ENERGY STAR
ENERGY STAR® Program Requirements
for Single Voltage External Ac-Dc and Ac-Ac Power Supplies
Eligibility Criteria (Version 2.0)
Revised Final Draft
Table of Contents
Section 1: Definitions
Section 2: Qualifying Products
Section 3: Energy-Efficiency Specifications for Qualifying Products
Table 1: Energy-Efficiency Criteria for Active Mode: Standard Models
Table 2: Energy-Efficiency Criteria for Active Mode: Low Voltage Models
Table 3: Examples of Minimum Average Efficiency in Active Mode
Table 4: Energy Consumption Criteria for No-Load
Section 4: Test Methodology
Section 5: Effective Date
Section 6: Effective Date for ENERGY STAR Product Specifications
Table 5: Version 1.1 Energy-Efficiency Criteria for Active Mode
Table 6: Version 1.1 Energy Consumption Criteria for No-Load
Section 7: Future Specification Revisions
Section 8: International Efficiency Marking Protocol
Figure 1: Illustration of International Efficiency Mark
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ENERGY STAR
ENERGY STAR® Program Requirements
for Single Voltage External Ac-Dc and Ac-Ac Power Supplies
Eligibility Criteria (Version 2.0)
5 |	Revised Final Draft
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8	| Below is the .Revised Final Draft product specification (Version 2.0) for ENERGY STAR^qualified single
9	voltage external ac-ac and ac-dc power supplies. A product must meet all of the identified criteria if it is to
10	be qualified as ENERGY STAR by its manufacturer.
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12	The goal of this ENERGY STAR external power supply specification is to recognize those models with an
13	efficient ac-ac or ac-dc conversion process. This specification along with its complement, the specification
14	for products with battery charging systems (BCSs), intends to comprehensively cover the full range of
15	energy conversion products. Manufacturers shall carefully examine their product designs and compare
16	them to the detailed definitions (Section 1) and qualifying product descriptions (Section 2) for an external
17	power supply and battery charging system (visit http://www.enerqvstar.qov/products) to determine the
18	appropriate specification for ENERGY STAR qualification. Manufacturers may only qualify individual
19	models under the one specification (i.e., external power supply OR battery charging system) that best
20	reflects the power supply and product design.
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22	1) Definitions: EPA has prepared detailed definitions of single voltage external ac-ac and ac-dc power
23	supplies and other related terms as relevant to ENERGY STAR.
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25	A. External Power Supply (EPS): For the purposes of this specification, an external power supply:
26	a) is designed to convert line voltage ac input into lower voltage ac or dc output;
27	b) is able to convert to only one output voltage at a time;
28	c) is sold with, or intended to be used with, a separate end-use product that constitutes the
29	primary load;
30	d) is contained in a separate physical enclosure1 from the end-use product;
31	e) is connected to the end-use product via a removable or hard-wired male/female electrical
32	connection, cable, cord or other wiring;
33	f) does not have batteries or battery packs that physically attach directly (including those
34	that are removable) to the power supply unit;
35	g) does not have a battery chemistry or type selector switch AND an indicator light or state
36	of charge meter (e.g., a product with a type selector switch AND a state of charge meter is
37	excluded from this specification; a product with only an indicator light is still covered by
38	this specification); and
39	h) has nameplate output power less than or equal to 250 watts.
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Note: EPA has recently been made aware of EPS models that convert line voltage AC into multiple
USB (Universal Serial Bus) 5V outputs in parallel. These devices are being marketed for use with a
growing number of small consumer electronic devices designed to charge through computer USB
ports. To clarify, single voltage EPSs with multiple outputs of the same voltage are eligible for the
ENERGY STAR provided that they meet the Version 2.0 specification when tested as indicated in the
ENERGY STAR EPS Test Procedure. Information on testing single voltage EPSs with multiple output
wires can be found in the ENERGY STAR Test Procedure on page 6, "5. Measurement Approach"
under "a. Preparing UUT for Test."
