Question 1

What does your matchmaking service cost?

Accepted Answer

Nothing. The installer pays us a flat referral fee. That fee is the same whether you buy a $9,000 home battery or a $24,000 stack, so we have no incentive to upsell you.

Question 2

Will my information be sold to multiple installers?

Accepted Answer

No. Your information goes to one home battery installer (the one we match you with) and nowhere else. No marketing partners, no resellers, no follow-up calls.

Question 3

What if I already have a home battery quote?

Accepted Answer

Great. Send it over. We'll either confirm it's a fair deal or tell you where it's off. No charge either way.

Question 4

How do you choose which home battery to recommend?

Accepted Answer

Your home's electrical service, your reason for backup, your existing solar (if any), and your roof or wall layout. The right answer is rarely the biggest box.

Question 5

Are you affiliated with the government or a utility?

Accepted Answer

No. We are a private company, WattKeeper LLC doing business as Solar Battery USA. We are not a government program, a utility, or a state agency.

Question 6

What happens after I submit the application?

Accepted Answer

A human reads your application within two business days, calls you to confirm the details, and emails one home battery installer match with an introduction. You take it from there or you don't.

Question 7

How much does a home battery cost in 2026?

Accepted Answer

A single-unit home battery typically runs $9,000 to $17,000 installed for a 10-15 kWh system, before incentives. A whole-home stack of two or three units runs $20,000 to $35,000. The 30% federal tax credit through 2032 takes thousands off the real cost, and state rebates (SGIP in California) can drop it further. We match you with an installer who'll give you a written quote. There are no fees on our end.

Question 8

How long does a home battery last?

Accepted Answer

Most modern home batteries use LFP (lithium iron phosphate) chemistry and come with 10- to 15-year warranties. They're rated for 4,000 to 15,000 charge cycles. Real-world expectancy is 10-15 years of useful life before significant capacity loss. Sonnen's evo carries a 15,000-cycle warranty, the longest in the category. Tesla's Powerwall 3 and FranklinWH's aPower 2 both come with 10-year warranties.

Question 9

Does a home battery work during a power outage?

Accepted Answer

Yes, if it's installed correctly. A grid-tied battery without backup configuration shuts off during an outage for utility-worker safety. A properly-installed battery with a critical-loads panel or whole-home transfer switch will island your home from the grid and keep your circuits running. Every installer we match you with has done islanding-mode commissioning on the chemistry they're recommending.

Solar batteries for American homes, one expert match.