supported the active mode measurement, and encouraged DOE to adopt the
CEC test procedure in this regard. At the NOPR public meeting and in
written comments, AHAM generally supported the proposed test procedure
based on the CEC procedure and noted that its inclusion of an active
mode energy measurement made it an improvement over the procedure
already in place. (AHAM, Pub. Mtg. Tran., No. 2 at p. 25; No. 10 at p.
2) AHAM further commented that the CEC test procedure provides a good
method for testing active mode. (AHAM, Pub. Mtg. Tran., No. 2 at pp.
65-66) PTI agreed with DOE's decision to incorporate elements from the
CEC test procedure into the NOPR. (PTI, Pub. Mtg. Tran., No. 2 at pp.
249-250) PG&E was supportive of DOE adopting an active mode that
largely follows the CEC test procedure because that procedure, in
PG&E's view, is a solid base for performing battery charger testing.
(PG&E, Pub. Mtg. Tran., No. 2 at p. 14) PG&E, Delta-Q and AHAM also
supported DOE's decision to drop the inactive mode procedure in favor
of an active mode one. (PG&E, Pub. Mtg. Tran., No. 2 at pp. 51-52;
AHAM, Pub. Mtg. Tran., No. 2 at p. 47; Delta-Q, No. 5 at p. 2)
As described in section III.B of the NOPR, DOE examined three other
procedures that are used world-wide to measure battery charger energy
consumption--the EPA-developed procedure used for ENERGY STAR-
qualification, Canadian Standards Association (CSA) C381.2, and the CEC
test procedure on which DOE based its proposal. 75 FR 16964. After
examining these procedures and conducting tests using them, DOE decided
that the CEC test procedure provided all of the necessary outputs with
reasonably good accuracy and minimal variability. The EPA-developed
procedure and the CSA test procedure both lacked a method for measuring
active mode energy consumption, a measurement that DOE and interested
parties believe is necessary to establish meaningful energy
conservation standards. Therefore, for these reasons, and in light of
the general support that interested parties gave to the prospect of
incorporating a CEC-based test procedure, DOE is basing its battery
charger test procedure on the methodology of the CEC procedure but with
some modifications to help increase its clarity and repeatability, and
minimize the testing burden. (Battery Charger Test Data, No. 18.3)
These modifications are outlined in the following sections.
2. Scope
a. Battery Chargers Versus External Power Supplies
As discussed in the NOPR, the battery charger test procedure
applies to: ``battery chargers operating at either DC or United States
AC line voltage (120V at 60Hz).'' 75 FR 16958, 16979. In written and
verbal comments, interested parties noted that the proposed battery
charger test procedure did not clearly explain how DOE would
distinguish a battery charger from an external power supply for
purposes of testing requirements.
AHAM expressed numerous concerns regarding the proposal's scope. In
its view, the procedure should have a scope that clearly outlines what
the test procedure covers. (AHAM, Pub. Mtg. Tran., No. 2 at p. 42) AHAM
also asserted that any differences between the scope of coverage of the
DOE and CEC test procedures stemming from the treatment of the battery
charger's wall adapter (i.e., whether it is tested separately as an
external power supply or as part of the battery charger) may cause
problems once the DOE test procedure for battery chargers becomes
effective. Manufacturers may not know which procedure to use with their
particular product since the DOE and CEC definitions of battery
chargers and external power supplies differ. As a result, in its view,
manufacturers will be unsure how to test and label their products.
(AHAM, Pub. Mtg. Tran., No. 2 at p. 228) As an example, AHAM argued
that non-Class A, motor-operated or detachable battery external power
supplies that use charge control circuitry should be viewed as part of
a battery charging system and be tested as part of the overall battery
charger. (AHAM, Pub. Mtg. Tran., No. 2 at p. 37) It also suggested that
to avoid confusion and allow for greater accuracy, DOE
[[Page 31756]]
should specify that the battery charger test procedure should be the
only test procedure used to test battery chargers and all parts of
battery chargers.
DOE notes that the approach suggested by AHAM would eliminate the
possibility of regulating external power supplies packaged with battery
chargers under the external power supplies standard. (AHAM, No. 10 at
p. 4) This approach, however, also contains some inherent problems.
Because an external power supply can provide power to one or more parts
of an application simultaneously, limiting the procedure in the manner
suggested by AHAM would similarly limit DOE's ability to capture
certain aspects of the energy consumption characteristics of these
products. For certain products, such as a power tool, the external
power supply might only provide power to the battery charger. However,
for products such as laptops, the external power supply might
simultaneously provide power to the battery charger and other
functions, such as the screen and processor. If DOE were to follow
AHAM's suggestion, it would be unable to capture the potential energy
savings from the external power supply to parts of an application other
than the battery charger.
AHAM also stated that it is difficult to comment on the test
procedure without knowing how energy standards will apply to these
products and believed it would be inappropriate to separate the testing
of any portions of the battery recharging circuit as part of the test
procedure. (AHAM, No. 10 at p. 2)
Separately, AHAM asserted that, in its view, DOE has not clearly
explained how the battery charger test procedure schedule integrates
with the test procedure for Class A or non-Class A external power
supply devices, or any combination thereof. (AHAM, Pub. Mtg. Tran., No.
2 at p. 27) AHAM also stated that manufacturers are currently
``required to report their energy usage to California to indicate by a
Roman numeral (`IV' or `V') the level of external power supply that the
wall adapter may utilize.'' In its view, DOE has not yet clarified how
a wall adapter would be treated--i.e., as a separate and distinct Non-
Class-A external power supply or as part of a battery charger--
manufacturers would not know which energy conservation standard would
apply. (AHAM, No. 10 at p. 4) Finally, AHAM commented that as a result
of a recent memorandum of understanding (MOU) reached between DOE and
EPA, ENERGY STAR may be obligated to use the DOE test procedure if it
is available. (AHAM, Pub. Mtg. Tran., No. 2 at p. 236) \9\
---------------------------------------------------------------------------
\9\ 2009 EPA-DOE Memorandum of Understanding: http://www.energystar.gov/index.cfm?c=partners.mou.
---------------------------------------------------------------------------
Wahl recommended that DOE should have one test procedure and
regulation for an individual product. Products should be classified as
an external power supply or as a battery charger and regulated to one
standard or the other but not both. (Wahl Clipper, No. 9, at p. 1)
DOE acknowledges that interested parties have a number of concerns
about the scope of the battery charger test procedure. DOE will address
these issues and explain its approach in greater detail concerning how
to delineate which products are battery chargers and which are external
power supplies in the standards rulemaking.
b. Input Voltage and Frequency
As proposed in the NOPR, the scope of the DOE test procedure
encompasses products that use DC or AC input voltages of 115 volts (V)
at 60 hertz (Hz). 75 FR 16958, 16965. This scope differs from that of
the CEC test procedure, which requires, when possible, the testing of
units that accept AC line-voltage input at two voltage and frequency
combinations: 115 V at 60 Hz and 230 V at 50 Hz. At the NOPR public
meeting, commenters expressed different opinions concerning the
rulemaking's scope.
Delta-Q, AHAM, and Sony believed that the scope should be limited
to cover only products that use DC or AC 115 V at 60 Hz. (Delta-Q, No.
5 at p. 1; Sony, No. 6 at p. 1; AHAM, No. 10 at p. 8) Delta-Q cautioned
``against some overlap with any solar industry standards that may apply
to battery chargers operating with DC input.'' (Delta-Q, No. 5 at p. 1)
Sony further supported DOE's proposal by stating that limiting testing
to a single input voltage would reduce test costs and time and would be
consistent with the external power supply test procedure. (Sony, No. 6
at p. 2)
Alternatively, ASAP, PG&E and SCE encouraged DOE to allow for input
voltages higher than 115 V, such as 230 V at 60 Hz, because there are
some high-power consumer battery chargers that operate at 230 to 240 V
at 60 Hz. These chargers include charger/inverter units that connect
between the electrical grid and the battery of many consumer
photovoltaic (PV) and wind energy systems, as well as rapid chargers
for lead acid batteries. (ASAP, No. 11 at pp. 1-2; PG&E, No. 12 at pp.
1-2; SCE, No. 13 at pp. 1-2) These commenters indicated that power at
230 V is available in most U.S. households, and products that use this
higher voltage may become more prevalent as the Federal government
provides tax incentives for residential PV systems that employ these
higher output voltage devices. (ASAP, No. 11 at p. 2; PG&E, No. 12 at
p. 2; SCE, No. 13 at p. 2) To account for testing at either input
voltage and frequency combination, ASAP, PG&E, and SCE urged DOE to
adopt language indicating that if the unit under test (UUT) is intended
(i.e., designed) for operation on AC line voltage-input of 110 V to 125
V 60 Hz, it shall be tested at 115 V at 60 Hz. Similarly, these
commenters added that if the UUT is not intended for operation at 110 V
to 125 V at 60 Hz, but is intended for operation at 220 to 240 V at 60
Hz, it should be tested at 230 V at 60 Hz. In the case of a UUT that is
designed for operation on AC line-voltage input but cannot be operated
at either of these voltages, this unit should not be tested under the
procedure. See generally, ASAP, No. 11 at p. 2; PG&E, No. 12 at p. 2;
SCE, No. 13 at p. 2.
Further, these commenters argued that when testing products of the
same voltage at both 50 and 60 Hz, switch mode power supplies showed
negligible difference in power consumption, and products with line-
frequency transformers showed higher power consumption at 50 Hz. (ASAP,
No. 11 at p. 2; PG&E, No. 12 at p. 2; SCE, No. 13 at p. 2) In their
view, if DOE included higher voltage products in its scope, DOE could
assume that if a product tested at 230 V at 50 Hz demonstrates
compliance, it would also comply at 230 V at 60 Hz because at 50 Hz, it
would be, presumably, consuming more power. Therefore, DOE could accept
a test result at 230 V at 50 Hz as a substitute for 230 V at 60 Hz.
(ASAP, No. 11 at p. 2; PG&E, No. 12 at p. 2; SCE, No. 13 at p. 2)
However, these commenters provided no data in support of these claims.
Although some interested parties were concerned with the scope of
the battery charger test procedure, DOE is retaining the scope as it
was presented in its NOPR. DOE acknowledges that consumer products
operate at different voltage and frequency combinations. However, DOE
has not encountered consumer products that operate only at input
voltages other than 115 V throughout this rulemaking process.
Commenters provided no evidence of such products being available. For
this reason, DOE believes that, to the extent that any such products
exist, these products comprise, at most, an extremely small portion of
the battery
[[Page 31757]]
charger market. Consequently, DOE has decided at this time not to
require the use of a separate voltage in addition to 115 V. DOE does
not anticipate that its decision to exclude them from this rulemaking
will have a significant impact on the annual energy consumption of
battery chargers as a whole. However, DOE may revisit this decision in
subsequent rulemakings.
c. DC Input Battery Chargers
In this rulemaking, DOE covers both AC- (as discussed, above) and
DC-input battery chargers. In its comments, AHAM questioned whether DOE
has the authority to regulate DC-input battery chargers, particularly
within the context of those devices that have automotive-related
applications--and how the proposed regulation of such products relates
to the need for reducing power demanded from utilities. (AHAM, No. 10
at p. 5) AHAM added that if this approach relates to battery charging
energy consumption from other electronics sources (i.e. charging a cell
phone from a laptop computer), it suggested that DOE explain how it
will segregate the energy from the functions of the laptop to the
battery charger. (AHAM, No. 10 at p. 5) AHAM also stated that DOE
should not focus on DC input battery chargers, but rather focus only on
non-Class A power supplies and AC input battery chargers. (AHAM, No. 10
at p. 5)
Additionally, in response to the preliminary analysis for the
corresponding battery charger and external power supply energy
conservation standards rulemaking, DOE received other comments
regarding in-vehicle chargers.\10\ CEA and Motorola both stated that
DOE's test procedure should clarify its stance regarding in-vehicle
chargers while also recommending that such chargers be dropped from the
scope of coverage for both the test procedure and the energy
conservation standards rulemakings. (CEA, No. 48 at p. 3 and Motorola,
No. 50 at pp. 2-3) Motorola commented that the CEC test procedure does
not have a clear stance for in-vehicle electronics because the stated
scope of the test procedure excludes battery chargers that do not
connect to the utility grid, yet there are stipulations for testing
devices that connect to cigarette outlets in automotive equipment and
USB ports. (Motorola, No. 50 at pp. 2-3). CEA commented that the
``stated scope of the DOE test procedure clearly excludes in-vehicle
`DC-in, DC-out' battery charging systems which are not connected to the
utility grid. However, there are instructions in the test method for
testing these types of battery charging systems.'' (CEA, No. 48 at p.
3)
---------------------------------------------------------------------------
\10\ The comments listed in this paragraph come from
administrative record for the parallel rulemaking on energy
conservation standards for battery chargers and external power
supplies. The reference docket number is EERE-2008-BT-STD-0005 (RIN:
1904-AB57).
---------------------------------------------------------------------------
Under EPCA, DOE has the authority to cover a wide variety of
consumer products, excluding those consumer products ``designed solely
for use in recreational vehicles and other mobile equipment''. 42
U.S.C. 6292(a). In DOE's view, this exclusion does not apply to any of
the DC-input devices that would likely be affected by the procedure
being promulgated today. While some of these products may be designed
to work in conjunction with certain mobile equipment, such as for the
purpose of recharging the battery of a golf car, DOE has found that
none of the products that were considered within the context of this
rulemaking--or of any related standards rulemaking activities--involved
products that were designed solely for use in recreational vehicles and
other mobile equipment. For example, cell phone chargers that work with
DC current (as would be available in a recreational vehicle) also come
equipped (or are designed to work) with wall adapters. As a result,
such devices are not ``designed solely'' for use in a recreational
vehicle and other mobile equipment.
However, as a result of the aforementioned provision, DOE is
modifying its procedure for determining how a product should be tested.
If a manufacturer packages its product with a wall adapter or the
manufacturer recommends or sells a wall adapter for use with its
product, the battery charger shall be tested with that wall adapter. If
this is not the case and the product, such as a GPS device, only works
with a DC input through either a car charger or a USB port, that device
will be tested with the 5 V DC input that corresponds to the USB port
configuration.
Consistent with this view, DOE plans to proceed with the scope
proposed in the NOPR, which includes testing DC-input battery chargers.
While EPCA specifies the input voltage that applies to an external
power supply as part of that product's statutory definition, it does
not place similar limitations with respect to the input voltage of
battery chargers that DOE may regulate. Further, while many DC-input
battery chargers may be designed to work with a recreational vehicle or
other mobile equipment, these chargers are not ``designed solely for
use'' in these applications since many, if not all, of these chargers
are designed to work in conjunction with wall adapters, USB ports, or
through other electrical connections to obtain AC mains power. In light
of the absence of any specific language that would otherwise prevent
DOE from regulating battery chargers that operate with a DC-input, and
the fact that these devices are not designed exclusively for use in
recreational vehicles or other mobile equipment, DOE believes it has
the authority to regulate such products. Whether DOE opts to regulate
these products is a decision based on whether energy conservation
standards for these products achieve the maximum energy savings, are
technologically feasible, and are economically justified. See 42 U.S.C.
6295(o)(2). As part of the energy conservation standards setting
process, DOE plans to separately evaluate those DC-input battery
chargers and determine whether it is technically and economically
feasible to set standards for them in a manner consistent with the
applicable statutory requirements.
d. High-Power Battery Chargers
DOE sought comment on how it should address the treatment of high-
power battery chargers. In comments, Delta-Q expressed concern with the
approach contained in the current version of appendix Y, which tests
all battery chargers in the same manner, irrespective of the amount of
power they use. Delta-Q stated that they are very concerned about how
the test procedure would measure the energy use of higher power (750-
1500W) chargers on larger (>200Ah) batteries, because the potential
variability in the batteries is greater than in smaller batteries. This
greater variability can impact the entire system and the calculated
energy efficiency. To address this issue, Delta-Q suggested the use of
an electronic load to simulate a battery pack, a standard battery make/
model with a certain age range or excluding batteries above a certain
size from the test procedure (Delta-Q, No. 5 at p. 1).
As proposed in the NOPR, today's final rule specifies that both the
battery charger and its battery shall be new products of the type and
condition that would be sold to a customer (i.e. end-user). 75 FR
16958, 16981. DOE is aware of the potential benefit that exists from
using a battery simulator and testing with an electronic load, namely,
decreased variability in test results for large lead-acid batteries.
However, DOE is unaware of any existing test procedures that rely on
this particular method, but is aware of test procedures for battery
chargers that require testing with the physical batteries that are
associated with the charger being tested. The fact that there are no
currently
[[Page 31758]]
recognized standard test procedures that rely on simulators suggests
that testing with physical batteries rather than simulators is not only
preferable but an appropriate and acceptable means to accurately test
battery chargers, including those products that charge extremely large
batteries (i.e. those used in forklifts or golf cars).
Additionally, because DOE is unaware of test procedures that use
battery simulators, DOE would need to develop such procedures on its
own, which would require considerably more testing and analysis and
potentially involve additional uncertainty given the absence of any
currently existing protocols. Potential concerns include determining
how such a device would be used in a test procedure and how
representative such a device would be of an actual battery, as well as
other considerations, all of which would need to be vetted publicly.
DOE is confident that today's final rule will result in repeatable test
results for all battery chargers, including those that use large
batteries, because of the requirements that are being added when
selecting a battery to test and from DOE's experience testing various
battery chargers. (Battery Charger Test Data, No. 18.3) As a result,
the procedure will permit performance comparisons across all battery
charger types with respect to energy usage. Upon the receipt of further
information, DOE may consider using a battery simulator in a future
revision to the test procedure. In the absence of this information,
however, DOE is opting to incorporate its proposed method into the
battery charger test procedure--i.e. specifying that high-powered
battery chargers be tested using the same method as used to test all
battery chargers; that is, by using the associated battery.
e. Consumer Motive Equipment
The CEC test procedure includes two parts: part 1 covers the energy
consumption of consumer products with input power under 2 kilowatts,
whereas part 2 covers the energy consumption of larger industrial
chargers, which are generally larger in size and capacity. Briefly,
part 1 measures the input energy to the battery charger when recharging
a battery that had previously been conditioned (if necessary). Part 2
requires this same measurement but includes charger output energy
measurements and tests the charger with the battery at three different
depths-of-discharge. The NOPR provided a more detailed discussion of
these parts. See 75 FR 16958, 16964-66 (section III.B.1 and section
III.B.2).
DOE proposed testing all battery chargers, including large battery
chargers for golf cars and other consumer motive equipment, according
to part 1 of the CEC test procedure. PG&E, ASAP, and SCE agreed with
DOE's approach for testing the battery chargers used with golf cars and
other consumer motive equipment. (ASAP, No. 11 at p. 2; PG&E, No. 12 at
p. 2; SCE, No. 13 at p. 2) PG&E informed DOE that golf cars can be
satisfactorily tested under either part 1 or part 2 of the CEC test
procedure. (PG&E, Pub. Mtg. Tran., No. 2 at p. 76) ASAP, PG&E and SCE
informed DOE that the main drawback of using part 1 to test golf cars
is that only the worst energy performers are identified under this
approach. (ASAP, No. 11 at p. 2; PG&E, No. 12 at p. 2; SCE, No. 13 at
p. 2) They suggested that when DOE revisits the test procedure, DOE
should carefully consider the data on the efficiency of current golf
car battery chargers, and consider amending the test procedure to use
part 2 at that time. (ASAP, No. 11 at p. 2; PG&E, No. 12 at p. 2; SCE,
No. 13 at p. 2)
Not all interested parties were supportive of using part 1 of the
CEC test procedure to measure battery chargers for golf cars and other
consumer motive equipment. In AHAM's view, DOE's proposal
oversimplifies the issue because these products differ from other
battery chargers in terms of battery chemistry, usage, and charging
equipment. Because of these complexities, AHAM argued in favor of
adopting a separate test procedure section for these products. (AHAM,
Pub. Mtg. Tran., No. 2 at pp. 74-75; AHAM, No. 10 at p. 5) Delta-Q
reiterated this point but did not believe that there was any reason to
exclude these 750-1000W size battery chargers from efficiency standards
(Delta-Q, No. 5 at p. 1).
Contrary to the comments made by AHAM, there are similarities
between battery chargers for golf cars and other consumer products,
such as motorized wheelchairs, since they all require lead-acid
batteries and use battery chargers with similar technologies. For more
information on these products and their technical similarities, please
refer to chapter 3 of DOE's preliminary technical support document for
energy conservation standards for battery chargers and external power
supplies. See http://www1.eere.energy.gov/buildings/appliance_standards/residential/battery_external.html.\11\
---------------------------------------------------------------------------
\11\ Chapter 3 of the technical support document contains the
Market and technology Assessment, which includes additional details
on all products that may be affected by DOE's energy conservation
standards rulemaking effort. The docket number for this parallel
rulemaking is EERE-2008-BT-STD-0005 (RIN: 1904-AB57).
---------------------------------------------------------------------------
The technical similarities between these types of products allow
them to be tested in a similar fashion. DOE has also considered PG&E's
experience in developing the CEC test procedure on which DOE's proposal
is largely based. In developing the CEC procedure, PG&E tested golf
cars using the methods that are currently prescribed in both Part 1 and
Part 2 of the CEC test procedure. DOE has given careful consideration
to PG&E's statement that golf cars and other consumer motive equipment
can be accurately tested under either part 1 or part 2 of the test
procedure.
While DOE agrees with PG&E's overall assessment regarding the
potential limitations applicable to part 1 of the CEC test, the
additional testing requirements and complexity of part 2, which was
intended for industrial applications, suggest that the adoption of part
2 for consumer products would constitute an unnecessary testing burden
that would not be likely to increase the accuracy of the test results
that would otherwise be gleaned from part 1. The test procedure
provisions in part 2 may be necessary to accurately measure the energy
efficiency of large industrial battery chargers but for golf cars and
other types of consumer motive equipment (collectively, consumer motive
equipment) that fall at the low-power end of the lead-acid battery
charger range, the need for a specialized test procedure is not as
clear. For example, part 2 requires a series of tests under various
conditions to detect any differences in energy consumption. The greater
comprehensiveness to this approach is better suited to high-power
industrial chargers, which are already very efficient when compared to
the consumer products that could be tested under part 2. Moreover,
since consumer products that could be tested under part 2 have greater
variations in efficiency than industrial chargers, requiring
manufacturers to test these products using the simpler test method
outlined in part 1 should generate sufficiently accurate results
without imposing the greater burden that would likely be posed by
requiring part 2. Therefore, in consideration of this situation,
today's final rule specifies that part 1 be used for these products.
