Solar Battery
A lithium-ion energy storage system paired with rooftop solar that stores daytime production for use at night or during grid outages.
Quick answer
Solar Battery: A lithium-ion energy storage system paired with rooftop solar that stores daytime production for use at night or during grid outages. Typical cost: $10,000–$18,000 for a single 10–13 kWh battery installed..
Why it matters
Batteries qualify for the 30% federal credit even on existing solar systems. They're the only way to keep solar producing during a grid outage on most modern inverter systems.
Typical cost
$10,000–$18,000 for a single 10–13 kWh battery installed.
Pros
- • Backup power during outages
- • 30% federal tax credit
- • Time-of-use rate savings
- • Pairs with EV charging
Cons
- • 10-year warranty vs 25 for panels
- • Heavy and requires wall or floor mounting
- • Not all utilities pay for stored exports
Common uses
- • Backup power
- • Time-of-use rate arbitrage
- • Off-grid or grid-defection setups
Alternatives
Whole-home generatorPortable power station
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Frequently asked questions
- How long do solar batteries last?
- 10–15 years on the warranty; physical lifespan often 12–18 years before significant capacity loss.
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