One stakeholder recommended that EPA extend its EPS specification in the future to address EPSs
with two or more output voltages. However, the EPS Test Method does not currently cover units with
multiple output voltages and this would likely take some time to develop. EPA would welcome
discussions regarding these products in the coming months, which could lead to a future revision of
this specification, but does not want to delay finalizing Version 2.0.
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1 "Physical enclosure" refers to the housing of the products themselves, not their retail packaging.
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B.	Ac-Ac External Power Supply: An external ac-ac power supply is an EPS designed to convert line
voltage ac input into lower voltage ac output.
C.	Ac-Dc External Power Supply: An external ac-dc power supply is an EPS designed to convert line
voltage ac input into lower voltage dc output.
D.	Low Voltage External Power Supply: For the purposes of this specification, a low voltage model is
an EPS with a nameplate output voltage of less than 6 volts and a nameplate output current
greater than or equal to 550 milliamps.
E.	Model: An external power supply model that is sold or marketed under a unique model number or
marketing name. Any variation in the nameplate information (e.g., the rated input or output
voltage, amperage, or wattage), circuitry, or output cord size is considered a unique model.
F.	Active Mode: The condition in which the input of a power supply is connected to line voltage ac
and the output is connected to an ac or a dc load drawing a fraction of the power supply's
nameplate power output greater than zero.
G.	No-Load Mode: The condition in which the input of a power supply is connected to an ac source
consistent with the power supply's nameplate ac voltage, but the output is not connected to a
product or any other load.
H.	Power Factor (True): The true power factor is the ratio of the active, or real, power (P) consumed
in watts to the apparent power (S), drawn in volt-amperes (VA).
PF = £-
11 s
This definition of power factor includes the effect of both distortion and displacement.
Note: EPA has included a low voltage EPS definition to support the Active Mode requirements
included in the Revised Final Draft Version 2.0 specification. In addition, for clarity, an EPS model
definition has been added.
2)	Qualifying Products: In order to qualify as ENERGY STAR, an external power supply model must
meet the definition in Section 1 .A, as well as either the definition in 1 .B or 1 .C, and the specification
requirements provided in Section 3, below.
3)	Energy-Efficiency Specifications for Qualifying Products: Only those products in Section 2 that
meet all of the following criteria for Active Mode, Power Factor, and No-Load Mode may qualify as
ENERGY STAR.
Note: Below EPA provides its Revised Final Draft proposed requirements for the Version 2.0 EPS
specification. Based on EPA's dataset.,27.4% of the units would qualify as ENERGY STAR taking into
account the Active Mode and No-Load Mode requirements. (Compliance with the power factor
requirement was evaluated separately and is explained in the cover sheet to EPA's masked dataset.)
At stakeholders' request, EPA also carefully analyzed small subsets of the data based on rated output
power (i.e., < 1W, 1-5W, 5-10W, 10-20W, 20-30W, 30-40W, 40-50W, 50-100W, and >100W). EPA
feels that the proposed Active and No-Load Mode specifications represent the top performers across
the entire range, with significant compliance at all wattages; the lowest compliance rate being 1.7.6.%
for products betweenand the h[ghest compliance rate being 3.9.4% for products between 20-
30W.	
Some stakeholders suggested that an ENERGY STAR Version 2.0 specification was not needed
because of federal mandatory standards while others encouraged EPA to align ENERGY STAR
requirements with these new standards. EPA's research has shown that there is still room for

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sufficient product differentiation for products currently available above this minimum standard, which
justifies continuing a voluntary high efficiency label for EPSs.
A. Active Mode
To be eligible for ENERGY STAR qualification, an external power supply model must meet or
exceed a minimum average efficiency for Active Mode, which varies based on the model's
nameplate output power. Tables 1 and 2, below, outline the equations for determining minimum
average efficiency, where Pno stands for nameplate output power and Ln refers to the natural
logarithm. Table 1 addresses all standard EPSs, while Table 2 gives separate equations for a
subset of low voltage EPSs that meet the appropriate definition in Section 1 .D. All efficiency
values shall be expressed in decimal form and rounded to the hundredths place.
