Ah to kWh Calculator
Convert amp-hours (Ah) to kilowatt-hours (kWh): kWh = Ah × V ÷ 1,000. See how much energy a battery bank stores and how long it can power your home.
Ah
V
ENERGY
1.2 kWh
IN Wh
1,200 Wh
FORMULA
kWh = Ah × V / 1000
Ah to kWh — Battery Table
| Ah | 12V | 24V | 36V | 48V |
|---|---|---|---|---|
| 10 Ah | 0.12 kWh | 0.24 kWh | 0.36 kWh | 0.48 kWh |
| 20 Ah | 0.24 kWh | 0.48 kWh | 0.72 kWh | 0.96 kWh |
| 50 Ah | 0.6 kWh | 1.2 kWh | 1.8 kWh | 2.4 kWh |
| 100 Ah | 1.2 kWh | 2.4 kWh | 3.6 kWh | 4.8 kWh |
| 150 Ah | 1.8 kWh | 3.6 kWh | 5.4 kWh | 7.2 kWh |
| 200 Ah | 2.4 kWh | 4.8 kWh | 7.2 kWh | 9.6 kWh |
| 300 Ah | 3.6 kWh | 7.2 kWh | 10.8 kWh | 14.4 kWh |
| 400 Ah | 4.8 kWh | 9.6 kWh | 14.4 kWh | 19.2 kWh |
| 500 Ah | 6 kWh | 12 kWh | 18 kWh | 24 kWh |
💡 How to Convert Ah to kWh
To convert Ah to kWh, multiply the amp-hours by the battery voltage and divide by 1,000. Kilowatt-hours are the same unit your electricity bill uses, so this conversion lets you compare battery storage directly with your home's energy use.
Ah to kWh formula
kWh = Ah × V ÷ 1,000
Example: 100 Ah at 12 V → 100 × 12 ÷ 1,000 = 1.2 kWh
Example: 100 Ah at 12 V → 100 × 12 ÷ 1,000 = 1.2 kWh
Worked examples
- Four 12 V 200 Ah batteries in series (48 V, 200 Ah): 200 × 48 ÷ 1,000 = 9.6 kWh.
- Same four batteries in parallel (12 V, 800 Ah): 800 × 12 ÷ 1,000 = 9.6 kWh. Series or parallel, the energy is the same.
- 280 Ah LiFePO4 cells in a 16-cell 51.2 V pack: 280 × 51.2 ÷ 1,000 = 14.34 kWh.
Ah to kWh table
| Ah | 12 V | 12.8 V | 24 V | 48 V | 51.2 V |
|---|---|---|---|---|---|
| 50 | 0.6 | 0.64 | 1.2 | 2.4 | 2.56 |
| 100 | 1.2 | 1.28 | 2.4 | 4.8 | 5.12 |
| 150 | 1.8 | 1.92 | 3.6 | 7.2 | 7.68 |
| 200 | 2.4 | 2.56 | 4.8 | 9.6 | 10.24 |
| 280 | 3.36 | 3.584 | 6.72 | 13.44 | 14.336 |
| 300 | 3.6 | 3.84 | 7.2 | 14.4 | 15.36 |
| 400 | 4.8 | 5.12 | 9.6 | 19.2 | 20.48 |
| 600 | 7.2 | 7.68 | 14.4 | 28.8 | 30.72 |
Series and parallel connections
Connecting batteries in series adds their voltages and keeps the Ah the same; connecting them in parallel adds their Ah and keeps the voltage the same. Either way, total kWh is the sum of the individual batteries' energy.
Rated versus usable energy
The result is the battery's rated energy. You get less in practice because:
- Depth of discharge: lead-acid batteries are commonly kept above 50% charge to protect their life, while LiFePO4 batteries are often used to 80–100% of capacity.
- Inverter losses: converting battery DC to household AC typically loses about 5–15%.
- Discharge rate: lead-acid capacity is usually quoted at a slow 20-hour rate; drawing current faster yields fewer amp-hours (the Peukert effect).
kWh = Ah × volts ÷ 1,000. A 100 Ah battery is 1.2 kWh at 12 V or 4.8 kWh at 48 V.