Transparent calculator
Portable power station sizing calculator
Estimate energy capacity and inverter requirements without selecting a product. No products or paid links—just an explainable result.
Estimated minimum capacity
735 Wh
- Device energy
- 520 Wh
- Continuous output
- 65 W
- Surge output
- 65 W
520 Wh ÷ 85% efficiency × 1.20 reserve = 735 Wh.
How this estimate works
Add wattage multiplied by runtime and quantity, adjust for conversion efficiency, then add the selected reserve.
Energy is power over time: watts × hours = watt-hours. Capacity and inverter output are separate constraints, so the result reports both.
Know the limits
- Actual runtime varies with temperature, battery age, inverter behavior, and manufacturer limits.
- The estimate is not an electrical-safety assessment or an emergency-runtime guarantee.
- Verify running and surge requirements against the device and power-station manuals.
Sources
- Basics of Electricity, Energy, National Renewable Energy Laboratory. Retrieved .