Sizing
How to Size a Home Battery for Solar
Calculate daily kWh, backup days, and inverter compatibility before you buy a LiFePO4 home battery.
8 min read · Beginner
Start with your daily energy use
Add up the kWh you use on a typical day (or use 24h of critical loads for backup-only systems). Multiply by backup days (1–3 for outages) to get a rough storage target. Add 20% for inverter losses and depth-of-discharge limits.
Match voltage to your inverter
Most whole-home LiFePO4 packs are 48V or 51.2V. Confirm your hybrid inverter or charge controller supports the battery BMS protocol before ordering.
Use our calculator
Our free battery calculator estimates pack count from daily kWh and budget. Then compare models in the shop filtered by capacity and Energy Score.