Is a Home Battery Backup Worth It?

What a home battery does

A home battery stores electricity, either from your solar panels or from the grid, and releases it when you need it. During an outage it can power some or all of your home. On a normal day it can shift solar energy you made at noon to the evening, when power often costs more.

When a battery pays off

• You lose power often, or for long stretches
• Your utility pays little for the solar power you send back to the grid
• You're on a time-of-use rate plan with expensive evening hours
• Someone in your home relies on medical equipment or needs a working well pump
• Local utility incentives offset part of the cost

When you can probably skip it

If outages are rare in your area and your utility credits exported solar at full retail value, a battery may take a long time to pay for itself. In that case, a small portable power station for essentials may be enough.

Specs that matter

• Usable capacity (kWh): how much energy the battery stores
• Continuous and peak power (kW): whether it can start your AC or well pump
• Round-trip efficiency: how much stored energy you get back out
• Warranty: years, cycles, and guaranteed capacity at the end of the warranty
• Chemistry: LFP (lithium iron phosphate) batteries are known for long life and thermal stability

Battery vs. generator

A standby generator can run for days as long as it has fuel, and it often costs less upfront. A battery is silent, needs no fuel deliveries, and can save you money every day when paired with solar. In outage-prone areas, some homeowners use a battery for daily use and short outages, plus a small generator for long emergencies.

A typical 13.5 kWh home battery cost about $15,600 installed, before incentives, in the first half of 2026. A single battery for essential circuits can run $5,000–$18,000, while whole-home backup with two or three batteries often costs $24,000–$40,000. The federal tax credit for home batteries ended in 2025, but many states and utilities still offer rebates.