Table 1: Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies in Active
Mode: Standard Models
Nameplate Output Power (Pno)
Minimum Average Efficiency in Active
Mode (expressed as a decimal)2
0 to < 1 watt
> 0.4.80 * P„„ + 0.14a
> 1 to < 49 watts
> [0.0626 * Ln (Pn„)l + 0.622
> 49 watts
> 0.870
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Table 2: Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies
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Nameplate Output Power (Pno)
Minimum Average Efficiency in Active
Mode (expressed as a decimal)2
0 to < 1 watt
> 0.497 * Pno + 0.067.
> 1 to < 49 watts
> [0.0750 * Ln (Pno)l + 0.561,
> 49 watts
> 0.860
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Note on EPA Dataset: EPA has developed proposed new Active Mode levels for the Version 2.0
specification from a dataset of 1,651 units measured in 2006 or 2007, including: currently qualified
ENERGY STAR external power supplies; data shared with EPA from China's Standard Certification
Center (CSC); and a small set of new models purchased at US retail stores and tested on behalf of
EPA. Please note that the number of samples in the dataset was reduced from 1,834 for Draft 1 to
1,651 for this Revised Final Draft. The number of models is reduced as, based on stakeholder
requests, units capable of operating at multiple input voltages were analyzed based on measured
efficiency at both 115 volts and 230 volts (i.e., test data at 115 volts and 230 volts was treated as two
distinct units in the Draft 1 analysis and only as one unit in the Revised Final Draft analysis) in order to
be consistent with EPA's testing requirements in Section 4.C, below. This has generally resulted in a
consideration of the dataset such that each model is only evaluated for compliance once.
While the current dataset includes a large number of ENERGY STAR models, EPA does not feel that
this biases the analysis because: 1) new US regulations and regulations in other countrie^,wil[exceed
ENERGY STAR'S Tier 1 levels (Version 1.1 specification) as early as July 2008, making ENERGY
STAR models representative of the status quo and a good proxy for the US market in 2008; and 2)
Beginning in June 2007 and most recently in late December 2007, EPA has repeatedly invited
interested manufacturers to submit data for non-ENERGY STAR models for incorporation into the
dataset.
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(a) "Ln" refers to the natural logarithm. The algebraic order of operations requires that the natural logarithm
calculation be performed first and then multiplied by 0.0626 (or 0.0750 for low voltage models), with the resulting
output added to 0.622-for 0.561,for lowvoltage models), (b) An efficiency of 0.87 or 0.86 in decjmaKorrn
corresponds to the more familiar value of 87% or 86% when expressed as a percentage.
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Note on Active Mode Specification: In response to stakeholder feedback and based on further
analysis, EPA has revised the Active Mode requirements in this Revised Final Draft specification as
follows:
•	The proposed Revised Final Draft requirements follow the same form as the Version 1.1 and Draft
1 Version 2.0 requirements, with a sloped line below 1 watt, a log function for mid-wattage units,
and a flat line requirement above a certain wattage threshold. For the Revised Final Draft
Specification, based on stakeholder comments, the threshold for the flat line requirement has
been raised back to 49 watts from the 36 watts threshold used in Draft 1. This change makes the
criteria more consistent with the ENERGY STAR Version 1.1 specification and other international
specifications;
•	Separate requirements have been proposed for low voltage EPS models in recognition of design
constraints that limit the efficiency of low voltage, high current products; and
•	To account for stakeholder comments that the proposed Draft 1 requirements were too stringent
for some products, adjustments have been made to the equations for EPS models at or below 49
watts output power to ensure more consistent qualification rates across various wattage ranges.
