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Solar Battery Backup Calculator

Size a battery backup system for your home or business: add appliances, choose backup hours, and get a recommended battery, inverter and solar array size with PDF report.

Size a solar battery backup system for your home or business. Add your appliances, set backup hours, and get battery, inverter, and panel recommendations.

1. Appliances

Quick add:

2. System Settings

hrs
How long the battery must run without sun
hrs
Average daily effective sun hours
Battery bank nominal voltage
Affects usable depth of discharge
W
Wattage of one solar panel
%
Share of daily energy used while solar is producing

Sizing Results

Daily energy use
kWh/day
Battery size
Inverter size
kVA recommended
Solar array

How we sized it

  • Enter appliances and system settings to see the calculation breakdown.