3. Definitions
DOE proposed to make a number of changes to the definitions in the
battery charger test procedure contained in 10 CFR, subpart B, appendix
Y. Specifically, DOE proposed to delete
[[Page 31759]]
two definitions from the current battery charger test procedure, modify
four definitions, and add 15 new definitions to appendix Y. 75 FR
16966. After reviewing the comments submitted in response to this
proposal, DOE has decided to apply certain terms used in the CEC
procedure as part of the revised set of battery charger-related
definitions. To implement these changes, DOE is amending section 2 of
appendix Y by amending, deleting, and incorporating new definitions to
make appendix Y consistent with the CEC procedure. DOE is also removing
definitions used only in section 4(a) of appendix Y (inactive mode
energy consumption measurement), which DOE is removing with today's
final rule (see section 5.a of this final rule).
a. Deleting Existing Definitions
The specific changes in today's final rule consist of a series of
deletions, amendments, and additions. These changes include removing
the definitions of ``accumulated nonactive energy'' and ``energy ratio
or nonactive energy ratio'' from the regulations, as they are relevant
only to the nonactive mode measurement of the procedure. That portion
of the procedure is being removed as part of this final rule. Details
of these deletions can be found in section III.B.3.a of the NOPR. 75 FR
16958, 16966. Commenters did not oppose the proposed deletions.
DOE received comments suggesting the removal of two definitions
from its current test procedure. ASAP, PG&E, and SCE recommended the
removal of definitions of ``detachable'' and ``integral'' batteries,
which are contained within the definition of ``battery or battery
pack'' in the current DOE test procedure. These commenters argued that
these particular definitions are not required when carrying out the
test procedure and that their inclusion within the regulation could
create confusion since some batteries are neither detachable nor
integral. Commenters cited as an example products that use AA or AAA
rechargeable batteries to power a device, but recharge those batteries
in a device external to the product. They also added that some lead-
acid batteries for automotive and marine applications may also not meet
either definition. (ASAP, No. 11 at pp. 10-11; PG&E, No. 12 at pp. 10-
11; SCE, No. 13 at pp. 10-11) These commenters further stated that the
terms are only used for the battery selection process, and ``[t]he key
element is not whether the batteries are integral or detachable, but
rather whether or not they are packaged with the charger and therefore
constitute `typical' batteries.'' (ASAP, No. 11 at p. 11; PG&E, No. 12
at p. 11; SCE, No. 13 at p. 11)
DOE's test procedure will continue to define detachable and
integral batteries. Although commenters indicated that these terms are
only used for the battery selection process, they are also used in the
standby and off mode tests, which remain as part of the amended test
procedure. Both of these tests require the disconnection of the battery
from the end use product except in cases where an integral battery,
which, by definition, cannot be disconnected from the end use product,
is used. See 10 CFR part 430, subpart B, appendix Y. The continued use
of these terms and their definitions helps provide clarity to these
procedures.
b. Revising Existing Definitions
DOE had also proposed to modify the definitions of ``active mode,''
``multi-port charger,'' ``multi-voltage [agrave] la carte charger,''
and ``standby mode'' found in appendix Y. The proposed changes were
minor and designed to clarify the wording of those definitions. DOE
received no comments regarding these definitions in response to the
NOPR. For ``active mode'' and ``standby mode,'' DOE is clarifying that
these terms can be used interchangeably with the terms ``charge mode''
and ``no-battery mode'' respectively. Additionally, the terms ``multi-
port charger'' and ``multi-voltage [agrave] la carte charger'' are
being revised to be consistent with the corresponding CEC definitions
and are expanded to encompass a batch charger. Details of these
proposed revisions can be found in section III.B.3.b. of the NOPR. 75
FR 16958, 16966.
c. Adding New Definitions
Finally, because DOE proposed adding procedures to measure energy
consumption in active mode for a battery charger, DOE also proposed the
inclusion of a number of new corresponding definitions. In particular,
DOE proposed to add definitions for ``active power or real power (P),''
``ambient temperature,'' ``apparent power (S),'' ``batch charger,''
``battery rest period,'' ``rated energy capacity,'' ``C-rate,''
``equalization,'' ``instructions or manufacturer's instructions,''
``measured charge capacity,'' ``rated battery voltage,'' ``rated charge
capacity,'' ``total harmonic distortion (THD),'' and ``unit under test
(UUT).'' See 75 FR 16958, 16967.
Commenters provided feedback on DOE's proposed definitions for
``instructions or manufacturer's instructions,'' ``power factor,''
``rated charge capacity,'' and ``total harmonic distortion,'' as
discussed in the sections, below. No other comments were provided
regarding the other proposed definitions.
Instructions or Manufacturer's Instructions
DOE proposed to define the term ``manufacturer's instructions'' as
``the documentation packaged with the product in printed or electronic
form and any information about the product listed on a Web site
maintained by the manufacturer and accessible by the general public at
the time of the test.'' 75 FR 16958, 16967. Commenters expressed
concern with the proposed definition for manufacturer's instructions.
PG&E referred DOE to the CEC test procedure, which defines the term
``manufacturing instructions'' broadly to permit testing labs to use
information that is unavailable to consumers. (PG&E, Pub. Mtg. Tran.,
No. 2 at p. 23) PG&E also supported DOE's decision to expand the
definition of manufacturer instructions to include information provided
on manufacturers' Web sites. However, it stated that service
instructions should be included to enable manufacturers to provide
information not generally available to consumers. Service instructions
may include detailed information to technicians that explain how to
disassemble the product to gain access to an integral battery or a
battery that has protective circuitry. (PG&E, Pub. Mtg. Tran., No. 2 at
pp. 246-247) PTI indicated that such information would not ordinarily
be provided to consumers in light of the potential safety hazard posed
by the disassembly of the product by an untrained individual. (PTI,
Pub. Mtg. Tran., No. 2 at pp. 247). PTI supported the inclusion of
service instructions as part of the definition so long as the testing
is carried out by professional technicians and those detailed
instructions do not become public. (PTI, Pub. Mtg. Tran., No. 2 at pp.
248-249) ASAP, PG&E, and SCE encouraged DOE ``to expand the definition
of `manufacturer's instructions' to include both consumer instructions
and service instructions.'' (ASAP, No. 11 at p. 3; PG&E, No. 12 at p.
3; SCE, No. 13 at p. 3) They recommended that DOE should take one of
the following approaches: (1) utilize the original CEC language or (2)
adopt alternative language in which DOE would define ``manufacturer's
service instructions to consumers'' separately from ``manufacturer's
service instructions.'' By defining them separately, DOE can specify
that only the consumer instructions should be used when setting up a
product in
[[Page 31760]]
preparation for the charge test, but either can be used to access the
battery for the discharge test, since disassembly to reach the battery
will never be needed for the charge test but may be necessary for the
discharge test. (ASAP, No. 11 at p. 3; SCE, No. 13 at p. 3; PG&E, No.
12 at p. 3) Finally, AHAM commented that the test procedure should not
encourage a test technician to open a sealed battery pack or
compartment. (AHAM, No. 10 at p. 7)
PG&E and PTI both suggested that service instructions should be
included in the definition of manufacturer instructions, and permit
these documents to be used to perform testing, according to the CEC
definition. The CEC defines that term to include ``any service manuals
or data sheets that the manufacturer offers for sale to independent
service technicians, whether printed or in electronic form.'' \12\
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After considering these comments, DOE has decided to modify its
initial proposal and to adopt the CEC definition for manufacturer's
instructions, which includes service instructions in its definition.
DOE is taking this step to ensure that testing technicians have
adequate information on how to access the battery. DOE will also
specify that if service instructions are used to perform testing, it
should clearly be stated in the certification report to avoid potential
confusion if the particular product is subjected to verification
testing. A copy of the instructions should be provided to DOE for
verification purposes.
Power Factor and Crest Factor
DOE proposed to include definitions for both power factor and crest
factor as part of the battery charger test procedure. 75 FR 16958,
16967. The term ``power factor'' denotes the ratio of the power
consumed by a device relative to the power drawn by a device from
mains. The term ``crest factor'' refers to the ratio of the
instantaneous peak voltage relative to the root-mean-square value,
measured when charging a device. These definitions are not currently
used as part of the test procedure. DOE received comments both in favor
and against these proposed definitions.
ASAP, PG&E and SCE supported DOE's inclusion of power factor and
crest factor. In their view, the inclusion of these terms in the test
procedure would broaden its scope and applicability. These commenters
also believed that even though DOE may not be using these measurements
and definitions within the context of the current rulemaking activities
to set energy efficiency standards for battery chargers, their
inclusion in this test procedure will allow other agencies, such as the
U.S. Environmental Protection Agency (EPA), to reference this test
procedure and develop future policies regarding energy efficiency
related performance features. (ASAP, No. 11 at p. 13; PG&E, No. 12 at
p. 13; SCE, No. 13 at p. 13)
AHAM disagreed with these proposed definitions as well as the
proposed method by which to measure them. (AHAM, Pub. Mtg. Tran., No. 2
at p. 85; AHAM, No. 10 at p. 4) It argued that measuring power factor
for the purpose of regulation represents a significant departure from
most other DOE appliance energy efficiency standards. (AHAM, Pub. Mtg.
Tran., No. 2 at pp. 85-86; AHAM, No. 10 at pp. 4) AHAM continued,
stating that the test procedure provides no method for taking a power
factor measurement and that part of the problem is that the procedure
lacks a definition of source impedance. The source impedance is an
important factor because its definition affects the accurateness of the
real world losses that would stem from power factor in a consumer
product. (AHAM, Pub. Mtg. Tran., No. 2 at pp. 86-87; AHAM, No. 10 at
pp. 4-5) For consumer products, like those that use battery chargers
covered by this rulemaking, the source impedance is an electrical
description of the wiring within a house that has a direct impact on
apparent power and thus, constitutes the power factor measured for a
device. AHAM also suggested that DOE should conduct studies to
establish the range of impedance and the possible impacts of power
factor. (AHAM, No. 10 at pp. 4-5)
Additionally, PTI was concerned that DOE has not provided any
details on how to measure power factor. PTI, like AHAM, argued that to
obtain consistent and meaningful results, DOE must define the source
impedance and provide a method for how the measurement is taken. (PTI,
No. 8 at p. 3) PTI also stated that DOE should not include the power
factor and crest factor test procedure measurements and definitions in
its final rule. PTI also commented that including these definitions and
measurement methods in the test procedure would imply that DOE has
evaluated the merit of measuring power factor and crest factor, which
it has not; therefore PTI believes that DOE should not define or
require the measurement of power factor and crest factor. (PTI, No. 8
at p. 3)
In today's final rule, DOE has decided to drop its proposal
regarding power factor and crest factor. At this time, DOE has not
conducted an analysis on the benefits that could be gained from
regulating power factor or crest factor for consumer products that use
battery chargers and commenters offered no data in support of such an
approach. Although DOE acknowledges that other agencies, such as EPA,
may have an interest in using these measurements, DOE currently has no
plans to incorporate either of them for compliance purposes.
Accordingly, although DOE may revisit this issue at a later date, DOE
is declining to incorporate power factor and crest factor into today's
final rule.
Rated Charge Capacity
DOE proposed to define ``rated charge capacity'' in its
regulations. Specifically, DOE proposed to define this term as ``the
capacity the manufacturer declares the battery can store under
specified test conditions, usually given in ampere-hours (Ah) or
milliampere-hours (mAh) and typically printed on the label of the
battery itself * * * '' 75 FR 16958, 16968. The proposed definition was
consistent with the CEC test procedure's definition.\13\
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DOE received a single response to this proposal. Sony recommended
that DOE adopt the current CEC definition for rated charge capacity,
which allows the option of using a rated charge capacity unit of either
milliampere-hours (mAh) or ampere-hours (Ah). Sony opposed what it
believed was a proposal by DOE to use only Ah. (Sony, No. 6 at p. 2)
DOE notes that its proposed definition includes the use of both Ah and
mAh. 75 FR 16958, 16980.
In light of the absence of any objections to its proposed approach,
DOE will adopt its proposed definition for rated charge capacity.
Total Harmonic Distortion
In its NOPR, DOE defined ``total harmonic distortion'' as:
``the root-mean-square (RMS) value of an AC signal after the
fundamental component is removed and inter-harmonic components are
ignored, divided by the RMS value of the fundamental component.'' 75 FR
16980.
Responding to this proposal, AHAM suggested that DOE consider the
language of International
[[Page 31761]]
Electrotechnical Commission (IEC) Standard 62301, section 1.1.1
``Supply voltage waveform'' with respect to total harmonic distortion,
but did not provide reasoning for this recommendation. (AHAM, No. 10 at
p. 7)
DOE is adopting the proposed definition. DOE notes that this
language is based on those definitions that are already in use by the
Institute of Electrical and Electronics Engineers (IEEE) through
standard 1515-2000--as well as DOE's own regulations for external power
supplies. See 10 CFR part 430, subpart B, appendix Z. As a result, the
industry already follows this definition. Adopting a different
definition would conflict with DOE's intent to harmonize the approaches
contained in the battery charger and external power supply test
procedures, as well as with the industry standard currently in place.
Therefore, DOE is adopting its proposed definition for this term.
4. Test Apparatus and General Instructions
a. Confidence Intervals
DOE proposed incorporating confidence qualifiers to the confidence
intervals in its test procedure. The proposed confidence intervals were
different from the CEC intervals in that they added a 95% confidence
qualifier to the CEC intervals. As a result DOE's proposal provided for
a margin of <= 2% at the 95% confidence level for active power
measurements of 0.5 W or greater and a margin of <= 0.01 W at the 95%
confidence level for active power measurements of 0.5 W or less.
AHAM supported adding the 95% confidence qualifier to the
confidence intervals, stating that it is ``an important addition to the
standard.'' (AHAM, Pub. Mtg. Tran., No. 2 at p. 91) PTI left the use of
a confidence level for error analysis to DOE by stating that ``[s]ince
the Department alone is aware of their intention with respect to future
use of the data provided by the test procedure, they should evaluate,
through an error analysis, the impact of the error in the test data,
particularly in the case of battery capacity.'' (PTI, No. 8 at p. 3)
AHAM recommended that DOE consider the IEC 62301 Second Edition FDIS
document for methods of dealing with uncertainty, specifically for
measurements under 1 watt. (AHAM, Pub. Mtg. Tran., No. 2 at pp. 91-92;
AHAM, No. 10 at p. 6) AHAM also suggested that the Department consider
the language in section 4.2 ``Measuring equipment'' of the Canadian
Standards Association's (CSA) test method for battery chargers for
confidence limits. (AHAM, No. 10 at p. 6) Additionally, AHAM
recommended that DOE add a requirement that laboratories publish the
error analysis for their automated equipment because manufacturers may
obtain different results than verification laboratories as a result of
different sampling rates and instrument accuracy. (AHAM, No. 10 at pp.
5-6)
PTI also supported DOE's proposal, noting that DOE was correct to
address the uncertainty of the measurements rather than the equipment,
as the test equipment may not be able to deliver the same uncertainty
with different UUTs. (PTI, No. 8 at p. 4) PTI recommended that DOE
include requirements that test laboratories, particularly in the case
of verification testing, provide a suitable error analysis that
demonstrates that they have met the uncertainty requirements of the
test procedure. (PTI, No. 8 at p. 4) PTI also stated that DOE should
establish overall error requirements rather than only equipment
requirements because elements other than equipment introduce error.
(PTI, Pub. Mtg. Tran., No. 2 at pp. 95-96)
PTI added that DOE should consider the sampling rate and sampling
interval during the measurement of the energy use of a charger that
performs pulse charging--which is when a unit that sends periodic
bursts of current to the battery rather than a continual stream of
current--because these factors will affect the overall uncertainty of
the measurement (PTI, Pub. Mtg. Tran., No. 2 at p. 94).
After taking into account these comments, which generally expressed
support for DOE's proposed inclusion of the specified confidence
intervals into the test procedure, DOE decided to adopt its proposed
approach. Regarding these specific intervals and the various
recommendations offered by AHAM, DOE notes that its proposal matches
the requirements set out in IEC 62301 and, although the language is not
identical to what appears in the CSA test method, its requirements are
similar. As for PTI's concerns with respect to pulse charging, DOE is
not persuaded that any extra consideration or change is needed. By
specifying a 95% confidence level for the measurement, the technician
must ensure that the sampling rate is fast enough to capture any pulses
in order to maintain the specified statistical accuracy of his
measurement. Thus, the requirements that DOE is incorporating are
aligned with the commenters' recommendations. They also will result in
a more robust and repeatable test procedure because all results must be
expressed with a high level of confidence, which will permit less
variance in the measurements recorded for a tested device.
b. Test Laboratory Temperature
DOE proposed raising the ambient temperature during testing from 20
degrees to 25 degrees plus or minus 5 degrees Celsius in its NOPR. DOE
proposed this change because it believed 25 degrees Celsius was more
easily achievable across diverse climates and more typical of testing
environments. 75 FR 16968-69. Several commenters responded to this
aspect of the proposal.
PG&E recommended leaving the temperature range as it was. The basis
for the CEC temperature range, which has already gained industry
acceptance, stems from the applicable IEC standards for batteries. If
DOE were to alter the temperature range, it would need to conduct
additional testing to verify that the end-of-discharge voltages are
still appropriate at the high end of the range of temperatures because
the higher temperatures will have unknown effects on the chemistries of
batteries. (PG&E, Pub. Mtg. Tran., No. 2 at p. 97). AHAM agreed with
PG&E and, in its view, raising the ambient temperature during testing
would be acceptable only if DOE had first considered the end-of-
discharge voltages when making the change. (AHAM, Pub. Mtg. Tran., No.
2 at p. 98) ASAP, PG&E, and SCE urged DOE to adopt the industry
standard room temperature of 15 to 25 degrees Celsius. (ASAP, No. 11 at
p. 3; PG&E, No. 12 at p. 3; SCE, No. 13 at p. 3). These commenters
noted that the 15 to 25 degrees Celsius temperature range is the
industry standard and because the chemical reactions taking place in
batteries are temperature sensitive and the end-of-discharge voltages
are based on this range, DOE should not change the temperature range.
Altering the temperature range could have unintended and unknown
consequences on the end-of-discharge voltage. It is possible that
changing the temperature range could increase or decrease the end-of-
discharge voltage, so doing so would require testing to determine if
the end-of-discharge voltages for various battery chemistries are still
appropriate at the higher temperature range. (ASAP, No. 11 at p. 3;
PG&E, No. 12 at p. 3; SCE, No. 13 at p. 3)
AHAM alternatively recommended in its written comments that DOE
consider incorporating the IEC 62301 requirement that ``[t]he ambient
temperature shall be maintained at (235)[deg] C through the
test.'' (AHAM, No. 10 at p. 7) Although this was a departure from its
statements at the NOPR public meeting, AHAM stated
[[Page 31762]]
that it believed this value had support in the International Standards
community and would be very attainable. (AHAM, No. 10 at p. 7)
After evaluating the comments received on this issue, DOE has
decided not to increase the temperature range and to continue requiring
an ambient temperature of 20 degrees plus or minus 5 degrees Celsius.
This approach is consistent with the CEC test procedure. The lower
temperature range is widely accepted and currently used by the
industry. Adopting this approach, based on information presented to
DOE, should not impose a new burden on manufacturers to alter their
testing laboratories since the appropriate operating temperature range
remains the same. Additionally, this temperature range, which served as
the basis for the development of the end-of-discharge voltages
specified, ensures that consistency and the validity of those voltages
is maintained. For these reasons, DOE is incorporating this range into
the final rule. DOE notes that while AHAM suggested DOE consider the
IEC 62301 range of 23 degrees plus or minus 5 degrees Celsius, all
other commenters--including AHAM--indicated that a departure from the
original temperature range, 20 degrees plus or minus 5 degrees Celsius
has the potential to invalidate the end-of-discharge voltages that have
been established for the various battery chemistries used in battery
chargers. Accordingly, DOE is opting not to make such a change and will
harmonize its test procedure with other industry standards to the
extent feasible to help ensure the validity of all measured end-of-
discharge voltages.
c. Charge Rate Selection
DOE proposed to require that when testing a battery charger
equipped with user controls that enable the user to select from two or
more charge rates that the test be conducted using the fastest charge
rate that is recommended by the manufacturer for everyday use. 75 FR
16958, 16969. Commenters had varying opinions on this approach.
Delta-Q ``mildly disagreed'' with DOE's proposal for selecting the
charge rate for testing, as a charger could be significantly less
efficient at lower power levels, but they did not provide data or other
support for their reasoning. (Delta-Q, No. 5 at p. 1) Alternatively,
ASAP, PG&E, and SCE supported DOE's proposed approach. (ASAP, No. 11 at
p. 10; PG&E, No. 12 at p. 10; SCE, No. 13 at p. 10) No other pertinent
comments were submitted on this issue.
In light of these comments, and the absence of any supporting data
or information that would support Delta Q's assertion that a charger
would operate less efficiently at lower power levels, DOE is adopting
its proposed approach. DOE believes that, given a choice, users are
more likely to opt for the fastest charge that does not impact the
battery's long-term health, as evidenced by the popularity of
successively faster chargers in the market. (Battery Charger Test Data,
No. 18.3) DOE presented this view during the NOPR public meeting and
received no comments disputing this view. Consequently, DOE is
requiring that testing occur at the fastest charge rate that is
recommended by the manufacturer for everyday use. Doing so will reduce
the test procedure burden on manufacturers while producing
representative measurements of energy use.
d. Battery Selection
DOE proposed to require testing with a battery or combination of
batteries, depending on the charger type--i.e. multi-voltage, multi-
port, or multi-capacity. This approach is consistent with the CEC test
procedure. 75 FR 16958, 16969. For those battery chargers that come
either with no batteries or multiple batteries, DOE also sought comment
on an alternative approach that would require the testing of only the
configuration of batteries most commonly used with the device, but no
comments or data were received on this approach. 75 FR 16969, 16979.
