Reference 1
- Load
- 300 W
- Backup
- 3 hours
- 12V battery
- 90-110 Ah
- Suggested inverter
- 500 VA
दैनिक
Inverter Battery Calculator
Calculate required inverter VA and battery Ah from lights, fans, TV load, backup duration, battery voltage, power factor, and efficiency.
सूत्र व्याख्या
Inverter VA = load watts / power factor; Battery Ah = load watts x backup hours / (battery voltage x efficiency)Inverter sizing converts real load watts into VA using power factor, while battery sizing estimates amp-hours needed after inverter and battery losses.
Step-by-Step Example
- 1Add fan, light, and electronics loads to get total watts.
- 2Divide watts by the selected power factor and add reserve margin for inverter VA.
- 3Multiply load by backup hours to get watt-hours.
- 4Divide watt-hours by battery voltage and efficiency, then add a reserve margin for battery Ah.
Reference
Benchmark Table
Compare common scenarios quickly. Scroll horizontally on smaller screens.
Reference 2
- Load
- 500 W
- Backup
- 4 hours
- 12V battery
- 200-230 Ah
- Suggested inverter
- 800 VA
Reference 3
- Load
- 800 W
- Backup
- 4 hours
- 12V battery
- 320-360 Ah
- Suggested inverter
- 1,250 VA
प्रायः सोधिने प्रश्नहरू
Divide the total connected watt load by the inverter power factor. This calculator assumes 0.8 and adds reserve margin.
Multiply load watts by backup hours, then divide by battery voltage and efficiency.
Reserve margin helps handle starting surges, inverter losses, battery aging, and real-world load variation.
This calculator is intended for common home loads like fans, lights, and TV. ACs need separate surge and compressor-load sizing.
Recommended battery capacity
190 Ah