For Active Mode alone. .33.4.% of the units in the dataset would meet the proposed Revised Final Draft
requirements. In addition, EPA also analyzed small subsets of the data based on the output power
range (i.e., < 1W, 1-5W, 5-10W, 10-20W, 20-30W, 30-40W, 40-50W, 50-100W, and >100W). EPA
feels that the proposed Active Mode specification allows for a reasonable compliance rate across the
different wattage ranges, with the lowest compliance rate being.20.5% for products between-1-5.W.
and the highest compliance rate being J54.5% for products between 20-30W. Finally, for products
between 25-42W, where some stakeholders expressed concerns about low compliance with the
proposed Draft 1 levels, the Revised Final Draft compliance rates are J54.5% for products between 20-
30W,35.2% for products between 30-40W. and.45.1 % for products between 40-50W.
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Examples to Illustrate the Active Mode Approach: Average Active Mode efficiency and
ENERGY STAR qualification shall be determined as follows:
Determine whether the product meets the definition for low voltage products by comparing the
nameplate output voltage and nameplate output current to the definition found in Section 1 .D.
Calculate the model's single average Active Mode efficiency for each test voltage by testing at
100%, 75%, 50%, and 25% of rated current output and then computing the simple arithmetic
average of these four values, as specified in the Test Method found in Section 4.
Based on the model's nameplate output power, select the appropriate equation from Table 1
or 2 and calculate the minimum average efficiency.
Compare the model's actual average efficiency to the minimum average efficiency required by
ENERGY STAR. If actual average efficiency is greater than or equal to the minimum average
efficiency, the model has satisfied ENERGY STAR'S Active Mode requirement.
To provide an example using the criteria in Table 1 and Table 2, the minimum average efficiencies
required of six sample power supplies are provided in Table 3 below. Power supplies 1 through 6
would meet the ENERGY STAR Active Mode requirement if they had average efficiencies greater
than or equal to the corresponding values shown in the far right column. Therefore, if Power
Supply 3 in Table 3 had an actual average efficiency of 80%, it would satisfy the Active Mode
requirement because it surpassed the ENERGY STAR minimum average efficiency of 79%.
Table 3: Examples of Minimum Average Efficiency in Active Mode
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Sample
Nameplate
Output
Power (Pno)
Nameplate
Output
Voltage
Nameplate
Output
Current
Average Efficiency in Active Mode
(expressed as a decimal)
PS 1
0.75 watts
1V
750 mA
0.497 * 0.75 + 0.067 = 0.4398 or 0.44
PS 2
0.75 watts
10V
75 mA
0.480 * 0.75 + 0.14Q = 0.5000 or 0.5a
PS 3
20 watts
5V
4000 mA
[0.0750 * Ln (20)1 + 0.561.= J857 or 0.79
PS 4
20 watts
10V
2000 mA
[0.0626 * Ln (20)1 + 0.622 = 0.8095 or 0.81.
PS 5
75 watts
5V
15000 mA
0.86
PS 6
75 watts
10V
7500 mA
0.87
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B. fower Factor Correction
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In addition to the Active Mode efficiency requirements found above, all qualifying power supplies
with greater than or equal to 100 watts input power must have a true power factor of 0.9 or greater
at 100% of rated load.
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Note: EPA believes it is important to retain a power factor level to help cut l-squared R losses in
building distribution wiring. In addition, EPA believes it is important to retain a power factor level
of 0.9 for high power devices to remain harmonized with the Computer V4.0 internal power supply
requirement. In Section 3.B above, EPA provides one proposed option for the power factor
requirement. Specifically, EPA has increased the cutoff for power factor correction to 100 watts of
input power in response to stakeholder comments that the proposed Draft 1 power factor
correction criteria were too difficult for many power supplies around the originally proposed 75
watt output power cutoff. With this new proposal, more than 80% of products in the dataset with
100 watts or more input power can meet the power factor criteria, with compliance dropping off
under the 100 watts threshold.
In addition, EPA is continuing to evaluate the merits of a second proposed option. In this second
option, qualifying EPSs would be required to have a true power factor of 0.9 or greater in any
measured condition where input power is greater than or equal to 100 watts. For example, an
EPS with a rated output power of 150 watts and a flat efficiency of 90% would have an input
power of approximately 167 watts at full load and 125 watts at 75% load, but only 83 watts at 50%
load. Thus, this unit would be required to achieve a power factor of 0.9 or greater at 100% load
and 75% load, but not at 50% load or less to be labeled as ENERGY STAR. Stakeholders are
encouraged to provide feedback on both power factor options as described in this note.