AHAM commented that if the manufacturer recommends a battery for
use with the product, the Department should consider using only that
battery, and not any others, for measuring energy consumption during
testing. (AHAM, Pub. Mtg. Tran., No. 2 at pp. 112-113) ASAP, PG&E, and
SCE supported DOE's proposal to test the battery charger with only the
typical battery configuration but suggested a change to improve the
repeatability of the battery selection process. (ASAP, No. 11 at p. 10;
PG&E, No. 12 at p. 10; SCE, No. 13 at p. 10) Specifically, these
commenters suggested changing section 4.3 (3) of appendix Y to be more
restrictive than the proposed ``any [battery] suitable for use with the
charger''-approach set forth in the NOPR. These commenters suggested
that DOE's test procedure recommend searching within brand name
batteries that are readily available in the region where the product is
sold or being tested. (ASAP, No. 11 at p. 10; PG&E, No. 12 at p. 10;
SCE, No. 13 at p. 10)
DOE is incorporating its proposed approach because it received no
comments suggesting alternative approaches that would allow a battery
charger to be tested with a single battery that would generate a result
that is ``a representative average use cycle.'' See 42 U.S.C.
6293(b)(3). Under this approach, if the battery is packaged with the
charger, then the charger is tested with only this battery.
Alternatively, if the charger is not packaged with a battery, and is
multi-port, multi-capacity, or multi-voltage in configuration, testing
with a single battery, as recommended by interested parties, may not be
a representative average use cycle and more than one test is needed to
accurately assess the average use of that product. Although DOE's
proposed approach can require up to three tests, which is potentially
burdensome, it ensures that the test procedure fulfills this statutory
requirement. See 42 U.S.C. 6293(b)(3). This approach should also enable
DOE to account for all possible battery combinations that can be used
in the charger rather than just the most typical configurations.
In response to the preliminary analysis for energy conservation
standards for battery chargers and external power supplies, DOE
received related comments. Motorola commented that the CEC test
procedure, upon which DOE based its test procedure, is not completely
clear in defining how to select batteries for testing and that DOE
should clearly define how to select batteries for testing. They added
that DOE should define the terms ``lowest voltage'' and ``highest
voltage.'' (Motorola, No. 50 at p. 2) \14\
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\14\ The comments listed in this paragraph come from
administrative record for the parallel rulemaking on energy
conservation standards for battery chargers and external power
supplies. The reference docket number is EERE-2008-BT-STD-0005 (RIN:
1904-AB57).
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As mentioned, DOE is incorporating its proposed approach for
selecting batteries with which a technician should test a unit under
test. Although the procedure does not define the terms ``highest
voltage'' and ``lowest voltage,'' DOE believes that these terms clearly
refer to the rated battery voltage because that is the pertinent
information that manufacturers will provide when they package or
recommend batteries to use with their devices. The other voltages that
Motorola references in its comment (e.g. desired end-of-discharge
battery voltage) are voltages that must be monitored after the testing
has commenced and are not pertinent for selecting batteries to test.
Accordingly, DOE is declining to define these particular terms at this
time.
[[Page 31763]]
e. Non-Battery Charging Functions
DOE proposed to implement a procedure for testing battery chargers
with non-battery charging functions that would be consistent with the
CEC approach. The CEC method requires the tester to turn off any user-
controlled functions and disconnect all auxiliary electrical
connections to the battery charger. 75 FR 16958, 16969.
Commenters had mixed views regarding non-battery charging
functions. PG&E, Delta-Q, ASAP and SCE agreed with DOE's approach. PG&E
stated that it agreed that the test procedure should not provide any
energy allowances for battery chargers with extra functionality and
agreed that any such functionality should be turned off during testing.
(PG&E, Pub. Mtg. Tran., No. 2 at p. 15) Delta-Q agreed with DOE's
approach for non-battery charging functions. (Delta-Q, No. 5 at p. 2)
ASAP, PG&E, and SCE stated that testing conducted for the development
of the CEC test procedure found that turning off or disconnecting
additional functions is the only approach that results in accurate
measurements of standby power while providing a means to compare the
energy consumption of products with and without additional
functionality against each other. (ASAP, No. 11 at p. 3; PG&E, No. 12
at pp. 3-4; SCE, No. 13 at p. 4) Sony asked for clarification on how
the additional functionality section in the proposal would pertain to
video products (Sony, No. 6 at p. 2).
In contrast, PTI commented that since battery charging is often
secondary to the main function of the product, requiring the non-
battery charging functionality to be turned off during testing would be
inconsistent with the general approach of trying to satisfy the user's
requirements. (PTI, Pub. Mtg. Tran., No. 2 at p. 119) In response, PG&E
offered a solution to manufacturers and stated that manufacturers could
design additional functionality into their products to ensure that the
additional functionality will not consume enough power to prevent a
battery charger from meeting any energy conservation standards that DOE
might set. (PG&E, Pub. Mtg. Tran., No. 2 at p. 120)
PTI suggested an alternative method to account for non-battery
charging functions. It suggested conducting the battery charger test
with and without the battery; the difference between the two
measurements would be the energy used to charge the battery. Although
this method excludes the standby component, PTI believed that the error
associated with its exclusion is less significant than the error that
would result from treating all of the products as if they were
augmented battery chargers. (PTI, Pub. Mtg. Tran., No. 2 at pp. 123-
124)
When developing its test procedure, DOE considered how to isolate
the energy consumption of the battery charging circuitry in cases where
the charger is embedded inside another product that provides additional
functionality, such as video products and notebook computers. The test
procedure must ensure that measurement of energy use for these types of
products accounts for the energy used by this additional functionality.
DOE believes that its proposed method is best suited to capture these
measurements compared with the other methods suggested by commenters
because it does not discount power consumption in other modes of
operation, as the suggested approach by PTI would do.
The method in this final rule is consistent with that of the
generally accepted CEC test procedure, which applies equally to all
products, including video products. By requiring that any switches
controlling the additional functionality be turned off, and any
auxiliary cables or connections be disconnected, this method provides
manufacturers with a cue to shut down the additional functionality. As
a result, only the battery charging portion of the battery charger is
measured during testing. DOE notes that if a manufacturer does not
equip its product with a switch to shut off non-battery charger
functions, it may continue to do so. During testing, the energy
consumption of these functions would still be calculated as part of a
given product's total energy consumption. For this reason, DOE believes
that it is likely that manufacturers of these types of products, in
order to continue to maintain the added functionality, would be
encouraged to minimize the energy consumed by these non-battery charger
functions when designing their products.
f. Battery Chargers With Protective Circuitry
DOE proposed to incorporate text from the CEC test procedure
related to protective circuitry. 75 FR 16958, 16982. Incorporating this
change would allow technicians to accurately measure the discharge
energy of a battery without including energy from the protective
circuitry. This measurement is important for the test procedure because
it is equivalent to the useful, or non-lost, energy consumed during a
charge cycle. The text was proposed for incorporation as part of DOE's
overall adoption of the CEC test procedure. DOE did not propose to
change the language of the CEC test procedure pertaining to protective
circuitry in its NOPR. However, commenters provided feedback on the
language in the CEC test procedure, stating that it contained an error.
Commenters asserted that the language that DOE proposed to
incorporate from the CEC-based test procedure contained an error that
the CEC has not yet corrected. These commenters recommended that DOE
adopt the language that the CEC had apparently intended to use in its
procedure when testing battery chargers equipped with protective
circuitry, rather than the language that CEC ultimately adopted.\15\ In
the view of these commenters, the procedure should have stated that
when protective circuitry is present, the technician should take the
measurement at the leads of the battery cells after the protective
circuitry rather than at the terminals of the test battery to ensure
that the energy consumption of the protective circuitry is accurately
measured. (PG&E, Pub. Mtg. Tran., No. 2 at p. 23, 181-184) ASAP, PG&E
and SCE also recommended incorporating language that matched the
language that CEC had intended to incorporate into its test procedure.
(ASAP, No. 11 at p. 11; PG&E, No. 12 at p. 11; SCE, No. 13 at p. 11)
PTI also agreed with the suggested revision. (PTI, Pub. Mtg. Tran., No.
2 at p. 184) ASAP, PG&E and SCE indicated that their collective belief
is that CEC will adopt the corrected language in their next test
procedure revision, although this revision has yet to occur. (ASAP, No.
11 at p. 11; PG&E, No. 12 at p. 11; SCE, No. 13 at p. 11) PG&E and SCE
are two of the primary consulting firms that helped develop the CEC
test procedure. DOE received no comments opposing the revision
recommended by ASAP, PG&E, and SCE. Additionally, commenters mentioned
how the new methodology will increase safety in the test labs because
technicians will not be required to dismantle battery packs and create
connections between the battery and its protective circuitry. (ASAP,
No. 11 at p.
[[Page 31764]]
11; PG&E, No. 12 at p. 11; SCE, No. 13 at p. 11)
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\15\ The language adopted in the CEC test procedure states:
``Some products may include protective circuitry between the battery
cells and the remainder of the device. In some cases, it is possible
that the test battery cannot be discharged without activating
protective control circuitry. If the manufacturer provides a
description for accessing connections at the output of the
protective circuitry, the energy measurements shall be made at the
terminals of the test battery, so as not to include energy used by
the protective control circuitry.'' See part 1, section II.F of CEC
test procedure.
---------------------------------------------------------------------------
In light of the new information presented by PG&E regarding the CEC
test procedure and the noted safety benefits, DOE is altering its
proposal to incorporate language that will require testing to occur at
the output of the protective circuitry, rather than at the test battery
terminals. As noted, the primary benefit of this approach is increased
safety within the testing laboratory. The protective circuitry that is
used in battery chargers is usually found in cases where a battery
charger works with a lithium-ion chemistry battery. Due to their
chemistry, these batteries can be unstable, which is why the protective
circuitry is used. Consequently, DOE believes it is prudent that such
circuitry should be used, and not dismantled, when measurements are
taken for this test procedure.
g. Charge Capacity of Batteries With No Rating
The battery charger test procedure currently requires the use of a
battery capacity rating in order to determine the rate at which the
discharge test is performed. This section describes how DOE decided to
address batteries that have no rating. DOE proposed a method for
determining the capacity of batteries with no ratings. That method was
an iterative process requiring the use of an initial 0.5 amp (A) trial
current (hereafter referred to as the 0.5 A test method). 75 FR 16970.
The proposed process would require that the user iteratively adjust the
initial 0.5 A, until he or she reaches a discharge current that could
discharge that battery at a 0.2 C rate (``C rate'' refers to the amount
of time in hours it would take to discharge the battery relative to its
capacity), which corresponds to an approximately 5-hour discharge. DOE
proposed that so long as the battery was discharged within 4.5 to 5.5
hours, or an hour-long window of time, the result of the discharge test
could be accepted as valid. 75 FR 16983. Commenters had mixed opinions
on both the time frame acceptance window and the 0.5 A test method.
These comments are addressed below.
Acceptance Window
An acceptance window is the time frame in which a measurement of
battery energy can be taken and considered appropriate for the UUT. It
is critical for testing purposes because it ensures consistency and
repeatability. Commenters generally urged DOE to decrease its
acceptance window to a range of 4.5 to 5 hours, which would decrease
the proposed acceptance window of 1-hour down to 30 minutes. (ASAP, No.
11 at p. 4; PG&E, No. 12 at p. 4; SCE, No. 13 at p. 4) PG&E claimed
that the proposed 1 hour window causes unacceptable errors and
recommended a half-hour maximum window to decrease the likelihood of
measurement errors. (PG&E, No. 2 at p. 20) It explained that a half-
hour time window for the discharge time of unrated batteries introduces
a 2-percent error in the energy use measurement, while a 1-hour time
window introduces an error of about 4 to 5 percent. However, a 15-
minute time window would, in its view, be preferable. (PG&E, No. 2 at
p. 106; ASAP, No. 11 at p. 6; PG&E, No. 12 at p. 6; SCE, No. 13 at p.
6) Manufacturers provided no comments regarding the proposed time
window.
Commenters agreed that a shorter acceptance window of 4.5 to 5
hours is more appropriate than the 4- to 5-hour time window that DOE
proposed. DOE believes that a 15-minute window would be unduly
burdensome since it reduces the originally proposed time period by one-
fourth and will require more iterations to accomplish. DOE recognizes,
however, the merit of using a shorter acceptance window and is
adjusting this element in its procedure to cover a 30-minute window as
suggested by the commenters. The tighter acceptance window will produce
more precise results than what the proposed 1-hour window would have
yielded and will not be unduly burdensome to perform.
Method for Determining the Capacity of Batteries With No Rating
As mentioned above, DOE proposed using the 0.5 A test method to
determine the capacity of batteries with no ratings as a method to
achieve a current that would discharge the battery within the time
acceptance window. Properly discharging a battery is necessary to
ensure that the useful energy that was transferred from the battery
charger to the battery is accurately measured and not misconstrued as
lost energy. However, commenters were generally critical of DOE's
proposal.
ASAP, PG&E, and SCE strongly encouraged DOE to remove its proposed
instructions for determining the discharge current for batteries
without capacity labels. (ASAP, No. 11 at p. 4; PG&E, No. 12 at p. 4;
SCE, No. 13 at p. 4) They commented that for batteries with no rated
capacity, the 0.5 A initial trial current is not always appropriate.
Specifically, in their view, a current of 0.5 A works well primarily
for batteries with capacities from about 0.5 Ah to 4 Ah. However, for
products that cannot accept currents of 0.5 A (i.e. smaller batteries
with lower capacities, such as those used with Bluetooth headset
batteries) or that have large capacities (i.e. batteries with
capacities in the range of 35 to 50 Ah, such as those used with
electric scooters), a 0.5 A current would either not be possible or
require an amount of time well in excess of the 5 hour maximum proposed
by DOE--potentially, multiple days in duration. (PG&E, No. 2 at p. 20;
ASAP, No. 11 at p. 7; PG&E, No. 12 at p. 7; SCE, No. 13 at p. 7) PTI
also stated that it believed the 0.5 A starting current may be
inappropriate and they believed that better results may come from trial
and error as is suggested in the CEC test procedure. (PTI, Pub. Mtg.
Tran., No. 2 at p. 102) ASAP, PG&E, and SCE added that DOE's proposed
method does not always produce repeatable results, particularly when
the results of the protocol for determining discharge time push the
discharge time near the boundaries of the acceptance discharge time
window. (ASAP, No. 11 at p. 4; PG&E, No. 12 at p. 4; SCE, No. 13 at p.
4)
ASAP, PG&E, and SCE proposed an alternative to the 0.5 A test
method. Their method bases the initial discharge current on battery
weight. (ASAP, No. 11 at pp.18-19; PG&E, No. 12 at pp. 18-19; SCE, No.
13 at pp. 18-19) ASAP, PG&E, and SCE suggested that if DOE considers it
necessary to include instructions regarding the determination of the
capacity of unrated batteries, DOE should consider adding the following
steps:
1. Pick an initial trial current which is deliberately too low. A
reasonable step is to weigh or measure the battery and divide the
number of cells to obtain grams per cell or cm\3\ per cell.
2. Be sure the battery is fully charged and discharged at the
current selected in step 1 for up to 2 hours. If the end-of-discharge
voltage is reached before 2 hours, stop the discharge and go to step 5.
If not, after 2 hours of discharge go to step 3.
3. Double the current.
4. Discharge the battery at the new current for up to 1 hour. If
the end of discharge voltage is reached before 1 hour, stop the
discharge and go to step 5. If not, after 1 hour of discharge, repeat
steps 3 and 4.
5. For the first discharge, compute the total charge capacity as
the sum of the capacities of each step to discharge. For each step, the
partial capacity is the product of the current and the time for which
that current was drawn. (The total charge is defined as the integral of
[[Page 31765]]
the current over time.) Call this [value the] total charge capacity
Q0.
6. The last discharge current is called I0 and let
Tm be the center of the acceptable time window, (perhaps
4.75 hours). Calculate the next trial current as:
I1=(Q0/Tm) * (1.0 + 0.2 * 1n
(I0 * Tm/Q0))
where ln() is the natural logarithm function.
7. Discharge at this current I1 until the end-of-
discharge voltage is reached. Call the time required for this discharge
T1. If T1 is within the acceptable window, use
I1 as the discharge current. If not, continue with step 8.
8. Compute the next trial current I2:
a. I2=(I1*T1/Tm) * (1.0 +
0.2 * 1n (Tm/T1))
b. Repeat step 7.
(ASAP, No. 11 at pp. 18-19; PG&E, No. 12 at pp. 18-19;; SCE, No. 13 at
pp. 18-19;)
Adopting such a method would address the concern raised by Delta-Q,
who requested that a provision be included for batteries with no rated
capacity that allows (1) a larger starting current and (2) current
steps to be estimated based on the battery size and weight. (Delta-Q,
No. 5 at p. 2)
ASAP, PG&E, and SCE added that the instructions in DOE's proposal,
or any instructions generally, would not improve the repeatability or
accuracy of the CEC method to select a discharge current, but would
instead complicate the details of the test method and limit the
flexibility of test labs and manufacturers to determine their own
discharge rate by requiring that they obtain that rate using the
specific DOE instructions. (ASAP, No. 11 at p. 4; PG&E, No. 12 at p. 4;
SCE, No. 13 at p. 4) ASAP, PG&E, and SCE urged DOE to not require steps
to determine discharge current and instead to require only that the
discharge current satisfy the time acceptance window. (ASAP, No. 11 at
p. 5; PG&E, No. 12 at p. 5; SCE, No. 13 at p. 5)
After carefully considering all of the comments, DOE is modifying
the approach it proposed. In particular, DOE will incorporate a
specific time acceptance window but not specify at this time the method
for manufacturers to follow when discharging an unrated battery. By
adopting this new approach, the measured efficiency of the battery
charger will not be affected because technicians will have the freedom
to rely on their expertise and will not be required to use a method
that may be inappropriate for very large or very small batteries
contained within a battery charger. DOE is declining to incorporate the
suggested battery weight method offered by ASAP, PG&E, and SCE. In
evaluating this method, which included conducting actual tests using
this suggested approach, DOE found that it took many iterations--as
many as eight in some cases--to obtain the proper discharge current.
(Battery Charger Test Data, No. 18.3) DOE believes that sufficiently
accurate testing can occur because the test procedure requires that the
discharge test be completed within a half an hour acceptance window.
This requirement will ensure that technicians discharge their battery
at a rate close to the 0.5 C-rate that is required when the charge
capacity of the battery is known.
Battery Capacity Listings
The final comment pertaining to unrated batteries related to the
manner in which manufacturers communicate to end users and technicians
the charge capacity specifications of a battery. DOE had proposed that
the technician refer to a manufacturer's instructions to obtain a rated
charge capacity. 75 FR 16982. Subsequently, AHAM commented that Web
pages are an effective way to allow the manufacturer to communicate
this information. (AHAM, No. 2 at p. 126) DOE notes that its proposal
already permits manufacturers to communicate the specifications in this
manner because its definition of ``instructions or manufacturer's
instructions'' includes Web page information. 75 FR 16958, 16980.
Accordingly, in the absence of any objections to its proposal, DOE is
adopting its proposed approach to refer technicians to manufacturer's
instructions for information regarding battery capacity.
h. Battery Conditioning
DOE proposed to require conditioning of the battery by performing
two charges and two discharges, resulting in two conditioning cycles.
Battery conditioning is the process by which the battery is cycled
several times prior to testing in order to permit the battery to reach
its specified capacity. DOE proposed these conditioning cycles to
prepare the battery for testing while ending on a discharge of the
battery. This step was necessary within the context of the proposed
testing order. The proposal reversed the testing order from the one
currently prescribed under the CEC testing provisions. 75 FR 16958,
16971.
Responding to this proposal, ASAP, PG&E, and SCE collectively
recommended that DOE require three cycles of battery conditioning to
maintain repeatability. (ASAP, No. 11 at p. 8; PG&E, No. 12 at p. 8;
SCE, No. 13 at p. 8) Although nickel-based batteries (e.g. NiCd or
NiMH) can take between 5 and 100 cycles to ``develop their full
capacity,'' these commenters pointed out that interested parties
reached a consensus during the CEC rulemaking that 3 cycles is an
acceptable compromise between accuracy and repeatability. (PG&E, Pub.
Mtg. Tran., No. 2 at p. 22; ASAP, No. 11 at p. 8; PG&E, No. 12 at p. 8;
SCE, No. 13 at p. 8) In golf cars and similarly-sized applications with
large battery packs, Delta-Q noted that testing for several cycles
could take several weeks if different manufacturers and models are
considered. (Delta-Q, No. 5 at p. 2)
The CEC test procedure requires that the batteries requiring
conditioning be prepared by performing three charges and two
discharges. DOE proposed to remove the final preparatory charge and
replace it with a measured charge as would have been required by the
proposed reversed testing order. However, because of the concerns
raised by commenters in response to DOE's proposal, and the potential
risk identified by the commenters that such an approach may decrease
the accuracy of the test, DOE is dropping its proposed testing order
and is adding a final preparatory charge as suggested by interested
parties. Although PG&E, ASAP, and SCE commented that some nickel-based
batteries need 5 to 100 cycles to develop their full capacity, they
also stated that the three cycles specified in the CEC method was an
acceptable compromise between accuracy and repeatability. Other
commenters did not dispute the sufficiency of using three cycles.
A battery must be stable during testing to ensure the repeatability
of measurements related to capacity. Because the battery becomes more
stable as additional charge-discharge cycles are performed, more than
one cycle must be used. Adopting a requirement that provides for three
cycles should be sufficient to ensure the stability of the battery
because most battery chemistries will reach a relatively steady state
at this point and three tests will not impose an excessive testing
burden. Accordingly, DOE is adopting a three cycle approach to ensure
battery stability is achieved during testing.
