UL 9540
Energy Storage Systems and Equipment
Also written as ANSI/CAN/UL 9540
- Issuing body
- UL Standards & Engagement
- Current edition
- 3rd edition
- Published
- 2023-06-28
- Last verified
- 2026-08-22
Base edition confirmed and re-verified 2026-08-22. The third edition is being revised in place (residential installation annex, March 2027 compliance date); no fourth edition is established.
What it covers
The system-level listing standard for energy storage in North America. Where the component standards address cells and batteries, this one addresses the assembled product — the battery, conversion equipment, controls and enclosure evaluated together as a complete system. A UL 9540 listing is the certification most often named in permitting and procurement documents.
Editions
- 3rd edition In force 2023-06-28
The third edition remains the base document but is under active revision. A revision approved in March 2025 added a new annex covering residential energy storage installation instructions, carrying a compliance date of March 2027.
- 2nd edition Superseded
Next edition & pipeline
Official source
learnBESS doesn't host or reproduce standards. Read or purchase the document from the issuing body.
View UL 9540 at UL Standards & Engagement ↗