Based on comments from multiple stakeholders, EPA conducted research into eliminating the
power factor requirement and replacing it with the I EC/EN 61000-3-2 specification, which limits
harmonic currents. During EPA's research, the following issues were revealed:
•	Both the IEC and EN versions of the 61000-3-2 specification for harmonic currents have
levels based solely on greater than 220V input voltage, while the levels contained in the
Japanese version of the standard (JIS C 61000-3-2) base their levels on 100V testing.
Therefore, EPA's research found no applicable standard with corresponding levels based
on testing at 115V as required by the ENERGY STAR Version 2.0 specification; and
•	Although stakeholders indicated that the majority of manufacturers use active power
factor correction to meet this harmonic current specification (and therefore units meeting
this standard will ultimately have high power factor), it is also understood that certain
designs that meet this standard can result in a power factor well below ENERGY STAR'S
proposed 0.9 level (e.g., 0.75 or lower).
Although EPA believes an approach for harmonizing with this standard could ultimately be
developed, it would take additional research and testing, and EPA does not want this to delay
finalizing the Revised Final Draft specification. For these reasons, EPA has determined that
harmonization with this standard would not be appropriate at this time, and furthermore would not
meet EPA's continued goal of saving additional energy through increased power quality.	
C. No-Load Mode
The third element of the ENERGY STAR specification is the No-Load power requirement, which
specifies the maximum ac power that may be used by a qualifying ac-ac external power supply or
ac-dc external power supply in the No-Load condition. Maximum power consumption levels for
No-Load Mode are provided in Table 4, below.
Table 4: Energy Consumption Criteria for No-Load
Nameplate Output
Power (Pno)
Maximum Power in No-Load
Ac-Ac EPS
Ac-Dc EPS
0 to < 50 watts
< 0.5 watts
< 0.3 watts
> 50 to < 250 watts
< 0.5 watts
< 0.5 watts
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Note: EPA has not modified the proposed No-Load levels in this Revised Final Draft
specification. While a few stakeholders requested an increase in the maximum allowed power for
ac-ac models, EPA did not implement this change because it would have made ENERGY STAR'S
voluntary levels less stringent than the new US mandatory standards for EPSs, which will take
effect on July 1, 2008. For ac-ac EPSs in No-Load, the proposed Revised Final Draft ENERGY
STAR specification is identical to the 0.5 watt limit in the Energy Independence and Security Act of
2007.
For No-Load Mode alone,
Draft requirements.
r2.1% of the units jn the dataset would meet the proposed Revised Final
4) Test Methodology
The specifics for testing the energy efficiency of an external power supply model are outlined in a
separate document titled "Test Method for Calculating the Energy Efficiency of Single-Voltage
External Ac-Dc and Ac-Ac Power Supplies (August 11, 2004)," which is available on the ENERGY
STAR Web site. The test results produced by this procedure shall be used to determine if a model
qualifies as ENERGY STAR. In addition, below are five ENERGY STAR-specific testing requirements.
A.	Safety Standards: ENERGY STAR qualified external power supplies shall comply with applicable
safety standards from UL, CSA, and other global standards organizations. Relevant standards
include, but are not limited to:
UL 1012, Standard for Power Units Other Than Class2, Edition 7, April 29, 2005
UL 1310, Standard for Class 2 Power Units, Edition 5, May 3, 2005
It is the Partner's responsibility to ensure that its products meet applicable local safety standards
based on where the product will be sold.
B.	Number of Units Required for Test: Testing shall be conducted by the manufacturer or its
authorized representative on three randomly chosen units of the same model. Manufacturers shall
measure and maintain the Active Mode, Power Factor, and No-Load Mode values for all three
units as well as the average values. To qualify as ENERGY STAR, all three units must meet the
ENERGY STAR specification; only the average values will be displayed on ENERGY STAR'S
qualifying product list (see Section 4.E below).
