Home Battery Backup Calculator
Check which appliances you want to keep running, enter your battery size, and see how many hours of power you get - with a side-by-side comparison of popular home batteries. All math runs in your browser. Nothing uploaded.
Backup hours + days
Essential vs whole home
DoD ?
Powerwall 3
Franklin WH
Generac PWRcell
Enphase IQ
Batteries needed
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hours of backup
- days
Daily load
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Usable capacity
?
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Batteries needed to reach target ?
Brand comparison at this load
Estimated installed cost shown. Actual prices vary by installer, region, and incentives. Hours shown per single battery unit.