Additionally, DOE is incorporating a conditioning section into the
test procedure, as requested by ASAP, PG&E, SCE, and Sony. Commenters
had noted that the proposed regulatory text did not include a section
regarding battery conditioning. (ASAP, No. 11 at p. 8; PG&E, No. 13 at
p. 8; SCE, No. 12 at p. 8; Sony, No. 6 at p. 2). To address this issue,
DOE is incorporating a
[[Page 31766]]
conditioning section that is consistent with the approach followed by
the CEC. This new requirement will be inserted into 5.3 of amended
appendix Y of subpart B of part 430 and will help ensure the
completeness of the test procedure.
i. Rest Period
DOE proposed to permit a rest period for both charged and
discharged batteries from 1 to 24 hours. 75 FR 16958, 16984. A rest
period is the period between the preparation of a battery and the
battery discharge test. It also includes the period between the battery
discharge test and the charge and maintenance mode tests. 75 FR 16958,
16967. A rest period is required to enable the battery to return to the
ambient temperature, which is a necessary prerequisite to ensure
consistent testing conditions. This proposal differed from the rest
period in the CEC test procedure, which prescribes a period of 1 to 4
hours for charged batteries and 1 to 24 hours for discharged batteries.
See III.C and III.E of part 1 of the CEC test procedure.
ASAP, PG&E, and SCE asserted that the proposed rest period ``is
inconsistent with the CEC-adopted test procedure as well as industry
standards.'' (ASAP, No. 11 at p. 14; PG&E, No. 12 at p. 14; SCE, No. 13
at p. 14) The interested parties further commented that ``regardless of
the test order, the rest periods should be 1 to 4 hours for charged
batteries and 1 to 24 hours for discharged batteries.'' The shorter
rest period for charged batteries would minimize the self-discharge
effect that occurs in NiCd and NiMH batteries. (ASAP, No. 11 at p. 14;
PG&E, No. 12 at p. 14; SCE, No. 13 at p. 14)
In this final rule, DOE is adopting the language from the CEC test
procedure, in part to maintain consistency with industry testing
protocols. Providing a shorter rest period for charged batteries also
ensures that certain types of batteries (such as the NiCd and NiMH
batteries discussed above) do not self-discharge, making the test
results more consistent. Incorporating a 1 to 4 hour rest period for
charged batteries will help harmonize the DOE test procedure with these
widely accepted industry standards, as well as minimize the possibility
of self-discharging of batteries with NiCd or NiMH chemistries.
Additionally, in its NOPR, DOE also proposed that ``for batteries
with flooded cells, the electrolyte temperature shall be less than 33
degrees Celsius before charging.'' 75 FR 16958, 16984. DOE had intended
to adopt the language from the CEC test procedure, which specifies an
under 30 degree Celsius requirement. No comments were received
regarding this issue. In this final rule, DOE is incorporating the
corrected temperature requirement, which is consistent with that
retained in the CEC test procedure. See part 1, sections II.C and II.E
of the CEC test procedure.
5. Test Measurement
a. Removing Inactive Mode Energy Consumption Test Apparatus and
Measurement
DOE proposed removing its inactive mode energy consumption test. 75
FR 16958, 16970. The inactive mode energy consumption measurement in
section 4(a) of appendix Y prior to today's final rule prescribed a
method for calculating a nonactive energy ratio. Both industry and non-
industry commenters responded to this proposed change.
PG&E, Delta-Q and AHAM supported DOE's proposal to drop its
inactive mode procedure and to replace it with one that measures active
mode energy consumption. (PG&E, Pub. Mtg. Tran., No. 2 at p. 51; AHAM,
Pub. Mtg. Tran., No. 2 at p. 47; Delta-Q, No. 5 at p. 2) However, PTI
did not agree with removing the nonactive mode metric because, in its
view, the removal of this metric would remove an aggregate measure of
the energy use of the product in a variety of modes. (PTI, No. 8 at p.
1) Commenters also raised concerns related to usage profiles, noting in
particular that they are necessary to determine how a product is truly
used and what energy savings potential actually exists. (AHAM, Pub.
Mtg. Tran., No. 2 at p. 48, PTI, Pub. Mtg. Tran., No. 2 at p. 49)
(Usage profiles are assumptions, based on a variety of sources,
including manufacturers, surveys, and other publicly available data,
about the amount of time products spend in each mode of operation.
These assumptions represent the manner and frequency with which a
product is used. Usage profiles are valuable in that they help show how
a product is used, which can be helpful in determining its energy
consumption during typical consumer usage in all modes of operation.)
Performing the inactive mode test procedure requires integrating
the input power of the battery charger in maintenance mode and no
battery mode. That value is divided by the battery energy measured
during discharge, resulting in a nonactive energy ratio. However,
today's final rule incorporates an active mode test, which will,
collectively, with the other portions of the amended test procedure,
result in a battery charger test procedure that measures battery
charger energy in all four modes (i.e., active, maintenance, standby,
and off). Consequently, there is no need for the continued use of a
nonactive mode metric since the energy that was previously captured by
this metric will be captured by these other modes. As for concerns
about aggregation and usage profiles, DOE notes that it will address
these issues in greater detail in the related standards rulemaking that
is currently underway. See 75 FR 56021 (Sept. 15, 2010).
b. Charge Test Duration
Charge test duration issues involved two primary areas. First,
commenters provided feedback on DOE's proposal to shorten the procedure
for certain products. Second, commenters also provided feedback on
DOE's proposal to have indicators to help provide some means for a
tester to determine the appropriate duration of a test. These issues
are discussed in greater detail below.
Shortened Test Procedure
In the NOPR, DOE considered permitting a shortened test procedure
for those products that stabilized (i.e. reached steady-state in
maintenance mode) in less than 24 hours. This approach would have
modified the procedure contained in the CEC test procedure. See part 1,
section II.E of the CEC test procedure. Shortening the active mode test
by terminating it once the charger has entered steady state operation
could result in decreased testing time and decreased burden on
manufacturers. DOE proposed this approach to reduce the testing burden
faced by at least some manufacturers from the 24-hour charge test. 75
FR 16958, 16970.
PG&E stated that the 24-hour test is not more burdensome than the
proposed shortened test. Under the longer 24-hour test, technicians
would be able to leave the test setup over night and begin a new test
the next day, which is likely to be the same even if the test is
shortened. (PG&E, Pub. Mtg. Tran., No. 2 at pp. 167-168) PTI commented
that while it may be convenient for DOE to offer a shortened test
procedure, the full test procedure will need to be used for
verification purposes. (PTI, Pub. Mtg. Tran., No. 2 at p. 162) ASAP,
PG&E, and SCE argued that a 24-hour active and maintenance mode test is
the shortest permissible period that should be employed because it will
allow the technician to see additional shifts in battery charger
behavior that may have otherwise been missed because the charger
entered a steady-state that was not necessarily maintenance mode early
on during the test period. (ASAP, No. 11
[[Page 31767]]
at p. 7; PG&E, No. 12 at p. 7; SCE, No. 13 at p. 7)
Alternatively, some interested parties supported the shortened test
method approach. AHAM argued that the shortened test is acceptable if
the test record shows that it was used, and manufacturers understand
that the 24-hour test will be used for verification. (AHAM, Pub. Mtg.
Tran., No. 2 at pp. 169-170) AHAM further stated that if a manufacturer
knows that the shortened test procedure will accurately test their
product, it should be able to use it so long as the manufacturer
clearly states in the test record that it was used. (AHAM, Pub. Mtg.
Tran., No. 2 at pp. 164-165) For manufacturers with products that have
short charge times, the shortened test can provide value by enabling a
tester to complete multiple testing cycles within a normal testing day.
(AHAM, Pub. Mtg. Tran., No. 2 at pp. 168-169) AHAM noted that if the
shortened test procedure yields the same results as the 24-hour test
procedure, manufacturers should be permitted to use that procedure so
long as the 24-hour test procedure will be used for verification
purposes. (AHAM, No. 10 at pp. 6-7) AHAM emphasized that it is crucial
that the test procedures be accurate, and that there be no opportunity
for a certifying laboratory to conduct a test one way, and a verifying
laboratory to conduct it a different way, with the two laboratories
obtaining different results. (AHAM, Pub. Mtg. Tran., No. 2 at p. 26)
Delta-Q, in general, agreed with the proposed shortened test procedure.
It noted that more advanced chargers may be programmed to pass the
shortened test by inhibiting any energy-consuming modes for the
duration of the test. (Delta-Q, No. 11 at p. 2). Sony opposed the 24-
hour charge test duration, stating that it is neither cost effective
nor efficient. It suggested adding the following statement: ``If the
battery charger has an indicator to show that the battery is fully
charged, [the discharge] test can begin as soon as the indicator shows
that the battery is fully charged.'' Alternatively, Sony recommended
that DOE shorten the charge test duration from 24 hours to 12 hours.
(Sony, No. 6 at p. 2)
DOE is dropping its initial proposal for a shortened test period.
As indicated by the submitted comments, manufacturers were wary of
the proposal since it could cause issues with verification testing of
products. In particular, not all battery chargers behave the same way
in maintenance mode. Some chargers may ``wake up'' and have periods of
high input current to top off the battery's charge level if the battery
has self-discharged after sitting without being used for an extended
period of time. Measuring the energy consumption of products employing
this type of feature under these conditions could miss these ``wake
up'' periods if a shortened test duration is used. When DOE conducted
testing according to the shortened test procedure, it also found that
it can be difficult to determine when the product reaches steady state,
which serves as the point at which the test should end. (Battery
Charger Test Data, No. 18.3) Furthermore, adopting the shortened test
procedure could lead to complications due to the necessity of
reconciling two differing measurement results. Therefore, to ensure
there are no potential discrepancies or confusion, and in light of the
reliability and accuracy of a test with a longer duration, DOE is
declining to incorporate a shortened test procedure in this final rule.
Indicators
DOE proposed to have indicators, if present, to serve as a means to
help determine the length of the charge test. DOE proposed this
approach because it is consistent with the CEC test procedure (see
section II.E of part 1 of the CEC test procedure) and provides a clear
means for technicians to determine when the battery has been fully
charged. In using this approach, DOE proposed that if the indicator
shows that the battery is fully charged after 19 hours of charging, the
test shall terminate once 24 hours have elapsed. Conversely, if the
full-charge indicator does not indicate that a full charge has been
reached after 19 hours of charging, the test shall continue up until 5
hours after the indicator has illuminated or otherwise indicates that
the battery has been fully charged. 75 FR 16958, 16983.
ASAP, PG&E, and SCE commented that charger indicator lights are not
reliable and consistent sources of information about the state of
charge of the battery. They added, though, that these lights are useful
for general guidance on the state of charge for the purpose of
determining a charger's active mode test length. (ASAP, No. 11 at p.
13; PG&E, No. 12 at p. 13; SCE, No. 13 at p. 13) Despite their
collective objection to DOE's proposed approach, these interested
parties did not suggest changing the proposed test duration selection
process. (ASAP, No. 11 at p. 13; PG&E, No. 12 at p. 13; SCE, No. 13 at
p. 13)
After considering these comments, DOE is adopting its proposed
approach to permit the use of indicators to help determine a battery's
state of charge. DOE notes that a testing technician is not restricted
to the use of indicator lights, but may rely on any indicator that is a
part of the UUT that would help in determining a battery's state of
charge. DOE believes that indicators are sufficiently informative to
determine the charge test duration of a battery because, as commenters
conceded, they are useful in providing information regarding the
general state of a battery's charge. Because the charge and maintenance
mode test will not be shortened, DOE believes that the information
conveyed by an indicator about the general state of a battery's charge
is all that is necessary for the purposes of testing. Furthermore, the
vast majority of battery chargers currently available on the market
will likely finish charging well before the 19 hour mark that must be
met in order to complete the test within 24 hours. (Battery Charger
Test Data, No. 18.3) Therefore, up-to-the-minute precision regarding
when the battery has reached its full charge state is not necessary for
the vast majority of products. This change will not only provide
testers with a straight-forward guide when determining a battery's
state of charge, but will also help to ensure consistency with the
established CEC test procedure that the industry is already following.
c. Testing Order
The CEC test procedure requires that the test be conducted by
performing first a preparatory discharge followed by a measured charge
and then a measured discharge. See section III of part 1 of the CEC
test procedure. DOE proposed to reverse this testing order by requiring
a preparatory charge first, followed by a measured discharge and
measured charge. 75 FR 16971. As explained below, interested parties
generally opposed this proposed approach.
PG&E stated that if DOE adopts its proposal to reverse the CEC
testing order, the procedure will not accurately measure the energy
consumption of battery chargers that take longer than 24 hours to
charge. If the battery is discharged completely during the 5 hour
discharge test, and then is not fully charged within 24 hours, the test
does not account for a complete ``round-trip'' (i.e., a complete
charge-discharge or discharge-charge cycle). PG&E recommended that DOE
either prove a round-trip has been accomplished under its proposed
approach or adopt the CEC method. (PG&E, Pub. Mtg. Tran., No. 2 at pp.
16-18; PG&E, Pub. Mtg. Tran., No. 2 at pp. 135-136)
PG&E further stated that reversing the testing order creates a
loophole that can encourage manufacturers to make slow charging
products that will appear more
[[Page 31768]]
efficient than they actually are since the reversed testing order will
account for a full discharge but only a partial charge for these
products. PG&E encouraged DOE to ensure that its final procedure
includes a valid method to measure the energy consumption of battery
chargers that take longer than 24 hours to charge. (PG&E, Pub. Mtg.
Tran., No. 2 at pp. 140-141; PG&E, Pub. Mtg. Tran., No. 2 at pp. 143-
144). ASAP objected to reversing the charge/discharge order detailed in
the CEC procedure. (ASAP, No. 11 at p. 8; PG&E, No. 12 at p. 8; SCE,
No. 13 at p. 8) ASAP, PG&E, and SCE added that the reversed testing
order was found to give inaccurate and inconsistent results for a
significant number of products that were tested. (ASAP, No. 11 at p. 8;
PG&E, No. 12 at p. 8; SCE, No. 13 at p. 8) In their view, the reversed
testing order does not accurately test batteries that take longer than
24 hours to charge, which includes batteries used with emergency
systems (e.g. computer uninterruptible power supplies, security
systems, exit lighting, and other power backup applications), small
automotive type chargers, and many universal chargers for C-size of D-
size batteries. (ASAP, No. 11 at p. 8; PG&E, No. 12 at p. 8; SCE, No.
13 at p. 8) These commenters also contended that retaining the proposed
reversed CEC testing order may create an incentive for manufacturers to
redesign their products to charge for longer periods of time rather
than making the product more efficient, since the test procedure will
record a full discharge, and only a partial charge. (ASAP, No. 11 at p.
9; PG&E, No. 12 at p. 9; SCE, No. 13 at p. 9) By doing so,
manufacturers could inflate the efficiency of their products and
effectively circumvent any energy conservation standards that DOE may
establish.
Similarly, AHAM commented that if reversing the testing cycle
causes errors with accuracy, the Department should consider
alternatives. (AHAM, Pub. Mtg. Tran., No. 2 at p. 139) However, AHAM
also commented that DOE's proposal to reverse the CEC testing order
will result in some time savings without any loss of accuracy. (AHAM,
No. 10 at p. 5) Delta-Q expressed support for incorporating a reversed
order from the CEC procedure and noted that it follows this reversed-
order approach when conducting all battery cycle test measurements.
(Delta-Q, No. 5 at p. 2).
Euro-Pro made an alternative suggestion, requesting that DOE
consider modifying its proposal to permit the tester to monitor the
battery voltage either during charging or at the end of the charge, and
terminate the test when the battery is discharged, regardless of the
time needed for a complete discharge to occur. (Euro-Pro, Pub. Mtg.
Tran., No. 2 at pp. 142-143)
Sony sought clarification on whether the proposed reversing of the
CEC test procedure would impact the testing duration or burden. (Sony,
No. 6 at p. 2)
DOE made its proposal to allow the preparatory step to be a charge
rather than a discharge. By permitting this step, preparation could be
conducted within the UUT, rather than using a battery analyzer, which
would in turn reduce the amount of required testing equipment time that
a manufacturer would need to allocate while testing. DOE had believed
that following this approach would reduce the overall testing burden
without impacting accuracy. 75 FR 16958, 16971.
However, after considering the comments submitted on this issue,
DOE recognizes the merits of the concerns expressed by interested
parties that the proposed test procedure may not capture a full round-
trip for some battery chargers. Completing a full round trip is
critical to accurately measuring the energy consumption of a battery
charger because it prevents the possibility of obtaining results that
suggest that more energy came out of the battery then went into the
battery, a physical impossibility with a full charge and discharge. As
mentioned above, commenters indicated that this problem may be
prevalent with numerous products such as an uninterruptible power
supply or universal battery charger that takes longer than 24 hours to
charge its battery. (ASAP, No. 11 at p. 8; PG&E, No. 12 at p. 8; SCE,
No. 13 at p. 8) Furthermore, the potential measurement error caused by
the proposed change could be exploited by some manufacturers as a
loophole, which could occur if the 5-hour discharge test recovered all
energy from the battery and the subsequent charge test captured only
the energy flowing into the battery during the first 24 hours. Under
this scenario, the test would capture only a portion of the energy
consumed by the charger. Finally, DOE believes that preserving the
proposed testing order while adding steps to ensure that a battery is
not overcharged, like the steps suggested by Euro-Pro, would increase
test procedure complexity and burden since it would require a
technician to continuously monitor the battery for 24 hours or longer
to determine when the battery has reached a fully charged state. For
these reasons, DOE is modifying the approach presented in its proposal
and adopting the order prescribed in the CEC test procedure--i.e.
preparatory discharge, measured charge, measured discharge.
d. End-of-Discharge Voltages
DOE proposed end-of-discharge voltages for both popular and novel
battery chemistries. 75 FR 16958, 16984. In its notice, DOE proposed
that the test procedure incorporate an end-of-discharge voltage of 2.5
volts per battery cell. DOE made this proposal in order to provide
guidance on the recommended voltage to stop the discharging process to
avoid damaging the battery. Responses to this aspect of the proposal
were mixed.
ASAP, PG&E and SCE offered support for ``DOE's effort to include
battery charger systems with novel chemistries in the test procedure,''
as well as ``DOE's effort to identify batteries that are in the lab now
and might become commercialized over the coming years.'' (ASAP, No. 11
at p. 9; PG&E, No. 12 at p. 9; SCE, No. 13 at p. 9)
On the other hand, AHAM commented that the proposed end-of-
discharge voltages were not consistent with manufacturer
specifications, noting in particular that most lithium ion battery
manufacturers do not recommend discharging below 3.0 volts per cell.
(AHAM, Pub. Mtg. Tran., No. 2 at p. 147) AHAM further stated that some
manufacturers do not design the battery with protective circuitry and
discharging to too low of a level will damage the battery. (AHAM, Pub.
Mtg. Tran., No. 2 at p. 151) Euro-Pro agreed with AHAM and noted that
some products stop operating after a certain amount of time and do not
reach the end-of-discharge voltage level. (Euro-Pro, Pub. Mtg. Tran.,
No. 2 at p. 150) PTI's main concern was that if the test is terminated
at a predetermined voltage, even if that predetermined voltage is set
by surrounding circuitry, as long as the battery is returned back to
that same voltage, this method would complete a round trip. (PTI, Pub.
Mtg. Tran., No. 2 sheet at p. 181)
On the issue of novel battery chemistries, commenters stated that
because the test procedure would likely be reviewed on a seven-year
cycle, DOE should have an approach to address those battery cells that
had not been previously contemplated. (PTI, Pub. Mtg. Tran., No. 2 at
p. 152) PTI urged DOE to consider accepting ``cell manufacturer
published values for recommended cutoff voltages'' and ``permitting
future chemistries to be considered under the test procedure without
having to revise it.'' (PTI, Pub. Mtg. Tran., No. 2 at p. 154). AHAM
also commented that the proposed end-of-discharge voltages only apply
to units
[[Page 31769]]
without electronic cycle termination and that new battery chemistries
were not included as part of the end-of-discharge table. AHAM asserted
that DOE's proposed end-of-discharge voltage table should only be used
as a guide and that testing should use the manufacturer's stated end-
of-discharge values, which usually stem from recommendations received
from the battery manufacturer. Alternatively, AHAM also suggested that
relevant IEC cell standards could be used as a reference. For example,
it asserted that DOE should allow manufacturers to place battery
capacity information on their Web sites, specification sheets, or
instructions shipped with the product. In AHAM's view, this flexibility
would help better handle situations where new battery chemistries are
introduced and appropriate end-of-discharge voltages are not known,
without which, damage could be done to the battery during testing.
(AHAM, No. 10 at p. 6; AHAM, Pub. Mtg. Tran., No. 2 at p. 156)
In today's final rule, DOE is opting to maintain its end-of-
discharge voltage table as proposed in the NOPR. 75 FR 16984. DOE
believes that it is prudent to have a consistent cut-off voltage across
chemistries because this voltage will affect the amount of energy that
is measured coming out of the battery. This energy represents a
fundamental measurement and key output of the test procedure. Given the
outlined approach, deferring to a manufacturer's stated end-of-
discharge values that are provided on an individual product basis may
not provide this type of consistency. Accordingly, today's final rule
adopts the end of discharge voltages from the CEC test procedure, since
they are widely accepted and already in use by the industry. In
addition to the chemistries listed in the CEC table, DOE specified end-
of-discharge voltages for two novel chemistries (Nanophosphate Lithium
Ion and Silver Zinc). DOE is aware of the existence of these particular
chemistries and their potential for more widespread use. DOE is
including these two chemistries to ensure that its test procedure can
adequately address products that employ batteries that rely on these
chemistries.
With respect to discharging, AHAM and Euro-Pro commented that
manufacturers often do not discharge their products to the IEC
specified end-of-discharge voltage, which were used in the proposed
test procedure. AHAM further commented that the test procedure should
allow manufacturers to specify their own end-of discharge voltages
during testing.
