Solar Battery Storage: Cost, Payback, and Whether You Need One

A home battery isn't required to go solar, but for a growing number of homeowners it's become close to standard — mostly because of how utilities pay for exported power has changed, not because of blackouts alone.

What a battery actually costs

Home batteries generally run $800-$1,650 per usable kWh of storage installed, and a typical residential battery is sized 10-20 kWh. That puts a single battery in the $9,000-$18,000+ range before any state incentive, on top of your solar system cost. The federal standalone battery credit (also under the repealed Section 25D) expired alongside the solar credit for cash/loan purchases at the end of 2025.

Why batteries make more sense in some states than others

The economics come down to how your utility compensates exported solar. In states with strong retail-rate net metering (most of the country), a battery mostly buys you backup power during outages — nice to have, but not usually a fast financial payback on its own. In states like California under NEM 3.0, where export rates dropped sharply, storing your own surplus power and using it in the evening (instead of selling it cheap and buying it back expensive) can materially improve your system's overall payback, which is why the large majority of new California solar installs in 2026 include a battery.

State battery incentives that survived the federal repeal

• California SGIP: pays $200-$1,000+ per kWh of battery capacity, with higher tiers for wildfire/outage-prone areas.
• New York NYSERDA: battery rebates roughly $150-$250/kWh.
• Maryland: 30% state tax credit up to $5,000 for battery storage, independent of solar.
• Massachusetts SMART: adders for storage paired with solar.

Do you actually need one?

Ask yourself three questions: Does your state's export rate make selling surplus power a bad deal? Do you experience frequent outages? Do you want backup power for medical equipment or a well pump? If you answered yes to any of those, a battery is worth pricing out. If your state still has strong retail-rate net metering and reliable grid power, it's a reasonable thing to skip in year one and add later — most systems are designed to be battery-ready even if you don't install one immediately.