EPA Revises Uninterruptible Power Supply Efficiency Requirements

Mon, 06/26/2017 - 11:07 -- MrGreen

The U.S. Environmental Protection Agency (EPA) is proposing changes to its ENERGY STAR® Uninterruptible Power Supply (UPS) efficiency program specifications.

Earlier this month, the EPA published version 1.1 of its current UPS program requirements. The biggest change in version 1.1 was the adoption of the U.S. Department of Energy’s (DOE) test method for UPSs (Uniform Test Method for Measuring the Energy Consumption of Battery Chargers incorporated in Appendix Y to Subpart B of 10 CFR 430). The DOE test method covers UPSs that operate at 115 V and 60 Hz, use a NEMA 1-15P or 5-15P plug, and have an output power rating ≤1,875 watts. UPSs with higher output power ratings will continue to use the version 1.0 ENERGY STAR UPS test method. This change is expected to have a minimal impact on efficiency performance. UPSs which were previously certified to Version 1.0 are not affected by this change, but will need to be tested to the DOE method for future versions.

In addition to finalizing version 1.1, the EPA has made the first draft of version 2.0 available for stakeholder comments. This draft includes the following key elements:

  • Efficiency requirements Tighter efficiency requirements are being proposed for voltage and frequency dependent (VFD), voltage independent (VI), and voltage and frequency independent (VFI) UPSs. Based on recent test data, the EPA believes that approximately 21% of available product will be able to meet the proposed version 2.0 levels, compared to almost 100% currently meeting version 1.0.
  • Communications and measurement requirements The EPA has removed the version 1 communications and measurement requirements and the one percentage point metering incentive.
  • Test Method In addition to adopting the DOE’s test method for UPSs with an output rating of ≤1,875 W, the EPA is also proposing some minor changes to its test method for higher powered UPSs, including a separate test method for high voltage DC output product and a thermal stabilization requirement only at the 100% reference test load.
Version 1.1 is effective immediately. Version 2.0 is expected to become finalized and effective by the end of the September 2018. A copy of the version 1.1 program specification can be downloaded here. For information on version 2.0 spec development activity, visit the ENERGY STAR UPS version 2.0 web page.