DOE believes that adopting this approach would lead to inconsistent
testing between similar batteries, since manufacturers will be more
likely to specify different voltages of batteries that are of similar
make and chemistry. Because of the potential problems that could result
from having inconsistent testing methods between similar batteries,
such as measuring vastly different amounts of energy coming from
similar batteries, DOE is declining to adopt the particular measures
suggested by AHAM.
DOE notes, however, that some batteries, particularly those using
the more unstable lithium-ion chemistry (compared to nickel-based
batteries), should not be discharged past a certain voltage for safety
reasons. (Discharging of these types of batteries beyond a certain
point may result in the risk of fire.) For most products using these
types of batteries, manufacturers will provide protection circuitry
within the lithium-ion battery pack that will stop the discharge at a
safe voltage, regardless of the end-of-discharge voltage, to ensure a
safe discharge. DOE is aware that since these mechanisms are bypassed
during the test procedure, an overly low end-of-discharge voltage could
present a safety risk in this case.
AHAM commented that most manufacturers do not recommend discharging
lithium batteries below 3.0 V. It identified Sony and Black & Decker as
examples of manufacturers who make this recommendation. However, DOE
has consulted with subject matter experts regarding this issue who
believe that lithium-ion batteries will not experience safety issues if
discharged to the end-of-discharge voltage of 2.5 V. (Comment
pertaining to batteries being used as a part of the test equipment to
test a charger, No. 18.1) While conducting tests on lithium-ion
batteries over the years, including the tests done for the Department,
DOE's subject matter expert has not experienced any safety issues when
discharging lithium-ion batteries to 2.5 V. (Battery Charger Test Data,
No. 18.3) Additionally, AHAM did not provide any data to support its
claim. Consequently, DOE will adopt the 2.5 V end-of-discharge voltage,
consistent with that proposed in its NOPR, in this final rule. This
end-of-discharge voltage is accepted in industry and should not create
any appreciable testing burden for manufacturers.
e. E24 Measurement
DOE proposed measuring only the energy consumed during the first 24
hours of charging, even if the test lasts longer than 24 hours. 75 FR
16958, 16984. DOE proposed this approach because it believed that most
products could be charged within the 24-hour time period, and for those
products that took longer to charge, most of the energy consumption
would likely have been accounted for within the first 24 hours.
However, most commenters opposed this approach. PG&E commented that the
proposal only accounts for the energy used during the first 24 hours of
charging, which does not capture a full round-trip for batteries with
charge times that exceed 24 hours. (PG&E, Pub. Mtg. Tran., No. 2 at p.
22; PG&E, Pub. Mtg. Tran., No. 2 at p. 144) Instead, PG&E strongly
urged DOE to modify its test procedure to be consistent with the CEC
procedure by including (1) total charger input energy (Charge and
Maintenance Energy) accumulated over the entire duration of the test,
reported in watt-hours (Wh) and (2) total time duration of the charging
test (at least 24 hours).'' (ASAP, No. 11 at pp. 12-13; PG&E, No. 12 at
pp. 12-13; SCE, No. 13 at pp. 12-13) ASAP, PG&E, and SCE supported this
view by commenting that batteries that take longer than 24 hours to
charge will not reach a fully charged state during the 24-hour charge
test, which will result in energy use measurements that significantly
underestimate the energy required to charge the battery and can result
in inflated efficiency levels exceeding 100 percent. (ASAP, No. 11 at
p. 9; PG&E, No. 12 at p. 9; SCE, No. 13 at p. 9)
AHAM supported the proposed E24 measurement. (AHAM, No.
10 at p. 5) No other comments were received on this issue.
DOE's proposed test method would have required measuring a full
discharge and the energy consumed during the first 24 hours of the
charge. As interested parties noted, if the test procedure only
accounts for the energy to charge the battery over the first 24 hours,
it would not capture a full ``round-trip'' for those battery chargers
taking longer than 24 hours to charge.
Even though the most common products that require more than 24
hours to charge do not account for a large portion of shipments, these
products will not be accurately tested and may result in reporting
efficiencies greater than 100 percent if the measurement period is only
24 hours. While DOE acknowledges that varying the test duration may
create a less than uniform approach as well as a potentially increased
testing burden, the need to obtain accurate results is critical to
ensure the viability of not only the procedure that DOE adopts for all
manufacturers to use, but also to help ensure the integrity of whatever
energy
[[Page 31770]]
conservation standards that DOE may set for these products. Therefore,
to make certain that accurate results are obtained, DOE is modifying
its proposal by requiring that the full round-trip be accounted during
testing and that the measurements are taken over the entire duration of
the charge test, even if that time period exceeds 24 hours.
C. Review of Battery Charger and External Power Supply Standby and Off
Mode Test Procedures
1. Battery Charger Test Procedure Off Mode Definition
DOE sought comments on the existing standby and off mode test
procedures for battery chargers. 75 FR 16958, 16962. Section 2.k. of
appendix Y defines off mode as: ``The condition, applicable only to
units with manual on-off switches, in which the battery charger is (1)
connected to the main electricity supply; (2) is not connected to the
battery; and (3) all manual on-off switches are turned off.''
DOE received comments with regard to this proposed definition and
how it applies to integral batteries in the off mode test procedure.
PG&E suggested that the off-mode definition should be rewritten to
allow off mode to be measured even if the battery is internal and
cannot be removed. (PG&E, Pub. Mtg. Tran., No. 2 at pp. 23-24) PG&E
added that a large number of battery chargers can have an off mode even
if the battery is still connected, noting that battery chargers can be
equipped with an on/off switch. ASAP, PG&E, and SCE cited a computer
UPS as an example of a such charger in which the battery is not usually
removed, but is equipped with an on-off switch. (ASAP, No. 11 at p. 13;
PG&E, No. 12 at p. 13; SCE, No. 13 at p. 13) PG&E added that the off
mode of these types of chargers should be tested even if the battery
cannot be disconnected. (PG&E, Pub. Mtg. Tran., No. 2 at p. 188)
Therefore, ASAP, PG&E, and SCE all recommended that off mode be tested
for all battery chargers with an on-off switch. (ASAP, No. 11 at p. 13;
PG&E, No. 12 at p. 13; SCE, No. 13 at p. 13).
Section 310 of EISA 2007 defined ``off mode'' as ``the condition in
which an energy-using product-(I) is connected to a main power source;
and (II) is not providing any standby or active mode function.'' (42
U.S.C. 6295 (gg)(1)(A)(ii)) For the purposes of this test procedure,
the ``energy-using product'' is the battery charger itself and not the
end-use product into which that battery charger is integrated. This
distinction is important to note because on-off switches are frequently
used for the end-use product and not the battery charger. Therefore, to
be completely unambiguous and ensure that only off mode power for the
battery charger. and not the end-use product, is being measured, DOE
believes it is necessary that the battery must be detachable from the
end-use product. By removing the battery from the battery charger, the
technician can be certain that any power consumed by the battery
charger is not attributable to any standby or active mode function that
the battery charger may have otherwise still been providing despite
turning off the end-use product. Consequently, DOE is declining to
expand its definition of off mode to encompass products with non-
detachable batteries.
2. Test Duration
DOE proposed to shorten the current warm-up period from one hour to
30 minutes used in the standby and off mode test procedures. Compare 10
CFR part 430, subpart B, appendix Y, sec. (c)(1) with 75 FR 16985
(proposed sections 5.11 and 5.12). Additionally, DOE proposed to have
this 30-minute warm-up period followed by a 10-minute measurement
period. DOE proposed this approach, in part, to help harmonize DOE's
standby and off mode measurement procedures with sections IV.B and IV.C
in part 1 of the CEC test procedure and to reduce testing burden while
maintaining accuracy. 75 FR 16958, 16962.
Commenters had varying opinions on the issue. Delta-Q ``mildly
agreed'' with the proposed changes to standby and off mode duration and
believed that there would be no significant impact from the proposed
change. (Delta-Q, No. 5 at p. 2) Alternatively, AHAM suggested that the
warm-up period should last an hour to maintain the accuracy of the
data. (AHAM, No. 10 at p. 7)
As stated in the NOPR, abbreviating the measurement period from 1
hour to 10 minutes will not affect the accuracy of the test because the
amended test procedures would retain a 30-minute warm up period.
Variations in component efficiency due to temperature are the most
common reason for changes in battery charger energy consumption in
standby and off modes, and the 30-minute warm-up period will remain
sufficient to permit the input power of most battery chargers to
stabilize. 75 FR 16958, 16962. DOE recognizes that further
instabilities (pulses) in energy consumption in standby and off modes
may be caused by periodic operation of certain battery charger
functions, as when a battery charger occasionally checks its output for
the presence of the battery. In general, there is always a potential
for a time-limited test procedure to fail to capture a behavior
occurring at an arbitrary time. DOE has conducted numerous tests to
analyze this issue and has not encountered any cases where the product
does not stabilize within the allotted 30-minute time period. (Battery
Charger Standby Tests, No. 18.2) Accordingly, DOE believes that the 30-
minute warm-up period is sufficient for testing battery chargers and is
adopting its proposed approach in today's final rule.
D. Review of the Single-Voltage External Power Supply Test Procedure
1. External Power Supplies That Communicate With Their Loads
DOE requested comments on testing external power supplies that
communicate with their loads, specifically with regard to allowing
manufacturers to supply test jigs (i.e., physical connection adapters
to permit testers to help identify which electrical leads to use when
taking a measurement) to properly measure these products. 75 FR 16973
and 16979. ASAP, PG&E, and SCE recommended that DOE create a standard
test jig for external power supplies that communicate with their loads
via USB protocol and that manufacturers supply test jigs for non-
standard protocols. (ASAP, No. 11 at p. 14; PG&E, No. 12 at p. 14; SCE,
No. 13 at p. 14) They also recommended that for proprietary or custom
communication protocols, manufacturers should submit an external power
supply test jig so that the product can be tested and will not be
exempt from the standard because it cannot be tested. In their view, if
the jig is not supplied, the efficiency value should be zero, and the
external power supply would not meet the standard. (ASAP, No. 11 at p.
14; PG&E, No. 12 at p. 14; SCE, No. 13 at p. 14). Alternatively, Sony
recommended excluding USBs from the external power supply test
procedure because including them would result in additional burden and
increased testing costs to manufacturers. (Sony, No. 6 at p. 2).
DOE notes that to the extent that a particular product cannot be
tested under the prescribed procedure, a manufacturer would be able to
seek a test procedure waiver in order to be able to test and rate that
product. See 10 CFR 430.27. Without such a rating, a manufacturer would
be unable to sell that product in the United States. 42 U.S.C.
6302(a)(5). With respect to the final rule DOE is adopting today, the
test procedure will permit manufacturers to supply test jigs that
[[Page 31771]]
can accurately measure the energy consumption of their external power
supplies. It is DOE's understanding that these jigs are straightforward
adapters that would allow technicians to determine which output
connectors from the external power supply are providing output power.
These jigs would also allow the technician to simulate normal operating
conditions if any communication with the device is necessary. DOE does
not believe that the allowance of such devices will lead to gaming of
the test procedure because the jig should be a simple, non-powered
device. This approach is preferable to the approach suggested by Sony
because it avoids the exclusion of products from coverage. This
approach will also ensure that DOE obtains accurate and consistent test
results and allows products to be tested that otherwise might have
required waivers.
2. External Power Supplies With Output Current Limiting
DOE sought comment regarding the treatment of external power
supplies with an output current limiting capability. ``Output current
limiting'' is a mode of operation where an external power supply
significantly lowers its output voltage once an internal output limit
has been exceeded. These external power supplies cannot be loaded at
100 percent of rated nameplate output current. 75 FR 16958, 16962.
PTI offered two recommendations on this issue. First, it
recommended that DOE require that the measurement be made and recorded
at a 100 percent load. (PTI, Pub. Mtg. Tran., No. 2 at p. 196) Second,
PTI recommended that if the external power supply cannot be loaded at
the 100 percent load point then it should not be tested at that load
point. (PTI, Pub. Mtg. Tran., No. 2 at p. 204) PTI did not offer an
appropriate load point under that scenario. ASAP, PG&E and SCE
recommended that DOE alter its proposal and require testing of external
power supplies with lower than expected output current limiting levels
at three standard load points (25, 50, and 75 percent) and include an
option to modify the 100 percent load point to 95 percent. These
commenters believe that the 95 percent option will account for some
manufacturer variation that might exist because of current limiting
circuitry that is occasionally present in external power supplies to
prevent a short circuit. (ASAP, No. 11 at p. 15; PG&E, No. 12 at p. 15;
SCE, No. 13 at p. 15)
SAP, PG&E and SCE recommended that the following approach should be
used (ASAP, No. 11 at p. 15; SCE, No. 13 at p. 15; PG&E, No. 12 at p.
15):
(1) After the warm-up, load the product at 100 percent of rated
output current.
(2) If the external power supply will not supply 100 percent of the
nameplate output current (assumed because of the current limiting
function), then the external power supply shall be tested at 95 percent
rated output current.
(3) If the external power supply supplies current at 95 percent
rated output current, then the efficiency at the 100 percent loading
point shall be recorded as the efficiency at the 95 percent loading
point to permit some variation.
(4) If the external power supply will not supply 100 percent or 95
percent of the rated output current, then the efficiency measured at
100 percent shall be recorded as 0.
(5) Move on to other loading points (75, 50, and 25) in the
procedure. If the external power supply cannot supply current at the
other loading points, they should all be marked 0.
PTI commented that external power supplies that do not reach 100
percent load are likely designed to ensure that they are not affected
by the early cutoff of the wall adapter. They likely only make
excursions at those current levels on a transitory basis. (PTI, Pub.
Mtg. Tran., No. 2 at p. 203) PTI added that it is possible that wall
adapters that are unable to meet 100 percent of nameplate output power
had charge control and were not external power supplies. (PTI, Pub.
Mtg. Tran., No. 2 at. 199) Alternatively, AHAM informed DOE that some
external power supplies will not reach 100 percent because the
manufacturer rates them higher to reach a maximum value for temperature
purposes such that the product will never reach the value under the
worst situations. (AHAM, Pub. Mtg. Tran., No. 2 at p. 201) AHAM further
commented that nameplate ratings are not used for energy efficiency
purposes, but for safety certification. (AHAM, Pub. Mtg. Tran., No. 2
at pp. 200-201)
If an external power supply cannot sustain output current at 100
percent load during testing, then it will not operate at 100 percent
load with its associated application. Incorporating the 100 percent
loading point into the metric for these units would be inconsistent
with how they are used in consumer environments. Therefore, DOE is not
requiring an efficiency measurement at that loading point as part of
the average efficiency metric. Instead, the average efficiency of
products that cannot maintain 100 percent output load will be the
average of the efficiencies at 25 percent, 50 percent, and 75 percent
of full load only. Appropriate changes to section 4(a)(i) of appendix Z
to subpart B of part 430 have been made for today's final rule.
3. High-Power External Power Supplies
As mentioned above, the current external power supply test
procedure in appendix Z requires the nameplate output current to be
used to calculate the loading points for efficiency measurements. See
section 4(a)(i) of Appendix Z to subpart B of part 430 (referencing
CEC's ``Test Method for Calculating the Energy Efficiency of Single-
Voltage External Ac-Dc and Ac-Ac Power supplies''). DOE sought comments
on what should be done in those instances where a manufacturer lists
more than one maximum output power for a given high-power external
power supply. In particular, DOE sought comment on whether it should
modify the definition of ``output power'' to specify that the
continuous output current should be used when more than one maximum
output is provided.
ASAP, PG&E, and SCE recommended that DOE test both intermittent and
continuous load conditions for high power external power supplies. They
commented that when ham radios (amateur wireless radios) are
transmitting, the higher (intermittent) rating is more applicable, and
when the radio is receiving, the lower (continuous) rating is more
applicable. They believe that the intermittent portion of the external
power supply may be used from 20 percent to 50 percent of the time,
which, in their view, constitutes a significant portion of operating
time. (ASAP, No. 11 at p. 16; PG&E, No. 12 at p. 16; SCE, No. 13 at p.
16)
DOE notes that testing a high-power external power supply at its
advertised intermittent output power would be inconsistent with its
typical use, since the external power supply test procedure requires
operating the external power supply at full load for 30 minutes,
whereas the high-power external power supply only operates at
intermittent output power for substantially shorter periods of time.
Further, DOE believes that operating the external power supply for 30
minutes at its intermittent output power might damage the external
power supply due to overheating, because the external power supply is
only designed to operate at the higher level for brief intermittent
intervals. Therefore, in the case where more than one output current is
listed, DOE is requiring that the external power supply be tested at
only the continuous loading conditions.
[[Page 31772]]
4. Active Power
DOE proposed to incorporate a definition for battery charger
``active power'' into section 2 of appendix Y. 75 FR 16958, 16973. This
definition would provide that ``active power'' as meaning ``the average
power consumed by a unit.'' Id. at 16980. DOE proposed this definition
because of related proposals to measure the power consumption of a
battery charger during active mode. DOE did not receive any comments on
the definition it proposed in its NOPR. Therefore, in the absence of
any comments, and to ensure the viability and completeness of the
active mode procedure, DOE is incorporating its proposed definition
into its regulations.
E. Multiple-Voltage External Power Supply Test Procedure
In 2008, DOE first proposed a test procedure for multiple-voltage
external power supplies as part of its NOPR test procedure for standby
and off modes for single-voltage external power supplies. See 73 FR
48054. That proposal detailed an approach that would have required
measuring efficiency levels at no-load, 25 percent, 50 percent, 75
percent, and 100 percent of nameplate output, but result in a single
average efficiency measurement. Id. at 48082. In 2009, DOE finalized
its test procedure for standby and off modes, but in light of
substantial concerns raised by commenters, it did not incorporate a
procedure to accommodate multiple-voltage external power supplies. See
74 FR 13318, 13322. DOE re-proposed the incorporation of a multiple-
voltage external power supply procedure as part of this rulemaking
proposal. This more recent proposal specified an approach that would
require measurements at each loading point. 75 FR 16958, 16974.
PG&E supported the creation of a separate multi-voltage external
power supply test procedure so long as it would not impact the current
single-voltage external power supply test procedure already in use.
(PG&E, No. 2 at p. 15) ASAP, SCE, and PG&E also accepted DOE's proposed
measurement and reporting method for multiple-voltage output external
power supplies, but encouraged DOE to evenly weight the 25-percent, 50-
percent, 75-percent, and 100-percent loading conditions in any
forthcoming standards. (ASAP, No. 11 at p. 16; SCE, No. 13 at p. 16;
PG&E, No. 12 at p. 16)
AHAM objected to DOE's proposal to report five efficiency metrics
for external power supplies without aggregating them. (AHAM, No. 2 at
p. 211) AHAM further commented ``* * * `a test procedure for covered
products should measure energy efficiency,' '' and that this action is
inconsistent with the direction of section 323 of EPCA. (AHAM, No. 2 at
p. 219). AHAM also commented that it may make more sense to measure
multiple-voltage external power supplies at values representative of
typical loading rather than 25, 50, 75, and 100 percent of full load.
(AHAM, No. 2 at pp. 212-213)
Although AHAM expressed concern over the multiple-voltage test
procedure, outputting separate metrics creates a method similar to that
for battery chargers. Adopting an approach that parallels the battery
charger method is preferable because of the similar nature of these two
products and the potential variation of use from consumer to consumer
that can be expected. Again, as with the battery charger test procedure
(see section III.B.5.a), DOE may combine them for purposes of
determining compliance with any energy conservation standard that may
be set.
F. Test Procedure Amendments Not Incorporated in this Final Rule
1. Incorporating Usage Profiles
DOE proposed to amend the battery charger test procedure to measure
energy consumption in each mode, which would more readily permit
comparisons between a greater number of test results. 75 FR 16958,
16974.
PG&E supported this approach and stated that DOE is moving in the
right direction by outputting multiple measures rather than a single
one because this allows the different usage of products to be taken
into account. (PG&E, Pub. Mtg. Tran., No. 2 at p. 51). PG&E also
commented that having multiple outputs may create a test procedure that
can easily be harmonized across jurisdictions. (PG&E, Pub. Mtg. Tran.,
No. 2 at pp. 14-15) Similarly, ASAP, PG&E, and SCE supported DOE's
approach. (ASAP, No. 11 at p. 13; PG&E, No. 12 at p. 13; SCE, No. 13 at
p. 13)
Other commenters preferred that the test procedure combine all
measurements into a single metric. AHAM stated that DOE should
integrate energy consumption from active, maintenance, and no-battery
mode through usage factors required by law. (AHAM, Pub. Mtg. Tran., No.
2 at p. 48) AHAM also supported incorporating usage profiles, stating
that having one value will help a consumer to choose between product A
and product B based on energy efficiency. (AHAM, Pub. Mtg. Tran., No. 2
at p. 56) AHAM commented that ``it is incumbent upon DOE to make
available an aggregate energy use number of the energy use or energy
efficiency of a battery charger that is ` * * * representative of
typical use.' '' (AHAM, No. 10 at p. 3) AHAM noted that, in reference
to the periodic (seven-year) review of a given test procedure that DOE
must conduct in accordance with 42 U.S.C. 6293(b), the procedure should
include usage factors in order to improve the current procedure and to
allow the test procedure to stand for seven more years. (AHAM, No. 10
at p. 3) ``All energy from active, maintenance, and no-battery modes
should have factors of usage applied to them and then aggregated to
arrive at one value.'' (AHAM, No. 10 at p. 3)
PTI commented that the disaggregated data do not represent the
typical use of the product as accurately as a combined metric would.