C.	Models Capable of Operating at Multiple Voltage/Frequency Combinations: For switchmode
power supplies capable of operating at multiple voltages and frequencies, testing shall be
conducted at both 115 volts @ 60 Hz and 230 volts @ 50 Hz, with the least efficient set of test
values used to determine if products qualify for the Active Mode, Power Factor, and No-Load
specifications.
Note: Some stakeholders indicated that qualification at 115 volts and 230 volts was too onerous and
suggested alternative approaches, such as testing and qualification based on the region in which the
EPS would be sold or separate energy-efficiency requirements at 115 volts and 230 volts. After
careful consideration, EPA has retained the testing requirement at 115 volts and 230 volts for EPSs
capable of operating at multiple voltages and frequencies. ENERGY STAR qualifying EPSs are sold
into a global marketplace and are used in numerous countries by international travelers. By qualifying
models under the least efficient set of test values, this approach ensures that models meet the
ENERGY STAR performance levels in multiple markets and mitigates any potential variations in
tested values across markets. Consistent with this approach, EPA analyzed its dataset such that
qualification at 115 volts and 230 volts was required, where applicable. As noted earlier in this
document, the compliance rate based on the proposed requirements in this Revised Final Draft is in
accordance with ENERGY STAR'S desire to represent approximately the top 25% of models in terms
of energy efficiency.
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D.	Multiple Tap or Switch Selectable Models: Manufacturers shall test a multiple tap or switch
selectable model at the highest and the lowest voltage outputs of the power supply. If the model
meets or exceeds the ENERGY STAR requirements at both the highest and the lowest voltage
outputs, then it qualifies as ENERGY STAR.
E.	Submittal of Qualified Product Data to EPA: Partners are required to self-certify those product
models that meet the ENERGY STAR guidelines and report information to EPA. ENERGY STAR
qualifying product lists, including information about new models as well as notification of
discontinued models, must be provided on a quarterly basis, or more frequently if desired by the
manufacturer. If no new models are introduced during a particular quarter, manufacturer should
notify EPA to ensure its partnership status is maintained.
All unique EPS models, as defined in Section 1.E, must be separately tested and reported for
ENERGY STAR qualification. However, in some cases, a partner may have a base model
number with several extensions to reflect various input pin and output connector configurations. If
the only variation between the models is the physical connector configuration (provided that the
nameplate information, circuit design, and output cord length and gauge are the same), partners
may test one representative model and qualify it using a generic "XX" designation for the
extension in the model number.
When qualifying EPSs as ENERGY STAR, partners also have the option of qualifying a family of
EPSs that all meet the ENERGY STAR requirements, rather than individually submitting each
model. For ENERGY STAR'S purposes, an EPS model family is defined as a group of
switching-mode external power supplies that feature the same design (e.g., circuitry and
components), transformer, and output wattage, but differ in rated output voltage. To qualify
a model family, partners must provide the efficiency data (average of three test units) for the
highest and lowest output voltage members of the EPS model family that meet the ENERGY
STAR specification. When submitting model families, manufacturers continue to be held
accountable for any efficiency claims made about their external power supply products. In other
words, even though data may not be submitted to ENERGY STAR on each model, manufacturers
are still responsible for ensuring (and if challenged by another party, defending) each model's
compliance with ENERGY STAR within the model family.
Note: EPA has added the above two paragraphs addressing model number extensions for physical
connector configurations and EPS model family qualifications for ENERGY STAR. The requirements
are consistent with past correspondence with partners on this topic, including the Guide to Using the
Online Product Submittal System for External Power Supplies, which was prepared in November
2005.
5) Effective Date for EPS Manufacturers: The date that manufacturers may begin to promote products
as ENERGY STAR under Version 2.0 will be defined as the effective date of the agreement. The
ENERGY STAR single voltage external ac-ac and ac-dc power supplies (Version 2.0) effective date is
November 1, 2008. Any previously executed agreement on the subject of ENERGY STAR qualified
EPSs shall be terminated effective on October 31, 2008.
