Adding a home battery to your solar system gives you backup power during outages and lets you store your own solar instead of selling it cheaply to the grid. But it adds cost. Here is when a battery is worth it in 2026, and when it is not.
What a Battery Does
- Backup power during grid outages (the panels alone shut off in an outage for safety; a battery keeps your home running).
- Stores your own solar to use at night instead of buying from the grid.
- Maximizes savings in states where exported solar earns a low credit (like California's NEM 3.0).
What It Costs
A home battery typically adds $10,000 to $20,000 before incentives, depending on size. Note the 2026 change: the 30% federal tax credit that used to cover battery storage expired on 31 December 2025, so a battery bought this year carries its full cost.
A Battery Is Worth It If...
- You live somewhere with frequent power outages and want backup.
- Your state credits exported solar at a low rate (a battery captures that value instead).
- You have time-of-use electricity rates and can shift battery power to expensive peak hours.
A Battery May Not Be Worth It If...
- Your state still offers full retail net metering (the grid already acts as your "battery").
- You rarely lose power and only care about bill savings.
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FAQ
Does the tax credit cover a battery?
It did through 2025. Section 25D expired on 31 December 2025, so a battery bought in 2026 gets no federal credit. Some state and utility storage rebates still exist - check your state page.
Do I need a battery to go solar?
No. Many homeowners go solar without one. A battery is most valuable for backup power or in states with low export credits.
Related
General 2026 guidance, not financial advice.