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

Solar Load Calculator

Calculate the total daily energy demand of your home's lighting, appliances, and HVAC to correctly size a solar system. Use this before getting solar quotes to know exactly how many kilowatt-hours per day you need to generate.

Lighting Load (watts)

Appliances Load (watts)

HVAC Load (watts)

Average Daily Usage (hours)

System Efficiency Factor

Key differences

	Home Battery Sizing Calculator	Solar Load Calculator
Category	Solar Energy	Solar Energy
Inputs required	5	5
Result	Battery capacity needed (kWh)	Required Solar Capacity (kW)
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.	Calculate the total daily energy demand of your home's lighting, appliances, and HVAC to correctly size a solar system. Use this before getting solar quotes to know exactly how many kilowatt-hours per day you need to generate.