Ah to kWh Converter
Convert battery charge capacity in amp-hours (Ah) to energy capacity in kilowatt-hours (kWh). Knowing the battery voltage is required.
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Ampere-hour ↔ Kilowatt-hour
Ah
kWh
Calculation Formula
(100 Ah × 12 V) ÷ 1000 = 1.2 kWh
Worked Example
Convert 200 Ah to kWh at 48V:
(200 Ah × 48 V) ÷ 1,000 = 9.6 kWh
Ampere-hour to Kilowatt-hour Table
| Ah | kWh (12V) | kWh (24V) | kWh (48V) |
|---|---|---|---|
| 50 Ah | 0.6 kWh | 1.2 kWh | 2.4 kWh |
| 100 Ah | 1.2 kWh | 2.4 kWh | 4.8 kWh |
| 200 Ah | 2.4 kWh | 4.8 kWh | 9.6 kWh |
| 300 Ah | 3.6 kWh | 7.2 kWh | 14.4 kWh |
| 400 Ah | 4.8 kWh | 9.6 kWh | 19.2 kWh |
| 500 Ah | 6 kWh | 12 kWh | 24 kWh |
Understanding the Conversion
Because a kilowatt-hour is 1,000 watt-hours, you multiply Ah by Volts to get Wh, then divide by 1,000 to find kWh.
Size your backup power system.
Use these converted ratings to determine exactly what size generator or battery bank you need.