A. Product Qualification under Version 2.0: Prior to November 1, 2008, EPA will begin accepting
product qualifications under Version 2.0 through the ENERGY STAR online product submittal
system. All products, including models originally qualified under Version 1.1, with a date of
manufacture on or after November 1, 2008 must meet the new Version 2.0 requirements in order
to qualify as ENERGY STAR. The date of manufacture is specific to each unit and is the date
(e.g., month and year) on which a unit is considered to be completely assembled.
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366
367
368
369
370
371
372
373
374
375
376
377	6) Effective Date for ENERGY STAR Product Specifications
378
379	A. Computer and Imaging Equipment Specifications: To qualify as ENERGY STAR under the
380	Computer Version 4.0 Tier 1 and Imaging Equipment Version 1.0 Tier 1 specifications, computers
381	and imaging equipment with an EPS must meet the following requirements as provided in Tables
382	5 and 6. These requirements are identical to the EPS Version 1.1 specification, which was in
383	effect upon completion and implementation of the Computer and Imaging Tier 1 specifications.
384	Computers qualified under the Version 4.0 Tier 2 specifications (effective July 2009) and
385	Imaging Equipment qualified under the Version 1.0 Tier 2 specifications (effective April
386	2009) will need to meet the EPS Version 2.0 requirements. Refer to Section 3, Energy-
387	Efficiency Specifications for Qualifying Products, of this document for the detailed Version
388	2.0 EPS requirements.
389
390	• Computers and Imaging Equipment products that make use of an EPS must ensure that their
391	EPS meets or exceeds a minimum average efficiency for Active Mode, which varies based on
392	the model's nameplate output power. The following table outlines the equations for
393	determining minimum average efficiency where Pno stands for nameplate output power and Ln
394	refers to the natural logarithm. Efficiency shall be expressed in decimal form and rounded to
395	the hundredths place.
396
397	Table 5: Version 1.1 Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies in
398	Active Mode
Note: In this Revised Final Draft, EPA has extended the Version 2.0 specification effective date to
November 1, 2008. Given that EPA anticipates finalizing the specification in March, this November
effective date allows industry approximately nine months transition time prior to the new specification
taking effect. Further delays, as suggested by some stakeholders, are problematic given the new July
2008 US mandatory standards for EPSs, which render the current specification meaningless as a
designator of top performing products. In addition, EPA conveyed in its original Version 1.0
specification its intent to implement a more stringent follow-on specification and in fact has already
delayed the introduction of Version 2.0, which was originally slated for July 1, 2006.
EPA also has added new language in Section 5 above to clarify that the effective date is based on
the EPS unit's date of manufacture.
Nameplate Output Power (Pno)
Minimum Average Efficiency in Active
Mode (expressed as a decimal)
0 to < 1 watt
2 0.49 * Pno
> 1 to < 49 watts
> [0.09 * Ln (Pno)l + 0.49
> 49 watts
> 0.84
399
400
401
402
403
404
405
External Power Supplies must meet a No-Load power requirement, which specifies the
maximum ac power that may be used by a qualifying external power supply in the No-Load
condition. Maximum power consumption levels for No-Load Mode are provided in the table
below.
Table 6: Version 1.1 Energy Consumption Criteria for No-Load
Nameplate Output Power (Pno)
Maximum Power in No-Load
0 to < 10 watts
< 0.5 watts
> 10 to < 250 watts
< 0.75 watts
406
407
408
409
410
411
412
413
414
B. Primarily Portable Products with Qualified EPSs: To qualify as ENERGY STAR, primarily portable
products with EPSs that are not otherwise covered by the ENERGY STAR program (e.g., mobile
phones, MP3 speaker systems, water filtration systems) must meet the EPS Version 2.0
specification as of July 1, 2008. Visit
http://www.enerqystar.gov/index.cfm?c=ext power supplies pd.CE manufacturers for more
information about this product category.
