Battery Ah to kWh Calculator
Convert amp hours to kilowatt hours for battery energy storage
Battery Ah to kWh Calculator
Professional Battery Energy Calculations
Results:
Watt Hours (Wh): 0.00
Kilowatt Hours (kWh): 0.00
Megawatt Hours (MWh): 0.00
How to Use the Calculator
Battery Energy Calculation
- Enter the battery's amp hour (Ah) rating
- Input the battery voltage (V)
- Click calculate to get energy in kWh
- Results show Wh, kWh, and MWh values
Common Battery Types
- 12V Lead Acid: Standard automotive/marine
- 24V Systems: Medium power applications
- 48V Systems: Solar/wind energy storage
- Lithium: Various voltages available
Energy Storage Tips
- Higher voltage = more efficient systems
- Ah rating determines storage capacity
- kWh shows total energy available
- Consider depth of discharge limits
How to Convert Battery Ah to kWh
Turn any amp-hour rating into kilowatt-hours with a simple formula and real-life checkpoints.
1. Gather Battery Specs
Capture the amp-hour rating (at the published discharge rate), the nominal voltage, and how many batteries are wired in series or parallel.
- Series wiring raises voltage; Ah stays the same.
- Parallel wiring raises Ah; voltage stays the same.
2. Apply the Formula
The base conversion is energy (Wh) = Ah × V. Divide Wh by 1000 to get kWh.
- kWh = (Ah × V) ÷ 1000
- Multiply by the number of parallel strings to include combined capacity.
3. Real-Life Example
RV pack with four 12V, 100Ah lithium batteries wired 2S2P.
- Effective voltage = 24V (two in series).
- Effective capacity = 200Ah (two strings in parallel).
- kWh = (200 × 24) ÷ 1000 = 4.8 kWh available.
4. Adjust for Usable Energy
Most chemistries limit depth of discharge (DoD) for longevity.
- Lead-acid: multiply by ~0.5 for 50% DoD.
- LFP: multiply by 0.8–0.9 depending on BMS limits.
Battery Ah to kWh Chart
Quick reference values using kWh = (Ah × V) ÷ 1000 for popular system voltages.
12V Systems
| Amp Hours (Ah) | kWh @ 12V |
|---|---|
| 50 Ah | 0.60 kWh |
| 75 Ah | 0.90 kWh |
| 100 Ah | 1.20 kWh |
| 150 Ah | 1.80 kWh |
| 200 Ah | 2.40 kWh |
24V Systems
| Amp Hours (Ah) | kWh @ 24V |
|---|---|
| 50 Ah | 1.20 kWh |
| 75 Ah | 1.80 kWh |
| 100 Ah | 2.40 kWh |
| 150 Ah | 3.60 kWh |
| 200 Ah | 4.80 kWh |
48V Systems
| Amp Hours (Ah) | kWh @ 48V |
|---|---|
| 50 Ah | 2.40 kWh |
| 75 Ah | 3.60 kWh |
| 100 Ah | 4.80 kWh |
| 150 Ah | 7.20 kWh |
| 200 Ah | 9.60 kWh |
Multiply the kWh by total parallel strings or usable DoD percentage to plan realistic energy reserves.
Battery Ah to kWh FAQs
Straightforward answers to common conversion questions.
How many Ah is in 1 kWh?
Rearrange the formula Ah = (kWh × 1000) ÷ V. At 12V, 1 kWh equals about 83.3 Ah. At 24V it is 41.7 Ah, and at 48V it is 20.8 Ah.
How many kWh is in a 100Ah battery?
Multiply by voltage: 100Ah × 12V ÷ 1000 = 1.2 kWh for a single 12V battery. At 24V, the same 100Ah pack stores 2.4 kWh.
How to convert battery Ah to kWh?
Use kWh = (Ah × V) ÷ 1000. Plug in the battery’s amp-hour rating and nominal voltage, then divide by 1000 to convert watt-hours to kilowatt-hours.
How many kWh is a 200Ah battery?
At 12V, 200Ah delivers about 2.4 kWh. At 48V, the same 200Ah bank (typically configured as multiple batteries) delivers 9.6 kWh before DoD limits.
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