Solar Battery Sizing Calculator
Calculate battery storage capacity needed for solar backup.
Inputs
kWh
hours
%
V
%
Results
Required Capacity
19.5 kWh
Required Amp-Hours
407 Ah
Backup Energy Needed15 kWh
13.5 kWh Batteries Needed2
How to Use This Calculator
- Enter your daily energy consumption in kWh.
- Set the number of backup days desired during a grid outage.
- Input the battery depth of discharge (DoD) — typically 80–90% for lithium batteries.
- Enter your solar generation in kWh/day to account for partial solar recharge.
- Review the recommended battery capacity in kWh and the number of battery units required.
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