(PTI, Pub. Mtg. Tran., No. 2 at p. 48) PTI preferred that the test
procedure result in a metric that tells the consumer something about
the overall efficiency of the product, because, when it becomes
effective, representations of energy use based on other test procedures
will become invalid. (PTI, Pub. Mtg. Tran., No. 2 at p. 50) PTI
commented that ``[w]hile active mode must be included in the test
procedure, it should be included in a manner that generates a
proportioned, aggregated value, consistent with the philosophy
expressed in the existing test procedure, and [be] in line with the
Department's obligation to produce a procedure that reflects typical
use.'' (PTI, No. 8 at p. 2) PTI further stated that an aggregation
``will not reflect every particular user, but would rather represent an
average of use. This [approach] would not be consistent with the
requirement to have the test procedure reflect `typical' use.'' (PTI,
No. 8 at p. 2) PTI suggested that DOE should ``have a series of ratios,
by product category, that can be used to aggregate the quantities in
the proposed test procedure.'' (PTI, No. 8 at p. 2) ``By DOE issuing
the current [proposed] test procedure as a national test, it permits
entities to use a test procedure in a manner that does not reflect
typical use or DOE's intent.'' (PTI, No. 8 at p. 2)
Phillips stated that the ``only way for the test procedure to be
representative of typical use is to have the test procedure utilize use
patterns of representative classes of battery chargers.'' (Phillips,
No. 7 at p. 2) Phillips also commented that it is essential that the
test procedure require the typical energy use factors established by
the Department for particular categories of products. (Phillips, No. 7
at p. 2) Phillips supported ``AHAM's position to have the test
procedure aggregate energy use
[[Page 31773]]
data.'' (Phillips, No. 7 at p. 3) According to Phillips, the ENERGY
STAR specifications for battery charger do not require measuring output
energy use in each mode, which it believes demonstrates that these
measurements are not of significant interest to consumers. (Phillips,
No. 7 at p. 3)
Wahl Clipper stated that the test procedure should measure the
energy consumption of products representative of typical use. This
measurement, in its view, should be an aggregated number of the active,
standby, and maintenance modes, which is representative of the typical
use for that product category. (Wahl Clipper, No. 9, at p. 1)
AHAM cited other test procedures and commented that for a number of
appliances, the usage factors are in the test procedure such that they
output one metric. Usage factors are used in this way in test
procedures for washing machines and refrigeration cycling, and are
being proposed for clothes dryers. (AHAM, Pub. Mtg. Tran., No. 2 at p.
58) AHAM specifically cited the clothes washer test procedure, from
which a single MEF (modified energy factor) value is derived that is
based on choices of cycles and percentage of wash loads going to a
dryer. The standard is then set against the MEF value. (AHAM, No. 10 at
p. 3)
PTI stated that the test procedure should indicate that it is
intended to be used with usage profiles in the standard to ensure that
the data are not misused. (PTI, Pub. Mtg. Tran., No. 2 at p. 172)
Phillips suggested that the battery charger usage profiles should
either be in the test procedure or the test procedure should include a
reference explaining that the usage factors are in the standard.
(Phillips, Pub. Mtg. Tran., No. 2 at p. 240) PTI added that DOE should
``indicate clearly that the test procedure is only intended to be used
with the suggested ratios and shall not be used until they become
available. As soon as the ratios are developed, DOE should update its
test procedure and reissue it with the ratios incorporated.'' (PTI, No.
8 at p. 2)
Commenters also expressed a variety of views regarding the
disseminating of product usage information. PG&E commented that
consumers know how they use their products. If the test procedure
outputs a separate metric for each mode, consumers will know which
number they should check when comparing energy consumption levels among
products. (PG&E, Pub. Mtg. Tran., No. 2 at p. 54) AHAM was concerned
that consumers may not know how their products are used and argued that
DOE should give the consumer a single value representing a product's
average, or approximate average, usage pattern. (AHAM, Pub. Mtg. Tran.,
No. 2 at p. 55) Usage factors applied against an aggregated value will
give the consumer accurate information on how the product is used.
(AHAM, Pub. Mtg. Tran., No. 2 at p. 53) PG&E similarly stated that
manufacturers may not be able to give accurate estimates of how much
time their product spends in each mode annually. (PG&E, Pub. Mtg.
Tran., No. 2 at p. 54) An aggregation based on calculated averages does
not, in its view, help the consumer determine what amount of energy
their particular usage pattern will consume. (PG&E, Pub. Mtg. Tran.,
No. 2 at p. 54) AHAM emphasized that consumers need a single piece of
information on energy efficiency so that products can be compared.
(AHAM, No. 10 at p. 3)
Phillips cited section 6 of the draft technical report that
accompanied the battery charger and external power supply framework
document and described the usage of its own products. Phillips
generally supported the approach taken by DOE to examine usage
patterns. It noted, in reference to its own products (notably, electric
shavers), that there cannot be a meaningful energy reduction for
products that ``have limited usage patterns [that spend] most, if not
close to all of their time in unplugged mode.'' (Phillips, No. 7 at p.
2)
DOE notes that the relevant statute permits DOE to promulgate a
test procedure that either produces measurements of energy use or
efficiency (neither of which would require usage profile data) or the
estimated annual operating cost of a product (which would require usage
profile data). Specifically, test procedures should ``be reasonably
designed to produce test results which measure energy efficiency,
energy use, water use (in the case of showerheads, faucets, water
closets, or urinals), or estimated annual operating cost of a covered
product under a representative average use cycle or period of use * *
*'' 42 U.S.C. 6293(b)(3) The procedure DOE is promulgating today
satisfies this requirement by producing a measurement of energy usage.
Accordingly, energy usage profiles, as suggested by some commenters,
are unnecessary for DOE to use in developing this test procedure.
2. Measuring Charger Output Energy
During the framework document public meeting, DOE suggested the
possible approach of including a procedure that would require measuring
the charger output energy rather than the battery output energy in
order to calculate the total energy consumed by the battery charger
during charging \16\ (Pub. Mtg. Tr., No. 14 at pp. 162-164). (DOE
believed at the time that measuring energy consumption at the charger
output, thereby bypassing the battery, could remove some of the
variability from the measurement. Commenters were unified in opposition
to this change and it was not proposed in the NOPR. During the NOPR
public meeting, AHAM agreed with DOE's decision to drop this approach.
(AHAM, No. 10 at p. 7)
---------------------------------------------------------------------------
\16\ A notation in the form ``Pub. Mtg. Tr., No. 14 at pp. 162-
164'' identifies DOE's explanation of this issue during the July 16,
2009, framework document public meeting. This explanation and
comments received were recorded in the public meeting transcript in
the docket of the BC and EPS energy conservation standards
rulemaking (Docket No. EERE-2008-BT- STD-0005, RIN 1904-AB57),
maintained in the Resource Room of the Building Technologies Program
and available at http://www1.eere.energy.gov/buildings/appliance_standards/residential/pdfs/bceps_standards_meeting_transcript.pdf.
---------------------------------------------------------------------------
3. Alternative Depth-of-Discharge Measurement
In its NOPR, DOE discussed the possibility of requiring that
battery chargers be tested with batteries at the 100 percent depth-of-
discharge level. 75 FR 16958, 16975. DOE proposed this approach in
response to comments that critiqued the initial approach DOE had
considered using, which DOE described during the framework document
public meeting (Pub. Mtg. Tr., No. 14 at pp. 162-164).\17\ During that
stage, DOE discussed the possibility of testing battery chargers with
batteries at 40 percent depth-of-discharge, meaning that they would
contain a 60 percent charge. Commenters opposed this earlier approach
because it would unnecessarily complicate the test procedure and be an
assumption of typical use that would be hard to substantiate. 75 FR
16958, 16975. See also Pub. Mtg. Tr., No. 14 at pp. 195-196, 199-200,
201, 206; PG&E et al., No. 20 at p. 16.\18\
---------------------------------------------------------------------------
\17\ U.S. Department of Energy-Office of Energy Efficiency and
Renewable Energy. Energy Conservation Program for Consumer Products
Energy Conservation Standards Rulemaking for Battery Chargers and
External Power Supplies. May 2009. Washington, DC. Available at:
http://www1.eere.energy.gov/buildings/appliance_standards/residential/pdfs/bceps_frameworkdocument.pdf.
\18\ See id.
---------------------------------------------------------------------------
AHAM agreed with DOE's removal of the 40 percent depth-of-discharge
measurement, saying that DOE should not require measurements at
multiple depths of discharge. (AHAM, No. 2 at p. 175; AHAM, No. 10 at
p. 7)
Alternatively, Euro-Pro noted that if batteries are only measured
at 100
[[Page 31774]]
percent depth-of-discharge, the energy use of batteries with protective
circuitry that prevents them from reaching that depth may not be able
to be accurately measured. (Euro-Pro, No. 2 at p. 177) They also
commented that products that will not permit a 100-percent depth-of-
discharge level when being used by consumers may achieve better energy
use ratings than they deserve. This is because they will never be able
to reach a 100-percent depth-of-discharge level, yet the test procedure
will test them at this level. As a result, the test will measure the
presence of more energy to be recovered from the battery than can be
used by the consumer. (Euro-Pro, Pub. Mtg. Tran., No. 2 at p. 179)
DOE acknowledges the comments from interested parties. DOE believes
that by following the outlined test procedure, including the
preparatory discharge step, products will not inadvertently achieve
better energy use ratings than what they are capable of achieving when
in actual use in the field. The UUT will be taken from a known state of
discharge, charged, and then discharged back to the known state, which
ensures that a product's energy consumption will be appropriate for its
design and capabilities. By following this procedure, it should be
physically impossible to get more energy out of the battery during the
measured discharge than what was put in during the measured charge and
maintenance mode test. Therefore, as discussed in the NOPR, DOE will
not incorporate testing at alternative levels of depths-of-discharge.
Requiring testing at only 100 percent depth-of-discharge also promotes
consistent testing across products, making it easy to compare products
and reducing the testing burden on manufacturers.
IV. Procedural Issues and Regulatory Review
A. Review Under Executive Order 12866
The Office of Management and Budget (OMB) has determined that test
procedure rulemakings do not constitute ``significant regulatory
actions'' under section 3(f) of Executive Order 12866 Regulatory
Planning and Review, 58 FR 51735 (Oct. 4, 1993). Accordingly, this
action was not subject to review under the Executive Order by the
Office of Information and Regulatory Affairs (OIRA) in OMB.
B. Review Under the Regulatory Flexibility Act
The Regulatory Flexibility Act (5 U.S.C. 601 et seq., as amended by
the Small Business Regulatory Enforcement Fairness Act of 1996)
requires preparation of an initial regulatory flexibility analysis for
any rule that, by law, must be proposed for public comment, unless the
agency certifies that the rule, if promulgated, will not have a
significant economic impact on a substantial number of small entities.
A regulatory flexibility analysis examines the impact of the rule on
small entities and considers alternative ways of reducing negative
effects. Also, as required by Executive Order 13272, ``Proper
Consideration of Small Entities in Agency Rulemaking,'' 67 FR 53461
(August 16, 2002), DOE published procedures and policies on February
19, 2003, to ensure that the potential impact of its rules on small
entities are properly considered during the DOE rulemaking process. 68
FR 7990. DOE made its procedures and policies available on the Office
of the General Counsel's Web site at http://www.gc.doe.gov.
DOE identified producers of products covered by this rulemaking
that have manufacturing facilities located within the United States and
could be considered small entities by searching the SBA Web site to
identify manufacturers within the applicable NAICS code. After
examining this information, DOE ascertained that many of the companies
that manufacture these products are large multinational corporations
with more than 500 employees. DOE also identified some small businesses
that could potentially be manufacturers of covered products. DOE notes
that with respect to battery charger and multiple-voltage external
power supply manufacturers, there are currently no standards in place
for these products for manufacturers to meet. Accordingly,
manufacturers are under no obligation to use these procedures until DOE
prescribes standards for them. As for the changes to the single-voltage
external power supply procedure, these proposed amendments will reduce
the overall burden to manufacturers and provide a means to test more
complex devices.
After reviewing its proposal, DOE had tentatively concluded that
two aspects of the proposal may result in some increased testing burden
for manufacturers generally: the revision of the battery charger test
procedure to include a test for battery chargers operating in active
mode and the addition of a test procedure for multiple-voltage external
power supplies.
DOE anticipates, however, that adding an active mode battery
charger test procedure will not be likely to cause a significant burden
to small manufacturers because the steps in the active mode test
procedure that DOE is promulgating in this rule already exist in the
current DOE test procedure. The additional step that this rule will
require will be the recording of certain values during one of those
steps. Additionally, this rule is based largely on procedures already
implemented by the State of California that are already followed by the
industry. By basing its rule on these established procedures, DOE
anticipates little, if any, incremental increase in testing cost or
burden from this rulemaking. Manufacturers are familiar with the steps
detailed in the procedure being adopted today and should already have
the necessary equipment to conduct these tests.
Similarly, the addition of a multiple-voltage external power supply
test procedure will not have a significant impact on small businesses
since these devices are manufactured almost exclusively by businesses
that exceed the small business size threshold for this category.
Further, the multiple-voltage external power supply test procedure
being adopted today is nearly identical to the single-voltage external
power supply procedure already in place that manufacturers must follow.
This procedure was not noted by interested parties as being burdensome
by small businesses.
In addition to the relatively modest changes introduced by today's
rule to the existing test procedure that manufacturers are already
using, manufacturers will only be required to test products that are
subject to energy conservation standards. Currently, there are no
standards in place for battery chargers or multiple-voltage external
power supplies. Until energy conservation standards are adopted, no
entities, small or large, would be required to comply with the proposed
battery charger and external power supply test procedures. As a result,
in light of all of the above factors, DOE believes that today's rule
would not have a ``significant economic impact on a substantial number
of small entities.''
The amendments discussed in this final rule affecting Class A
external power supplies, which are covered by statutorily-set
standards, do not significantly change the existing test procedure used
to measure the energy output of these devices. DOE does not expect
these amendments to impose a significant new testing and compliance
burden. Therefore, these amendments also would be unlikely to have
significant impact on a substantial number of small entities.
Accordingly, DOE has not prepared a regulatory flexibility analysis
for this rulemaking. DOE has provided its
[[Page 31775]]
certification and supporting statement of factual basis to the Chief
Counsel for Advocacy of the Small Business Administration for review
under 5 U.S.C. 605(b).
C. Review Under the Paperwork Reduction Act
Manufacturers of battery chargers and external power supplies must
certify to DOE that their products comply with any applicable energy
conservation standard. In certifying compliance, manufacturers must
test their equipment according to the applicable DOE test procedure,
including any amendments adopted for that test procedure. DOE has
adopted regulations for the certification and recordkeeping
requirements for all covered consumer products and commercial
equipment, including battery chargers and external power supplies. 76
FR 12442 (March 7, 2011). The collection-of-information requirement for
the certification and recordkeeping has been approved by OMB under
control number 1910-1400. The public reporting burden for the
certification is estimated to average 20 hours per response, including
the time for reviewing instructions, searching existing data sources,
gathering and maintaining the data needed, and completing and reviewing
the collection of information.
Notwithstanding any other provision of the law, no person is
required to respond to, nor shall any person be subject to a penalty
for failure to comply with, a collection of information subject to the
requirements of the PRA, unless that collection of information displays
a currently valid OMB Control Number.
D. Review Under the National Environmental Policy Act
In this final rule, DOE amends its test procedures for battery
chargers and external power supplies. These amendments will enable
manufacturers to test the energy consumption of battery chargers while
charging batteries and reduce the amount of testing time during standby
and off mode testing. The amendments also provide a method by which to
test those external power supplies that are equipped with USB outputs
as well as those power supplies that are of the multi-voltage type.
These amendments, where applicable, will also be used to develop and
implement future energy conservation standards for battery chargers and
external power supplies. After carefully considering the nature and
impacts of this rule, DOE has determined that this final rule falls
into a class of actions that are categorically excluded from review
under the National Environmental Policy Act of 1969 (42 U.S.C. 4321, et
seq.) and DOE's implementing regulations at 10 CFR part 1021.
Specifically, this rule amends an existing rule without changing its
environmental effect, and, therefore, is covered by the categorical
exclusion contained in 10 CFR part 1021, subpart D, paragraph A5. The
exclusion applies because this rule establishes revisions to existing
test procedures that will not affect the amount, quality, or
distribution of energy usage, and, therefore, will not result in any
environmental impacts. Accordingly, neither an environmental assessment
nor an environmental impact statement is required.
E. Review Under Executive Order 13132
Executive Order 13132, ``Federalism,'' 64 FR 43255 (August 4, 1999)
imposes certain requirements on agencies formulating and implementing
policies or regulations that preempt State law or that have Federalism
implications. The Executive Order requires agencies to examine the
constitutional and statutory authority supporting any action that would
limit the policymaking discretion of the States and to carefully assess
the necessity for such actions. The Executive Order also requires
agencies to have an accountable process to ensure meaningful and timely
input by State and local officials in the development of regulatory
policies that have Federalism implications. On March 14, 2000, DOE
published a statement of policy describing the intergovernmental
consultation process it will follow in the development of such
regulations. 65 FR 13735. DOE has examined this rule and has determined
that it will not have a substantial direct effect on the States, on the
relationship between the national government and the States, or on the
distribution of power and responsibilities among the various levels of
government. EPCA governs and prescribes Federal preemption of state
regulations as to energy conservation for the products that are the
subject of today's rule. States can petition DOE for exemption from
such preemption to the extent, and based on criteria, set forth in
EPCA. (42 U.S.C. 6297(d)) No further action is required by Executive
Order 13132.
F. Review Under Executive Order 12988
With respect to the review of existing regulations and the
promulgation of new regulations, section 3(a) of Executive Order 12988,
``Civil Justice Reform,'' 61 FR 4729 (Feb. 7, 1996), imposes on Federal
agencies the general duty to adhere to the following requirements: (1)
Eliminate drafting errors and ambiguity; (2) write regulations to
minimize litigation; (3) provide a clear legal standard for affected
conduct rather than a general standard; and (4) promote simplification
and burden reduction. Section 3(b) of Executive Order 12988
specifically requires that Executive agencies make every reasonable
effort to ensure that the regulation: (1) clearly specifies the
preemptive effect, if any; (2) clearly specifies any effect on existing
Federal law or regulation; (3) provides a clear legal standard for
affected conduct while promoting simplification and burden reduction;
(4) specifies the retroactive effect, if any; (5) adequately defines
key terms; and (6) addresses other important issues affecting clarity
and general draftsmanship under any guidelines issued by the Attorney
General. Section 3(c) of Executive Order 12988 requires Executive
agencies to review regulations in light of applicable standards in
sections 3(a) and 3(b) to determine whether they are met or it is
unreasonable to meet one or more of them. DOE has completed the
required review and determined that, to the extent permitted by law,
the rule meets the relevant standards of Executive Order 12988.
G. Review Under Unfunded Mandates Reform Act of 1995
Title II of the Unfunded Mandates Reform Act of 1995 (UMRA) (Pub.
L. 104-4) requires each Federal agency to assess the effects of Federal
regulatory actions on State, local, and Tribal governments and the
private sector. For proposed regulatory actions likely to result in a
rule that may cause expenditures by State, local, and Tribal
governments, in the aggregate, or by the private sector of $100 million
or more in any one year (adjusted annually for inflation), section 202
of UMRA requires a Federal agency to publish estimates of the resulting
costs, benefits, and other effects on the national economy. (2 U.S.C.
1532(a), (b)) UMRA also requires Federal agencies to develop an
effective process to permit timely input by elected officers of State,
local, and Tribal governments on a proposed ``significant
intergovernmental mandate.'' In addition, UMRA requires an agency plan
for giving notice and opportunity for timely input to small governments
that may be affected before establishing a requirement that might
significantly or uniquely affect them. On March 18, 1997, DOE published
a statement of policy on its process for intergovernmental consultation
under UMRA. 62 FR 12820. (This policy is also available at http://www.gc.doe.gov). Today's rule contains neither an intergovernmental
mandate, nor a
[[Page 31776]]
mandate that may result in the expenditure of $100 million or more in
any year, so these requirements do not apply.
H. Review Under the Treasury and General Government Appropriations Act,
1999
Section 654 of the Treasury and General Government Appropriations
Act, 1999 (Pub. L. 105-277) requires Federal agencies to issue a Family
Policymaking Assessment for any proposed rule that may affect family
well-being. Today's rule will not have any impact on the autonomy or
integrity of the family as an institution. Accordingly, DOE has
concluded that it is unnecessary to prepare a Family Policymaking
Assessment.
I. Review Under Executive Order 12630
Pursuant to Executive Order 12630, ``Governmental Actions and
Interference with Constitutionally Protected Property Rights,'' 53 FR
8859 (March 15, 1988), DOE has determined that this rule will not
result in any takings that might require compensation under the Fifth
Amendment to the United States Constitution.
J. Review Under Treasury and General Government Appropriations Act,
2001
Section 515 of the Treasury and General Government Appropriations
Act, 2001 (Pub. L. 106-554; 44 U.S.C. 3516 note) provides for agencies
to review most disseminations of information to the public under
guidelines established by each agency pursuant to general guidelines
issued by OMB. OMB's guidelines were published at 67 FR 8452 (Feb. 22,
2002), and DOE's guidelines were published at 67 FR 62446 (Oct. 7,
2002). DOE has reviewed today's rule under the OMB and DOE guidelines
and has concluded that it is consistent with applicable policies in
those guidelines.
K. Review Under Executive Order 13211
Executive Order 13211, ``Actions Concerning Regulations That
Significantly Affect Energy Supply, Distribution, or Use,'' 66 FR 28355
(May 22, 2001), requires Federal agencies to prepare and submit to OMB
a Statement of Energy Effects for any proposed significant energy
action. A ``significant energy action'' is defined as any action by an
agency that promulgates or is expected to lead to promulgation of a
final rule, and that: (1) Is a significant regulatory action under
Executive Order 12866, or any successor order; and (2) is likely to
have a significant adverse effect on the supply, distribution, or use
of energy; or (3) is designated by the Administrator of OIRA as a
significant energy action. For any proposed significant energy action,
the agency must give a detailed statement of any adverse effects on
energy supply, distribution, or use if the regulation is implemented,
and of reasonable alternatives to the action and their expected
benefits on energy supply, distribution, and use. Today's regulatory
action is not a significant regulatory action under Executive Order
12866. Moreover, it would not have a significant adverse effect on the
supply, distribution, or use of energy. Therefore, it is not a
significant energy action, and, accordingly, DOE has not prepared a
Statement of Energy Effects.
