Big Milestone: Our 48V 100Ah Battery Is Now UL9540 Certified
Why this matters for our 48V 100Ah battery It means our battery is not just a battery pack — it is an America safety-certified home energy storage solution with higher installation acceptance, stronger reliability, and greater long-term user confidence.
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Cubix 100 · UL 9540 Certified — ECO-WORTHY
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Permits, Inspectors & Insurance
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Why do my local authorities (AHJ) care so much about this certificate?
The Authority Having Jurisdiction — your local fire marshal or building inspector — has final say on your installation. They follow the National Electrical Code (NEC) and International Fire Code (IFC), both of which now mandate UL 9540 for residential installations. Without it, an inspector can refuse your permit and a licensed electrician may refuse to wire your system.
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Will this affect my homeowners' insurance?
Yes. Insurance companies are increasingly strict about non-certified lithium systems. If a fire occurs and your system lacks UL 9540 certification, the insurer may use "unauthorized equipment" as grounds to deny your claim.
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Flexibility & Compatibility
Q
Can I use the Cubix 100 with other brands of inverters?
Yes — and this is our core competitive advantage. Our DC ESS certification means the Cubix 100 is certified to integrate with any UL 1741-certified inverter that meets our electrical parameters. While some brands lock you into their ecosystem, we give you the flexibility to build the system you want, legally.
Q
What's the difference between AC ESS and DC ESS?
DC ESS Flexible
Certifies the battery and its management system. Pairs with any UL 1741-certified inverter — ideal if you already own a compliant inverter.
AC ESS ★ Complete
Battery + inverter certified together as one unit. The fastest, clearest path through AHJ approval — no compatibility questions.
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Deep-Dive Safety: UL 9540 vs. UL 9540A
Q
I've heard about UL 9540A — is that the same thing?
Not quite. UL 9540 is the standard — the pass/fail certification for the whole system. UL 9540A is the test method — specifically for thermal runaway. We've completed 9540A testing, which produces a detailed data report showing that even if one cell fails, fire will not spread beyond the unit. This is often what fire marshals use to determine how close a battery can be installed to doors or windows.
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Is this certification relevant to you?
You need a UL 9540 certified system if any of these apply:
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You live in a city or suburb that requires building permits for energy storage.
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You plan to connect to the grid — utility companies require UL 9540 for interconnection approval.
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You want your homeowners' insurance to remain valid in the event of an incident.
For full certification files, product specifications, and installation details, visit our product page anytime. And if you need assistance, our team is always ready to help
— we’re dedicated to providing trusted products and support you can rely on.