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416
417
418
419
420
421
422
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424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
C. Other Electronic Product Specifications: EPA is committed to advancing power supply efficiency in
all products as quickly as is reasonable. For Telephony, the EPSs are a central part of this
specification and thus must meet Version 2.0 as of its effective date, as outlined in Section 5,
above. For Monitors, Televisions, Set-top Boxes, and Audio/DVD, updated specifications will
specifically require that any EPSs meet the Version 2.0 requirements. Manufacturers should refer
to the latest electronic product category specification for relevant effective dates.
Note: As requested by stakeholders, EPA has added a new Section 6: Effective Date for ENERGY
STAR Product Specifications to this Revised Final Draft EPS specification. This additional language
is provided to clearly and formally outline EPA's intentions with regards to EPS requirements to both
EPS manufacturers and their end-use product customers.
7)	Future Specification Revisions: EPA reserves the right to change the specification should
technological and/or market changes affect its usefulness to consumers, industry, or the environment.
In keeping with current policy, revisions to the specification are arrived at through stakeholder
discussions. In the event of a specification revision, please note that ENERGY STAR qualification is
not automatically granted for the life of a product model. To qualify as ENERGY STAR, a product
model must meet the ENERGY STAR specification in effect on the model's date of manufacture. The
date of manufacture is specific to each unit and is the date on which a unit is considered to be
completely assembled.
8)	International Efficiency Marking Protocol: ENERGY STAR partners shall follow the international
efficiency marking protocol to indicate the energy performance of their ENERGY STAR qualified
power supplies. (See Figure 1 for an illustration of the international efficiency mark.) In addition, the
efficiency level, as denoted by a Roman numeral under the protocol, shall be reported to EPA as part
of the qualified product data submission process. Further information about the endorsers of the
marking protocol and its intent is available at www.enerqvstar.gov/powersupplies.
ENERGY STAR partners shall clearly and permanently mark (e.g., imprint, label, etc.) the nameplate
of their qualifying external power supplies with the appropriate Roman numeral (I - VI) that
corresponds to specific minimum Active and No-Load efficiency levels. (See
www.eneravstar.gov/powersupplies and click on "International Efficiency Marking Protocol" for energy
performance requirements at each Roman numeral.) Partners shall determine the appropriate Roman
numeral by: 1) comparing the unit's Active and No-Load test data (when tested in accordance with the
ENERGY STAR Test Method and at each relevant test voltage and frequency value) with the
performance requirements at each level of the Roman numeral scale; and 2) choosing the highest
Roman numeral where the power supply meets the Active and No-Load requirements.
Figure 1: Illustration of International Efficiency Mark
Brand Model
BATTERY CHARGER for uu with
Information Technology Equipment
AWARNING
For use with	rechargeable
Li-ion Battery Peek EN-ELI.
Non serviceable parts inside.
455
456
457
458
459
SBiWSEE
WUT 100-I40V~ 50'SCMi
0ISA-01A IJ-UVA
OUTPUT *4V*"0«A
EFFICIENCY LEVELi ^ -
ABC CORP., AUSTRALIA

When applied by a manufacturer, the mark shall conform to the following characteristics:
Format:	Roman numeral: I, II, III, IV, V, or VI.
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460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
Font:	Times Roman preferred (or other plain serif fonts).
Size:	Legible and indelible.
Color:	Text to contrast with the nameplate background.
Placement: On the power supply nameplate; however, the exact location is at the discretion of the
manufacturer. The text "Efficiency Level" shown above is optional.
Example: Any external power supply meeting the performance requirements for level V and
above would qualify as ENERGY STAR (Version 2.0). Power supplies with
performance levels of I - IV would not qualify under the Version 2.0 Specification.
Note: The international community has reserved level V of the international efficiency marking
protocol for ENERGY STAR'S Version 2.0 specification. Once the Version 2.0 specification is
finalized, the protocol will be amended with the new requirements for level V and only EPSs with level
V efficiency levels will qualify as ENERGY STAR. In addition, EPA plans to include updated
information about the marking protocol on its ENERGY STAR Web site, once the Version 2.0
specification is finalized.
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