if you could tell me where I could get UL certified 43kWh battery for $5,400 I'd be very interested.

I don't know about 43kWH/5400$. But, here's the system I've been looking at:

https://www.expertpower.us/products/10800w-50kwh?_pos=2&_sid...

That's 50KWH of battery, plus the 10.8KW of solar, inverters, etc., all for $17K. That system is microgrid (not grid following) capable; so, you can run it during a blackout. The switchover is pretty good, too, so you don't need a second backup system.

	▲	mbesto a day ago \| parent \| next [-]
		I would definitely get EG4 over Expert Power for the reasons posted by other commentators. Example kit: https://signaturesolar.com/complete-off-grid-solar-kit-eg4-6... Add in a 15 kWh module and it's roughly the same price with better customer service, reliability, less parts, etc. However, I would just get an EG 18k PV, 45 kWh of EG5 batteries and 11.4 kW of solar panels from signature solar and that would cost you $18.5k
	▲	duffpkg a day ago \| parent \| prev [-]
		If I had to recommend in all in one kit, this september 2025, I would recommend an EG4 kit from Santan Solar. At brief glance they appear to be a stronger value and is from a company with a pretty strong customer service record. This is not sponsored in anyway.

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mbesto a day ago | parent | prev | next [-]

Ya, the OP is not telling the truth. One there isn't a "variety", second they aren't UL listed at that price. I've spent months researching this space for an off grid setup and these are the two best setups direct from China from a cost standpoint for 15 kWh. Neither are UL listed:

https://www.apexiummall.com/index.php?route=product/product&...

https://yixiangpower.com/products/yixiang-vertical-15kw-diy-...

Both would cost roughly $4800~$5500 for that total size.

If you want good customer service, dependable, UL listed, and correctly priced, then this is the king: https://signaturesolar.com/eg4-wallmount-indoor-battery-48v-...

UL listed ~45 kWh will cost you $10k, not $5.4k.

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duffpkg a day ago | parent | prev | next [-]

It would be multiple batteries totaling that. Stock and prices are constantly changing but RUiXU, EG4 and EcoWorthy are widely available brands with UL listed options. Will Prowse's website has a page dedicated to code compliant batteries and there are several long lists and excel sheets on the diysolarforum.

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mediaman a day ago | parent | prev [-]

I don't believe they are UL certified, but Dumfume sells 3.6kwh (300ah-12v) lifepo4 batteries for $320. 15 of those would get you 54kwh for <$5k. Might be tough to be anywhere near that point for UL certified only, though.

	▲	quickthrowman 17 minutes ago \| parent [-]
		It’s an NEC violation (and also incredibly reckless) to connect electrical equipment that has not been tested by a NTRL. [0] No inspector will sign off on a non-listed piece of electrical equipment, especially for a homeowner. I repeat, do not connect electrical equipment to your home’s electrical distribution network unless it is tested by one of the labs listed in the link below, especially if it is hardwired. [0] https://www.osha.gov/nationally-recognized-testing-laborator...