L. Review Under Section 32 of the Federal Energy Administration Act of
1974
Under section 301 of the Department of Energy Organization Act
(Pub. L. 95-91; 42 U.S.C. 7101, et seq.), DOE must comply with section
32 of the Federal Energy Administration Act of 1974 (Pub. L. 93-275),
as amended by the Federal Energy Administration Authorization Act of
1977 (Pub. L. 95-70). (15 U.S.C. 788) Section 32 provides that, where a
proposed rule authorizes or requires use of commercial standards, the
rulemaking must inform the public of the use and background of such
standards. In addition, section 32(c) requires DOE to consult with the
Attorney General and the Federal Trade Commission (FTC) about the
effect of the commercial or industry standards on competition.
DOE has evaluated these revised standards, which are based on
testing protocols developed and adopted by the State of California. The
specific sections from the CEC procedure that today's rule incorporates
into the test procedure are from Part 1 of the test procedure, with
some modifications for clarity. After examining the public record
related to the promulgation of these requirements by the CEC, DOE
believes that these procedures were developed in a manner that fully
provided for public participation, comment, and review from all
interested parties. Additionally, DOE has consulted with the Attorney
General and the Chairman of the FTC concerning the affect on
competition of requiring manufacturers to use the test methods
contained in these standards, and neither objected to the incorporation
of these standards.
M. Congressional Notification
As required by 5 U.S.C. 801, DOE will report to Congress on the
promulgation of today's rule before its effective date. The report will
state that it has been determined that the rule is not a ``major rule''
as defined by 5 U.S.C. 801(2).
V. Approval of the Office of the Secretary
The Secretary of Energy has approved publication of this final
rule.
List of Subjects in 10 CFR Part 430
Administrative practice and procedure, Confidential business
information, Energy conservation, Reporting and recordkeeping
requirements.
Issued in Washington, DC, on May 3, 2011.
Kathleen B. Hogan,
Deputy Assistant Secretary for Energy Efficiency, Office of Technology
Development, Energy Efficiency and Renewable Energy.
For the reasons stated in the preamble, DOE amends part 430 of
Chapter II of Title 10, Code of Federal Regulations as set forth below:
PART 430--ENERGY CONSERVATION PROGRAM FOR CONSUMER PRODUCTS
0
1. The authority citation for part 430 continues to read as follows:
Authority: 42 U.S.C. 6291-6309; 28 U.S.C. 2461 note.
0
2. In Sec. 430.23 revise paragraph (aa) to read as follows:
Sec. 430.23 Test procedures for the measurement of energy and water
consumption.
* * * * *
(aa) Battery Chargers. Upon the effective date of any energy
conservation standard for battery chargers governing active and
maintenance mode energy consumption, the 24-hour energy consumption of
a battery charger in active and maintenance modes, expressed in watt-
hours, and the power consumption of a battery charger in maintenance
mode, expressed in watts, shall be measured in accordance with section
5.10 of appendix Y of this subpart. The power consumption of a battery
charger in standby mode and off mode, expressed in watts, shall be
measured in accordance with sections 5.11 and 5.12, respectively, of
appendix Y of this subpart.
* * * * *
0
3. Appendix Y to Subpart B of Part 430 is revised to read as follows:
[[Page 31777]]
Appendix Y to Subpart B of Part 430--Uniform Test Method for Measuring
the Energy Consumption of Battery Chargers
The provisions of this appendix are effective on the compliance
date of any energy conservation standard for battery chargers.
1. Scope
This appendix covers the test requirements used to measure
battery charger energy consumption for battery chargers operating at
either DC or United States AC line voltage (115V at 60Hz).
2. Definitions
The following definitions are for the purposes of explaining the
terminology associated with the test method for measuring battery
charger energy consumption.\1\
---------------------------------------------------------------------------
\1\ For clarity on any other terminology used in the test
method, please refer to IEEE Standard 1515-2000.
---------------------------------------------------------------------------
2.1. Active mode or charge mode is the state in which the
battery charger system is connected to the main electricity supply,
and the battery charger is delivering current, equalizing the cells,
and performing other one-time or limited-time functions in order to
bring the battery to a fully charged state.
2.2. Active power or real power (P) means the average power
consumed by a unit. For a two terminal device with current and
voltage waveforms i(t) and v(t), which are periodic with period T,
the real or active power P is:
[GRAPHIC] [TIFF OMITTED] TR01JN11.020
2.3. Ambient temperature is the temperature of the ambient air
immediately surrounding the unit under test.
2.4. Apparent power (S) is the product of root-mean-square (RMS)
voltage and RMS current in volt-amperes (VA).
2.5. Batch charger is a battery charger that charges two or more
identical batteries simultaneously in a series, parallel, series-
parallel, or parallel-series configuration. A batch charger does not
have separate voltage or current regulation, nor does it have any
separate indicators for each battery in the batch. When testing a
batch charger, the term ``battery'' is understood to mean,
collectively, all the batteries in the batch that are charged
together. A charger can be both a batch charger and a multi-port
charger or multi-voltage charger.
2.6. Battery or battery pack is an assembly of one or more
rechargeable cells and any integral protective circuitry intended to
provide electrical energy to a consumer product, and may be in one
of the following forms: (a) Detachable battery (a battery that is
contained in a separate enclosure from the consumer product and is
intended to be removed or disconnected from the consumer product for
recharging); or (b) integral battery (a battery that is contained
within the consumer product and is not removed from the consumer
product for charging purposes). The word ``intended'' in this
context refers to the whether a battery has been designed in such a
way as to permit its removal or disconnection from its associated
consumer product.
2.7. Battery energy is the energy, in watt-hours, delivered by
the battery under the specified discharge conditions in the test
procedure.
2.8. Battery maintenance mode or maintenance mode is the mode of
operation when the battery charger is connected to the main
electricity supply and the battery is fully charged, but is still
connected to the charger.
2.9. Battery rest period is a period of time between discharge
and charge or between charge and discharge, during which the battery
is resting in an open-circuit state in ambient air.
2.10. C-rate is the rate of charge or discharge, calculated by
dividing the charge or discharge current by the rated charge
capacity of the battery.
2.11. Cradle is an electrical interface between an integral
battery product and the rest of the battery charger designed to hold
the product between uses.
2.12. Equalization is a process whereby a battery is
overcharged, beyond what would be considered ``normal'' charge
return, so that cells can be balanced, electrolyte mixed, and plate
sulfation removed.
2.13. Instructions or manufacturer's instructions means the
documentation packaged with a product in printed or electronic form
and any information about the product listed on a Web site
maintained by the manufacturer and accessible by the general public
at the time of the test. It also includes any information on the
packaging or on the product itself. ``Instructions'' also includes
any service manuals or data sheets that the manufacturer offers to
independent service technicians, whether printed or in electronic
form.
2.14. Measured charge capacity of a battery is the product of
the discharge current in amperes and the time in decimal hours
required to reach the specified end-of-discharge voltage.
2.15. Manual on-off switch is a switch activated by the user to
control power reaching the battery charger. This term does not apply
to any mechanical, optical, or electronic switches that
automatically disconnect mains power from the battery charger when a
battery is removed from a cradle or charging base, or for products
with non-detachable batteries that control power to the product
itself.
2.16. Multi-port charger means a battery charger that charges
two or more batteries (which may be identical or different)
simultaneously. The batteries are not connected in series or in
parallel but with each port having separate voltage and/or current
regulation. If the charger has status indicators, each port has its
own indicator(s). A charger can be both a batch charger and a multi-
port charger if it is capable of charging two or more batches of
batteries simultaneously and each batch has separate regulation and/
or indicator(s).
2.17. Multi-voltage charger is a battery charger that, by
design, can charge a variety of batteries (or batches of batteries,
if also a batch charger) that are of different rated battery
voltages. A multi-voltage charger can also be a multi-port charger
if it can charge two or more batteries simultaneously with
independent voltage and/or current regulation.
2.18. Off mode is the condition, applicable only to units with
manual on-off switches, in which the battery charger:
(1) Is connected to the main electricity supply;
(2) Is not connected to the battery; and
(3) All manual on-off switches are turned off.
2.19. Rated battery voltage is specified by the manufacturer and
typically printed on the label of the battery itself. If there are
multiple batteries that are connected in series, the rated battery
voltage of the batteries is the total voltage of the series
configuration--that is, the rated voltage of each battery multiplied
by the number of batteries connected in series. Connecting multiple
batteries in parallel does not affect the rated battery voltage.
2.20. Rated charge capacity is the capacity claimed by a
manufacturer, on a label or in instructions, the battery can store
under specified test conditions, usually given in ampere-hours (Ah)
or milliampere-hours (mAh) and typically printed on the label of the
battery itself. If there are multiple batteries that are connected
in parallel, the rated charge capacity of the batteries is the total
charge capacity of the parallel configuration, that is, the rated
charge capacity of each battery multiplied by the number of
batteries connected in parallel. Connecting multiple batteries in
series does not affect the rated charge capacity.
2.21. Rated energy capacity means the product (in watt-hours) of
the rated battery voltage and the rated charge capacity.
2.22. Standby mode or no-battery mode means the condition in
which:
(1) The battery charger is connected to the main electricity
supply;
(2) The battery is not connected to the charger; and
(3) For battery chargers with manual on-off switches, all such
switches are turned on.
2.23. Total harmonic distortion (THD), expressed as a percent,
is the root mean square (RMS) value of an AC signal after the
fundamental component is removed and interharmonic components are
ignored, divided by the RMS value of the fundamental component.
2.24. Unit under test (UUT) in this appendix refers to the
combination of the battery charger and battery being tested.
3. Standard Test Conditions
3.1. General
The values that may be measured or calculated during the conduct
of this test procedure have been summarized for easy reference in
Table 3.1.
[[Page 31778]]
Table 3.1-- List of Measured or Calculated Values
------------------------------------------------------------------------
Name of measured or calculated
value Reference Value
------------------------------------------------------------------------
1. Duration of the charge and Section 5.2 ................
maintenance mode test.............
2. Battery Discharge Energy........ Section 4.6 ................
3. Initial time and power (W) of Section 5.8 ................
the input current of connected
battery...........................
4. Active and Maintenance Mode Section 5.8 ................
Energy Consumption................
5. Maintenance Mode Power.......... Section 5.9 ................
6. 24 Hour Energy Consumption...... Section 5.10 ................
7. Standby Mode Power.............. Section 5.11 ................
8. Off Mode Power.................. Section 5.12 ................
------------------------------------------------------------------------
3.2. Verifying Accuracy and Precision of Measuring Equipment
a. Measurements of active power of 0.5 W or greater shall be
made with an uncertainty of <= 2 percent at the 95 percent
confidence level. Measurements of active power of less than 0.5 W
shall be made with an uncertainty of <= 0.01 W at the 95 percent
confidence level. The power measurement instrument shall, as
applicable, have a resolution of:
(1) 0.01 W or better for measurements up to 10 W;
(2) 0.1 W or better for measurements of 10 to 100 W; or
(3) 1 W or better for measurements over 100 W.
b. Measurements of energy (Wh) shall be made with an uncertainty
of <= 2 percent at the 95 percent confidence level. Measurements of
voltage and current shall be made with an uncertainty of <= 1
percent at the 95 percent confidence level. Measurements of
temperature shall be made with an uncertainty of <= 2 [deg]C at the
95 percent confidence level.
c. All equipment used to conduct the tests must be selected and
calibrated to ensure that measurements will meet the above
uncertainty requirements. For suggestions on measuring low power
levels, see IEC 62301, (Reference for guidance only, see Sec.
430.4) especially Section 5.3.2 and Annexes B and D.
3.3. Setting Up the Test Room
All tests, battery conditioning, and battery rest periods shall
be carried out in a room with an air speed immediately surrounding
the UUT of <= 0.5 m/s. The ambient temperature shall be maintained
at 20 [deg]C 5 [deg]C throughout the test. There shall
be no intentional cooling of the UUT such as by use of separately
powered fans, air conditioners, or heat sinks. The UUT shall be
conditioned, rested, and tested on a thermally non-conductive
surface. When not undergoing active testing, batteries shall be
stored at 20 [deg]C 5 [deg]C.
3.4. Verifying the UUT's Input Voltage and Input Frequency
a. If the UUT is intended for operation on AC line-voltage input
in the United States, it shall be tested at 115 V at 60 Hz. If the
UUT is intended for operation on AC line-voltage input but cannot be
operated at 115 V at 60 Hz, it shall not be tested.
b. If a charger is powered by a low-voltage DC or AC input, and
the manufacturer packages the charger with a wall adapter, sells, or
recommends an optional wall adapter capable of providing that low
voltage input, then the charger shall be tested using that wall
adapter and the input reference source shall be 115 V at 60 Hz. If
the wall adapter cannot be operated with AC input voltage at 115 V
at 60 Hz, the charger shall not be tested.
c. If the UUT is designed for operation only on DC input voltage
and the provisions of paragraph 3.4 (b) above do not apply, it shall
be tested with one of the following input voltages: 5.0 V DC for
products drawing power from a computer USB port or the midpoint of
the rated input voltage range for all other products. The input
voltage shall be within 1 percent of the above
specified voltage.
d. If the input voltage is AC, the input frequency shall be
within 1 percent of the specified frequency. The THD of
the input voltage shall be <= 2 percent, up to and including the
13th harmonic. The crest factor of the input voltage shall be
between 1.34 and 1.49.
e. If the input voltage is DC, the AC ripple voltage (RMS) shall
be:
(1) <= 0.2 V for DC voltages up to 10 V; or
(2) <= 2 percent of the DC voltage for DC voltages over 10 V.
Unit Under Test Setup Requirements
4.1. General Setup
a. The battery charger system shall be prepared and set up in
accordance with the manufacturer's instructions, except where those
instructions conflict with the requirements of this test procedure.
If no instructions are given, then factory or ``default'' settings
shall be used, or where there are no indications of such settings,
the UUT shall be tested in the condition as it would be supplied to
an end user.
b. If the battery charger has user controls to select from two
or more charge rates (such as regular or fast charge) or different
charge currents, the test shall be conducted at the fastest charge
rate that is recommended by the manufacturer for everyday use, or,
failing any explicit recommendation, the factory-default charge
rate. If the charger has user controls for selecting special charge
cycles that are recommended only for occasional use to preserve
battery health, such as equalization charge, removing memory, or
battery conditioning, these modes are not required to be tested. The
settings of the controls shall be listed in the report for each
test.
4.2. Selection and Treatment of the Battery Charger
The UUT, including the battery charger and its associated
battery, shall be new products of the type and condition that would
be sold to a customer. If the battery is lead-acid chemistry and the
battery is to be stored for more than 24 hours between its initial
acquisition and testing, the battery shall be charged before such
storage.
4.3. Selection of Batteries To Use for Testing
a. For chargers with integral batteries, the battery packaged
with the charger shall be used for testing. For chargers with
detachable batteries, the battery or batteries to be used for
testing will vary depending on whether there are any batteries
packaged with the battery charger.
(1) If batteries are packaged with the charger, batteries for
testing shall be selected from the batteries packaged with the
battery charger, according to the procedure in section 4.3.b.
(2) If no batteries are packaged with the charger, but the
instructions specify or recommend batteries for use with the
charger, batteries for testing shall be selected from those
recommended or specified in the instructions, according to the
procedure in section 4.3.b.
(3) If no batteries are packaged with the charger and the
instructions do not specify or recommend batteries for use with the
charger, batteries for testing shall be selected from any that are
suitable for use with the charger, according to the procedure in
section 4.3.b.
b. From the detachable batteries specified above, the technician
shall use Table 4.1 to select the batteries to be used for testing
depending on the type of charger being tested. Each row in the table
represents a mutually exclusive charger type. The technician shall
find the single applicable row for the UUT, and test according to
those requirements.
c. A charger is considered as:
(1) Single-capacity if all associated batteries have the same
rated charge capacity (see definition) and, if it is a batch
charger, all configurations of the batteries have the same rated
charge capacity.
(2) Multi-capacity if there are associated batteries or
configurations of batteries that have different rated charge
capacities.
d. The selected battery or batteries will be referred to as the
``test battery'' and will be used through the remainder of this test
procedure.
[[Page 31779]]
Table 4.1--Battery Selection for Testing
----------------------------------------------------------------------------------------------------------------
Type of charger Tests to perform
----------------------------------------------------------------------------------------------------------------
Battery
selection (from
all
Multi-voltage Multi-port Multi- capacity Number of tests configurations
of all
associated
batteries)
----------------------------------------------------------------------------------------------------------------
No.................... No.................... No.................... 1..................... Any associated
battery.
No.................... No.................... Yes................... 2..................... Lowest charge
capacity
battery.
Highest charge
capacity
battery.
No.................... Yes................... Yes or No............. 2..................... Use only one
port and use
the minimum
number of
batteries with
the lowest
rated charge
capacity that
the charger can
charge.
Use all ports
and use the
maximum number
of identical
batteries of
the highest
rated charge
capacity the
charger can
accommodate.
Yes................... No.................... No.................... 2..................... Lowest voltage
battery.
Highest voltage
battery.
Yes................... Yes to either or both. ...................... 3..................... Of the batteries
with the lowest
voltage, use
the one with
the lowest
charge
capacity. Use
only one port.
Of the batteries
with the
highest
voltage, use
the one with
the lowest
charge
capacity. Use
only one port.
Use all ports
and use the
battery or the
configuration
of batteries
with the
highest total
rated energy
capacity.
----------------------------------------------------------------------------------------------------------------
4.4. Limiting Other Non-Battery-Charger Functions
a. If the battery charger or product containing the battery
charger does not have any additional functions unrelated to battery
charging, this subsection may be skipped.
b. Any optional functions controlled by the user and not
associated with the battery charging process (e.g., the answering
machine in a cordless telephone charging base) shall be switched
off. If it is not possible to switch such functions off, they shall
be set to their lowest power-consuming mode during the test.
c. If the battery charger takes any physically separate
connectors or cables not required for battery charging but
associated with its other functionality (such as phone lines, serial
or USB connections, Ethernet, cable TV lines, etc.), these
connectors or cables shall be left disconnected during the testing.
d. Any manual on-off switches specifically associated with the
battery charging process shall be switched on for the duration of
the charge, maintenance, and no-battery mode tests, and switched off
for the off mode test.
4.5. Accessing the Battery for the Test
a. The technician may need to disassemble the end-use product or
battery charger to gain access to the battery terminals for the
Battery Discharge Energy Test in section 5.6. If the battery
terminals are not clearly labeled, the technician shall use a
voltmeter to identify the positive and negative terminals. These
terminals will be the ones that give the largest voltage difference
and are able to deliver significant current (0.2 C or 1/hr) into a
load.
b. All conductors used for contacting the battery must be
cleaned and burnished prior to connecting in order to decrease
voltage drops and achieve consistent results.
c. Manufacturer's instructions for disassembly shall be
followed, except those instructions that:
(1) Lead to any permanent alteration of the battery charger
circuitry or function;
(2) Could alter the energy consumption of the battery charger
compared to that experienced by a user during typical use, e.g., due
to changes in the airflow through the enclosure of the UUT; or
(3) Conflict requirements of this test procedure.
d. Care shall be taken by the technician during disassembly to
follow appropriate safety precautions. If the functionality of the
device or its safety features is compromised, the product shall be
discarded after testing.
e. Some products may include protective circuitry between the
battery cells and the remainder of the device. If the manufacturer
provides a description for accessing the connections at the output
of the protective circuitry, these connections shall be used to
discharge the battery and measure the discharge energy. The energy
consumed by the protective circuitry during discharge shall not be
measured or credited as battery energy.
f. If the technician, despite diligent effort and use of the
manufacturer's instructions, encounters any of the following
conditions noted immediately below, the Battery Discharge Energy and
the Charging and Maintenance Mode Energy shall be reported as ``Not
Applicable'':
(1) Inability to access the battery terminals;
(2) Access to the battery terminals destroys charger
functionality; or
(3) Inability to draw current from the test battery.
4.6. Determining Charge Capacity for Batteries With No Rating
If there is no rating for the battery charge capacity on the
battery or in the instructions, then the technician shall determine
a discharge current that meets the following requirements. The
battery shall be fully charged and then discharged at this constant-
current rate until it reaches the end-of-discharge voltage specified
in Table 5.2. The discharge time must be not less than 4.5 hours nor
more than 5 hours. In addition, the discharge test (Section 5.6)
(which may not be starting with a fully-charged battery) shall reach
the end-of-discharge voltage within 5 hours. The same discharge
current shall be used for both the preparations step (Section 5.4)
and the discharge test (Section 5.6). The test report shall include
the discharge current used and the resulting discharge times for
both a fully-charged battery and for the discharge test.
For this section, the battery is considered as ``fully charged''
when either (a) it has been charged by the UUT until an indicator on
the UUT shows that the charge is complete, or (b) it has been
charged by a battery analyzer at a current not greater than the
discharge current until the battery analyzer indicates that the
battery is fully charged.
When there is no capacity rating, a suitable discharge current
must generally be determined by trial and error. Since the
conditioning step does not require constant-current discharges, the
trials themselves may also be counted as part of battery
conditioning.
5. Test Measurement
The test sequence to measure the battery charger energy
consumption is summarized in Table 5.1, and explained in detail
below. Measurements shall be made under test conditions and with the
equipment specified in Sections 3 and 4.
[[Page 31780]]
Table 5.1--Test Sequence
--------------------------------------------------------------------------------------------------------------------------------------------------------
Equipment needed
--------------------------------------------------------------------------
Thermometer
Step Description Data taken? Battery (for flooded
Test Charger analyzer or AC power meter lead-acid
battery constant- battery
current load chargers only)
--------------------------------------------------------------------------------------------------------------------------------------------------------
1............. Record general data on UUT; Section Yes................... X X ............... ............... ...............
5.1.
2............. Determine test duration; Section 5.2. No.................... .......... .......... ............... ............... ...............
3............. Battery conditioning; Section 5.3.... No.................... X X X ............... ...............
4............. Prepare battery for charge test; No.................... X X ............... ............... ...............
Section 5.4.
