Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Home Battery Sizing Calculator

Size a home battery bank for backup from the daily load you want to protect, your desired days of autonomy, usable depth of discharge, round-trip efficiency, and a reserve margin.

Daily load to back up (kWh/day)

Days of autonomy (no sun / grid) (days)

Usable depth of discharge (%)

Round-trip / inverter efficiency (%)

Reserve margin (headroom) (%)

Solar Energy

Off-Grid Solar System Calculator

Size your off-grid solar system by calculating required solar panels, battery bank, and inverter capacity. Essential for cabins, RVs, or remote installations without grid access.

Daily Energy Load (kWh)

Days of Autonomy

Peak Sun Hours (hours)

Battery Type

System Efficiency

Key differences

	Home Battery Sizing Calculator	Off-Grid Solar System Calculator
Category	Solar Energy	Solar Energy
Inputs required	5	5
Result	Battery capacity needed (kWh)	Total System Capacity (W)
What it does	Size a home battery bank for backup from the daily load you want to protect, your desired days of autonomy, usable depth of discharge, round-trip efficiency, and a reserve margin.	Size your off-grid solar system by calculating required solar panels, battery bank, and inverter capacity. Essential for cabins, RVs, or remote installations without grid access.