What this converter does
This converter turns kilowatt-hours into ampere-hours and back. Since energy equals charge times voltage, enter the bank voltage — 48 V by default. Type a value and read the result as you type.
Sizing a battery bank from a target kWh means converting to Ah at the pack voltage, which this tool does directly.
The units it covers
Charge (Ah) and energy (kWh) are linked by the battery voltage — energy is charge times voltage.
View all units & their values
| Unit | Symbol | Value | Mainly used |
|---|---|---|---|
| Ampere-hour | Ah | charge | Battery charge rating |
| Kilowatt-hour | kWh | energy | Usable stored energy |
| Voltage | V | input | Nominal battery/bank voltage |
The formula
Energy equals charge times voltage, so ampere-hours and kilowatt-hours relate through the voltage:
kWh = Ah × V ÷ 1000Where:
- Ah = charge in ampere-hours
- kWh = energy in kilowatt-hours
- V = nominal bank voltage
Worked example
Convert 10 kWh at 48 V to Ah.
Ah = kWh × 1000 ÷ V10 × 1000 ÷ 48 = 208.3 AhSo 10 kWh at 48 V needs about 208 Ah of battery.
The units in this example
A unit of energy — the usable stored capacity of a battery bank and the unit utilities bill in.
- 1 kWh = 1,000 Wh
- Ah = kWh × 1000 ÷ V
- 10 kWh @48V = 208 Ah
- Ah × V ÷ 1000 = kWh
A unit of electric charge — the cell-level capacity rating for solar, home and EV batteries.
- 1 Ah = 1,000 mAh
- kWh = Ah × V ÷ 1000
- 208 Ah @48V = 10 kWh
- 100 Ah @12V = 1.2 kWh