5............. Battery rest period; Section 5.5..... No.................... X .......... ............... ............... X
6............. Conduct Charge Mode and Battery Yes................... X X ............... X ...............
Maintenance Mode Test; Section 5.6.
7............. Battery Rest Period; Section 5.7..... No.................... X .......... ............... ............... X
8............. Battery Discharge Energy Test; Yes................... X .......... X ............... ...............
Section 5.8.
9............. Determining the Maintenance Mode Yes................... X X ............... X ...............
Power; Section 5.9.
10............ Calculating the 24-Hour Energy No.................... .......... .......... ............... ............... ...............
Consumption; Section 5.10.
11............ Standby Mode Test; Section 5.11...... Yes................... .......... X ............... X ...............
12............ Off Mode Test; Section 5.12.......... Yes................... .......... X ............... X ...............
--------------------------------------------------------------------------------------------------------------------------------------------------------
5.1. Recording General Data on the UUT
The technician shall record:
(1) The manufacturer and model of the battery charger;
(2) The presence and status of any additional functions
unrelated to battery charging;
(3) The manufacturer, model, and number of batteries in the test
battery;
(4) The rated battery voltage of the test battery;
(5) The rated charge capacity of the test battery; and
(6) The rated charge energy of the test battery.
(7) The settings of the controls, if battery charger has user
controls to select from two or more charge rates
5.2. Determining the Duration of the Charge and Maintenance Mode
Test
a. The charging and maintenance mode test, described in detail
in section 5.8, shall be 24 hours in length or longer, as determined
by the items below. Proceed in order until a test duration is
determined.
(1) If the battery charger has an indicator to show that the
battery is fully charged, that indicator shall be used as follows:
If the indicator shows that the battery is charged after 19 hours of
charging, the test shall be terminated at 24 hours. Conversely, if
the full-charge indication is not yet present after 19 hours of
charging, the test shall continue until 5 hours after the indication
is present.
(2) If there is no indicator, but the manufacturer's
instructions indicate that charging this battery or this capacity of
battery should be complete within 19 hours, the test shall be for 24
hours. If the instructions indicate that charging may take longer
than 19 hours, the test shall be run for the longest estimated
charge time plus 5 hours.
(3) If there is no indicator and no time estimate in the
instructions, but the charging current is stated on the charger or
in the instructions, calculate the test duration as the longer of 24
hours or:
[GRAPHIC] [TIFF OMITTED] TR01JN11.021
b. If none of the above applies, the duration of the test shall
be 24 hours.
5.3. Battery Conditioning
a. No conditioning is to be done on lead-acid or lithium-ion
batteries. The test technician shall proceed directly to battery
preparation, section 5.4, when testing chargers for these batteries.
b. Products with integral batteries will have to be disassembled
per the instructions in section 4.5, and the battery disconnected
from the charger for discharging.
c. Batteries of other chemistries that have not been previously
cycled are to be conditioned by performing two charges and two
discharges, followed by a charge, as below. No data need be recorded
during battery conditioning.
(1) The test battery shall be fully charged for the duration
specified in section 5.2 or longer using the UUT.
(2) The test battery shall then be fully discharged using
either:
(i) A battery analyzer at a rate not to exceed 1 C, until its
average cell voltage under load reaches the end-of-discharge voltage
specified in Table 5.2 for the relevant battery chemistry; or
(ii) The UUT, until the UUT ceases operation due to low battery
voltage.
(3) The test battery shall again be fully charged as in step
c.(1) of this section.
(4) The test battery shall again be fully discharged as per step
c.(2) of this section.
(5) The test battery shall be again fully charged as in step
c.(1) of this section.
d. Batteries of chemistries other than lead-acid or lithium-ion
that are known to have been through at least two previous full
charge/discharge cycles shall only be charged once per step c.(5),
of this section.
5.4. Preparing the Battery for Charge Testing
Following any conditioning prior to beginning the battery charge
test (section 5.6), the test battery shall be fully discharged for
the duration specified in section 5.2 or longer using a battery
analyzer.
5.5. Resting the Battery
The test battery shall be rested between preparation and the
battery charge test. The rest period shall be at least one hour and
not exceed 24 hours. For batteries with flooded cells, the
electrolyte temperature shall be less than 30 [deg]C before
charging, even if the rest period must be extended longer than 24
hours.
5.6. Testing Charge Mode and Battery Maintenance Mode
a. The Charge and Battery Maintenance Mode test measures the
energy consumed during charge mode and some time spent in the
maintenance mode of the UUT. Functions required for battery
conditioning that happen only with some user-selected switch or
other control shall not be included in this measurement. (The
technician shall manually turn off any battery conditioning cycle or
setting.) Regularly occurring battery conditioning or maintenance
functions that are not controlled by the user will, by
[[Page 31781]]
default, be incorporated into this measurement.
b. During the measurement period, input power values to the UUT
shall be recorded at least once every minute.
(1) If possible, the technician shall set the data logging
system to record the average power during the sample interval. The
total energy is computed as the sum of power samples (in watts)
multiplied by the sample interval (in hours).
(2) If this setting is not possible, then the power analyzer
shall be set to integrate or accumulate the input power over the
measurement period and this result shall be used as the total
energy.
c. The technician shall follow these steps:
(1) Ensure that the user-controllable device functionality not
associated with battery charging and any battery conditioning cycle
or setting are turned off, as instructed in section 4.4;
(2) Ensure that the test battery used in this test has been
conditioned, prepared, discharged, and rested as described in
sections 5.3 through 5.7;
(3) Connect the data logging equipment to the battery charger;
(4) Record the start time of the measurement period, and begin
logging the input power;
(5) Connect the test battery to the battery charger within 3
minutes of beginning logging. For integral battery products, connect
the product to a cradle or wall adapter within 3 minutes of
beginning logging;
(6) After the test battery is connected, record the initial time
and power (W) of the input current to the UUT. These measurements
shall be taken within the first 10 minutes of active charging;
(7) Record the input power for the duration of the ``Charging
and Maintenance Mode Test'' period, as determined by section 5.2.
The actual time that power is connected to the UUT shall be within
5 minutes of the specified period; and
(8) Disconnect power to the UUT, terminate data logging, and
record the final time.
5.7. Resting the Battery
The test battery shall be rested between charging and
discharging. The rest period shall be at least 1 hour and not more
than 4 hours, with an exception for flooded cells. For batteries
with flooded cells, the electrolyte temperature shall be less than
30 [deg]C before charging, even if the rest period must be extended
beyond 4 hours.
5.8. Battery Discharge Energy Test
a. If multiple batteries were charged simultaneously, the
discharge energy is the sum of the discharge energies of all the
batteries.
(1) For a multi-port charger, batteries that were charged in
separate ports shall be discharged independently.
(2) For a batch charger, batteries that were charged as a group
may be discharged individually, as a group, or in sub-groups
connected in series and/or parallel. The position of each battery
with respect to the other batteries need not be maintained.
b. During discharge, the battery voltage and discharge current
shall be sampled and recorded at least once per minute. The values
recorded may be average or instantaneous values.
c. For this test, the technician shall follow these steps:
(1) Ensure that the test battery has been charged by the UUT and
rested according to the procedures above.
(2) Set the battery analyzer for a constant discharge current of
0.2 [deg]C and the end-of-discharge voltage in Table 5.2 for the
relevant battery chemistry.
(3) Connect the test battery to the analyzer and begin recording
the voltage, current, and wattage, if available from the battery
analyzer. When the end-of-discharge voltage is reached or the UUT
circuitry terminates the discharge, the test battery shall be
returned to an open-circuit condition. If current continues to be
drawn from the test battery after the end-of-discharge condition is
first reached, this additional energy is not to be counted in the
battery discharge energy.
d. If not available from the battery analyzer, the battery
discharge energy (in watt-hours) is calculated by multiplying the
voltage (in volts), current (in amperes), and sample period (in
hours) for each sample, and then summing over all sample periods
until the end-of-discharge voltage is reached.
5.9. Determining the Maintenance Mode Power
After the measurement period is complete, the technician shall
determine the average maintenance mode power consumption by
examining the power-versus-time data from the charge and maintenance
test and:
(1) If the maintenance mode power is cyclic or shows periodic
pulses, compute the average power over a time period that spans a
whole number of cycles and includes at least the last 4 hours.
(2) Otherwise, calculate the average power value over the last 4
hours.
5.10. Determining the 24-Hour Energy Consumption
The accumulated energy or the average input power, integrated
over the test period from the charge and maintenance mode test,
shall be used to calculate 24-hour energy consumption.
Table 5.2--Required Battery Discharge Rates and End-of-Discharge Battery
Voltages
------------------------------------------------------------------------
End-of- discharge
Battery chemistry Discharge rate C voltage volts
per cell
------------------------------------------------------------------------
Valve-Regulated Lead Acid (VRLA)... 0.2 1.75
Flooded Lead Acid.................. 0.2 1.70
Nickel Cadmium (NiCd).............. 0.2 1.0
Nickel Metal Hydride (NiMH)........ 0.2 1.0
Lithium Ion (Li-Ion)............... 0.2 2.5
Lithium Polymer.................... 0.2 2.5
Rechargeable Alkaline.............. 0.2 0.9
Nanophosphate Lithium Ion.......... 0.2 2.0
Silver Zinc........................ 0.2 1.2
------------------------------------------------------------------------
5.11. Standby Mode Energy Consumption Measurement
The standby mode measurement depends on the configuration of the
battery charger, as follows.
a. Conduct a measurement of standby power consumption while the
battery charger is connected to the power source. Disconnect the
battery from the charger, allow the charger to operate for at least
30 minutes, and record the power (i.e., watts) consumed as the time
series integral of the power consumed over a 10-minute test period,
divided by the period of measurement. If the battery charger has
manual on-off switches, all must be turned on for the duration of
the standby mode test.
b. Standby mode may also apply to products with integral
batteries. If the product uses a cradle and/or adapter for power
conversion and charging, then ``disconnecting the battery from the
charger'' will require disconnection of the end-use product, which
contains the batteries. The other enclosures of the battery charging
system will remain connected to the main electricity supply, and
standby mode power consumption will equal that of the cradle and/or
adapter alone.
c. If the product is powered through a detachable AC power cord
and contains integrated power conversion and charging circuitry,
then only the cord will remain connected to mains, and standby mode
power consumption will equal that of the AC power cord (i.e., zero
watts).
[[Page 31782]]
d. Finally, if the product contains integrated power conversion
and charging circuitry but is powered through a non-detachable AC
power cord or plug blades, then no part of the system will remain
connected to mains, and standby mode measurement is not applicable.
5.12. Off Mode Energy Consumption Measurement
The off mode measurement depends on the configuration of the
battery charger, as follows.
a. If the battery charger has manual on-off switches, record a
measurement of off mode energy consumption while the battery charger
is connected to the power source. Remove the battery from the
charger, allow the charger to operate for at least 30 minutes, and
record the power (i.e., watts) consumed as the time series integral
of the power consumed over a 10-minute test period, divided by the
period of measurement, with all manual on-off switches turned off.
If the battery charger does not have manual on-off switches, record
that the off mode measurement is not applicable to this product.
b. Off mode may also apply to products with integral batteries.
If the product uses a cradle and/or adapter for power conversion and
charging, then ``disconnecting the battery from the charger'' will
require disconnection of the end-use product, which contains the
batteries. The other enclosures of the battery charging system will
remain connected to the main electricity supply, and off mode power
consumption will equal that of the cradle and/or adapter alone.
c. If the product is powered through a detachable AC power cord
and contains integrated power conversion and charging circuitry,
then only the cord will remain connected to mains, and off mode
power consumption will equal that of the AC power cord (i.e., zero
watts).
d. Finally, if the product contains integrated power conversion
and charging circuitry but is powered through a non-detachable AC
power cord or plug blades, then no part of the system will remain
connected to mains, and off mode measurement is not applicable.
4. Amend Appendix Z to Subpart B of Part 430 by revising paragraphs
2(c), 3(b), 4(a)(i) and 4(b) to read as follows:
Appendix Z to Subpart B of Part 430--Uniform Test Method for Measuring
the Energy Consumption of External Power Supplies
* * * * *
2. * * *
c. Active power (P) (also real power) means the average power
consumed by a unit. For a two terminal device with current and
voltage waveforms i(t) and v(t) which are periodic with period T,
the real or active power P is:
[GRAPHIC] [TIFF OMITTED] TR01JN11.022
* * * * *
3. * * *
(b) Multiple-Voltage External Power Supply. Unless otherwise
specified, measurements shall be made under test conditions and with
equipment specified below.
(i) Verifying Accuracy and Precision of Measuring Equipment
(A) Measurements of power 0.5 W or greater shall be made with an
uncertainty of <= 2 percent at the 95 percent confidence level.
Measurements of power less than 0.5 W shall be made with an
uncertainty of <= 0.01 W at the 95 percent confidence level. The
power measurement instrument shall have a resolution of:
(1) 0.01 W or better for measurements up to 10 W;
(2) 0.1 W or better for measurements of 10 to 100 W; or
(3) 1 W or better for measurements over 100 W.
(B) Measurements of energy (Wh) shall be made with an
uncertainty of <= 2 percent at the 95 percent confidence level.
Measurements of voltage and current shall be made with an
uncertainty of <= 1 percent at the 95 percent confidence level.
Measurements of temperature shall be made with an uncertainty of <=
2 [deg]C at the 95 percent confidence level.
(C) All equipment used to conduct the tests must be selected and
calibrated to ensure that measurements will meet the above
uncertainty requirements. For guidance on measuring low power
levels, see IEC 62301, Section 5.3.2 and Annexes B and D (Reference
for guidance only, see Sec. 430.4).
(ii) Setting Up the Test Room
All tests shall be carried out in a room with an air speed
immediately surrounding the UUT of <= 0.5 m/s. The ambient
temperature shall be maintained at 20 [deg]C 5 [deg]C
throughout the test. There shall be no intentional cooling of the
UUT such as by use of separately powered fans, air conditioners, or
heat sinks. The UUT shall be conditioned, rested, and tested on a
thermally non-conductive surface. A readily available material such
as Styrofoam will be sufficient.
(iii) Verifying the UUT's Input Voltage and Input Frequency
(A) If the UUT is intended for operation on AC line-voltage
input in the United States, it shall be tested at 115 V at 60 Hz. If
the UUT is intended for operation on AC line-voltage input but
cannot be operated at 115 V at 60 Hz, it shall not be tested. The
input voltage shall be within 1 percent of the above
specified voltage.
(B) If the input voltage is AC, the input frequency shall be
within 1 percent of the specified frequency. The THD of
the input voltage shall be <= 2 percent, up to and including the
13th harmonic. The crest factor of the input voltage shall be
between 1.34 and 1.49.
4. * * *
(a) * * *
(i) Standby Mode and Active Mode Measurement--The measurement of
standby mode (also no-load mode) energy consumption and active mode
efficiency shall conform to the requirements specified in section 5,
``Measurement Approach'' of the CEC's ``Test Method for Calculating
the Energy Efficiency of Single-Voltage External Ac-Dc and Ac-Ac
Power Supplies,'' August 11, 2004, (incorporated by reference, see
Sec. 430.3). Switch-selectable single-voltage external power
supplies shall be tested twice--once at the highest nameplate output
voltage and once at the lowest.
(A) If the product has more than two output wires, including
those that are necessary for controlling the product, the
manufacturer shall supply a connection diagram or test fixture that
will allow the testing laboratory to put the unit under test into
active mode.
(B) For those external power supplies that cannot sustain output
at 100 percent loading condition, this efficiency metric shall not
be included. For these external power supplies, the average
efficiency is the average of the efficiencies measured at 25
percent, 50 percent, and 75 percent of maximum load.
(C) In the case where the external power supply lists both an
instantaneous and continuous output current, it shall be tested at
the continuous condition only.
* * * * *
(b) Multiple-Voltage External Power Supply--Power supplies must
be tested with the output cord packaged with the unit for sale to
the consumer, as it is considered part of the unit under test. There
are two options for connecting metering equipment to the output of
this type of power supply: cut the cord immediately adjacent to the
output connector or attach leads and measure the efficiency from the
output connector itself. If the power supply is attached directly to
the product that it is powering, cut the cord immediately adjacent
to the powered product and connect output measurement probes at that
point. The tests should be conducted on the sets of output wires
that constitute the output busses. If the product has additional
wires, these should be left electrically disconnected unless they
are necessary for controlling the product. In this case, the
manufacturer shall supply a connection diagram or test fixture that
will allow the testing laboratory to put the unit under test into
active mode.
(i) Standby-Mode and Active-Mode Measurement--The measurement of
the multiple-voltage external power supply standby mode (also no-
load-mode) energy consumption and active-mode efficiency shall be as
follows:
(A) Loading conditions and testing sequence. (1) If the unit
under test has on-off switches, all switches shall be placed in the
``on'' position. Loading criteria for multiple-voltage external
power supplies shall be based on nameplate output current and not on
nameplate output power because output voltage might not remain
constant.
(2) The unit under test shall operate at 100 percent of
nameplate current output for at least 30 minutes immediately before
conducting efficiency measurements.
(3) After this warm-up period, the technician shall monitor AC
input power for a period of 5 minutes to assess the stability of the
unit under test. If the power level does not drift by more than 1
percent from the maximum value observed, the unit under test can be
considered stable and measurements can be recorded at the end of the
5-minute
[[Page 31783]]
period. Measurements at subsequent loading conditions, listed in
Table 1, can then be conducted under the same 5-minute stability
guidelines. Only one warm-up period of 30 minutes is required for
each unit under test at the beginning of the test procedure.
(4) If AC input power is not stable over a 5-minute period, the
technician shall follow the guidelines established by IEC Standard
62301 for measuring average power or accumulated energy over time
for both input and output. (Reference for guidance only, see Sec.
430.4).
(5) The unit under test shall be tested at the loading
conditions listed in Table 1, derated per the proportional
allocation method presented in the following section.
Table 1--Loading Conditions for Unit Under Test
------------------------------------------------------------------------
------------------------------------------------------------------------
Loading Condition 1.................... 100% of Derated Nameplate
Output Current
2%.
Loading Condition 2.................... 75% of Derated Nameplate Output
Current 2%.
Loading Condition 3.................... 50% of Derated Nameplate Output
Current 2%.
Loading Condition 4.................... 25% of Derated Nameplate Output
Current 2%.
Loading Condition 5.................... 0%.
------------------------------------------------------------------------
(6) Input and output power measurements shall be conducted in
sequence from Loading Condition 1 to Loading Condition 4, as
indicated in Table 1. For Loading Condition 5, the unit under test
shall be placed in no-load mode, any additional signal connections
to the unit under test shall be disconnected, and input power shall
be measured.
(B) Proportional allocation method for loading multiple-voltage
external power supplies. For power supplies with multiple voltage
busses, defining consistent loading criteria is difficult because
each bus has its own nameplate output current. The sum of the power
dissipated by each bus loaded to its nameplate output current may
exceed the overall nameplate output power of the power supply. The
following proportional allocation method must be used to provide
consistent loading conditions for multiple-voltage external power
supplies. For additional explanation, please refer to section 6.1.1
of the California Energy Commission's ``Proposed Test Protocol for
Calculating the Energy Efficiency of Internal Ac-Dc Power Supplies
Revision 6.2,'' November 2007.
(1) Consider a multiple-voltage power supply with N output
busses, and nameplate output voltages V1, * * *, VN, corresponding
output current ratings I1, * * *, IN, and a nameplate output power
P. Calculate the derating factor D by dividing the power supply
nameplate output power P by the sum of the nameplate output powers
of the individual output busses, equal to the product of bus
nameplate output voltage and current IiVi, as follows:
[GRAPHIC] [TIFF OMITTED] TR01JN11.023
(2) If D >= 1, then loading every bus to its nameplate output
current does not exceed the overall nameplate output power for the
power supply. In this case, each output bus will simply be loaded to
the percentages of its nameplate output current listed in Table 1.
However, if D < 1, it is an indication that loading each bus to its
nameplate output current will exceed the overall nameplate output
power for the power supply. In this case, and at each loading
condition, each output bus will be loaded to the appropriate
percentage of its nameplate output current listed in Table 1,
multiplied by the derating factor D.
(C) Minimum output current requirements. Depending on their
application, some multiple-voltage power supplies may require a
minimum output current for each output bus of the power supply for
correct operation. In these cases, ensure that the load current for
each output at Loading Condition 4 in Table 1 is greater than the
minimum output current requirement. Thus, if the test method's
calculated load current for a given voltage bus is smaller than the
minimum output current requirement, the minimum output current must
be used to load the bus. This load current shall be properly
recorded in any test report.
(D) Test loads. Active loads such as electronic loads or passive
loads such as rheostats used for efficiency testing of the unit
under test shall be able to maintain the required current loading
set point for each output voltage within an accuracy of
0.5 percent. If electronic load banks are used, their settings
should be adjusted such that they provide a constant current load to
the unit under test.
(E) Efficiency calculation. Efficiency shall be calculated by
dividing the measured active output power of the unit under test at
a given loading condition by the active AC input power measured at
that loading condition. Efficiency shall be calculated at each
Loading Condition (1, 2, 3, and 4, in Table 1) and be recorded
separately.
(F) Power consumption calculation. Power consumption of the unit
under test at Loading Conditions 1, 2, 3, and 4 is the difference
between the active output power at that Loading Condition and the
active AC input power at that Loading Condition. The power
consumption of Loading Condition 5 (no-load) is equal to the AC
active input power at that Loading Condition.
(ii) Off Mode Measurement--If the multiple-voltage external
power supply unit under test incorporates any on-off switches, the
unit under test shall be placed in off mode and its power
consumption in off mode measured and recorded. The measurement of
the off mode energy consumption shall conform to the requirements
specified in paragraph (4)(b)(i) of this appendix. Note that the
only loading condition that will be measured for off mode is
``Loading Condition 5'' in paragraph (A), ``Loading conditions and
testing sequence'', except that all manual on-off switches shall be
placed in the off position for the measurement.
[FR Doc. 2011-12595 Filed 5-31-11; 8:45 am]
BILLING CODE 6450-01-P