UL 9540 Listed Batteries and Inverters
UL 9540 is the safety listing for a complete energy storage system, and it’s what many building departments look for when you permit a home battery. Every product here carries a UL 9540 listing, on its own or as part of a listed battery and inverter pairing, from EG4, Sol-Ark, Pytes, Fortress Power, MNP, and Renon.
Pairings matter, so check the listing on each product page. The guide below the products breaks down what each UL standard covers.
Fortress Power eBoost 16 + eWay Bundle, 48V 16kWh LiFePO4 Battery with Wire Management System, Optional 750A Busbar, 314Ah, IP65, UL 1973 & UL 9540
16kWh of storage with a built-in wireway to keep wiring clean
Fortress Power eForce 48V Stackable LiFePO4 Battery, 9.6kWh Per Module, IP65 Heated Enclosure, Quick-Plug Installation, Up to 153kWh Scalable
Stackable, easy to wire and natively pairs with Fortress Power inverters
EG4 LifePower4 V2 48V 100Ah 5.12kWh LiFePO4 Server Rack Battery, UL 1973 Listed, UL 9540A Tested Lithium Battery
Budget friendly version server-rack battery, cross-compatible with EG4-LLAsk About This
Sol-Ark 15K-2P 48V All-in-One Hybrid Inverter, 12kW-15kW AC Output, 19.5kW PV Input, UL 1741 & UL 9540 Lithium Battery Inverter
All-in-one 48V powerhouse, with EMP hardening if you want it
EG4 12kPV 48V 8kW Hybrid All-in-One Inverter, 12kW Solar Input, NEMA 4X, UL 1741 & UL 9540 Solar Inverter
EG4's compact hybrid, still packing 80A of passthroughAsk About This
Pytes E-Box 48100R 100Ah 5.12kWh Server Rack Battery, UL 1973 & UL 9540 Lithium Battery
UL 9540 certified and scalable all the way to 491.5kWhNewer Version Available
Sol-Ark + Pytes UL9540 Certified Customizable ESS Solution
UL 9540 certified pairings of Sol-Ark and Pytes V5
Sol-Max (formerly MNP) MNPowerflo5 48V 100Ah 5.12kWh LiFePO4 Server Rack Battery, UL 1973 & UL 9540 Lithium Battery
MidNite's own server rack battery for ESS buildsAsk About This
UL 9540 vs 9540A vs 1973 vs 1741: What Each One Covers
UL 9540
The complete energy storage system: battery, inverter, and controls working together
Listing
What residential codes and permit reviewers usually ask for
UL 9540A
How a battery behaves in thermal runaway and whether fire spreads between units
Test method, not a listing
Building and fire officials use the results to set spacing and install locations
UL 1973
The battery module or pack itself
Listing
A building block of a UL 9540 system, but not a system listing on its own
UL 1741
The inverter and how it connects to the grid
Listing
Utilities look for it, often the SB version, before approving a grid-tied or hybrid system
1. Check what the listing covers
Many batteries are UL 9540 listed only when paired with specific inverters. The EG4 LifePower4 V2, for example, carries UL 9540 with the EG4 18kPV. A pairing outside the listed combination may not carry the listing, so match the battery and inverter before you order. Not sure which pairings are listed? Contact our support team and we’ll help you match them.
2. Talk to your building department early
Requirements vary by city and county. The IRC and NFPA 855 both point to UL 9540 for home energy storage, and many building departments ask to see the listing with your permit application. A quick call before you order can save a redesign later.
3. Install it the way it was listed
A listing assumes the system goes in per the manufacturer’s installation manual, including clearances, mounting, and location. Follow the manual and keep it handy for your inspection.
UL 9540 FAQ
If you’re pulling a permit for a home battery, there’s a good chance. Jurisdictions that adopt the IRC or NFPA 855 generally expect a listed energy storage system, and UL 9540 is the listing they look for. Rules vary by location and application, so check with your local building department before you order.
UL 9540 is a listing for the complete system. UL 9540A is a fire test that shows how a battery behaves in thermal runaway. It produces a report, not a listing, so a battery can have 9540A test data without being UL 9540 listed.
Not always. Many listings cover a specific battery and inverter combination, and a pairing outside it may not carry the listing. Contact our support team and we’ll help you find a listed match.
UL 1973 covers the battery itself. It’s part of what goes into a UL 9540 system, but on its own it isn’t a system listing. If your building department asks for UL 9540, look for the battery as part of a listed system.
UL 9540 covers the whole system, so inverters that were listed together with specific batteries carry it too. Ask our team which batteries each inverter is listed with.