1000Wh to Ah — 83.3 Ah at 12V
1000 Wh is 83.3 Ah at 12V, 41.7 Ah at 24V, and 20.8 Ah at 48V. Below: usable energy per chemistry, what it runs, and which module count gets you there.
1000 Wh at 12V is 83.3 Ah of battery capacity.
Formula: Ah = Wh ÷ V. Divide by the nominal battery voltage of the bank, not by the charger voltage.
Result
Energy in Wh equals capacity in Ah multiplied by battery voltage. 1000 Wh equals 1 kWh.
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Design Your SystemAt every system voltage
The same capacity stores four times the energy at 48V that it does at 12V, and draws a quarter of the current for the same load.
| System voltage | Capacity | Energy | kWh |
|---|---|---|---|
| 12 V | 83.3 Ah | 1,000 Wh | 1 |
| 24 V | 41.7 Ah | 1,000 Wh | 1 |
| 48 V | 20.8 Ah | 1,000 Wh | 1 |
How much of it you can actually use
Nameplate energy is not usable energy. Depth of discharge caps what you may take out before you damage the battery, and it differs by chemistry.
| Chemistry | Depth of discharge | Usable energy | Usable capacity | Cycles at that DoD |
|---|---|---|---|---|
| LiFePO4 | 80 % | 800 Wh | 66.7 Ah | ~3,500 |
| AGM | 50 % | 500 Wh | 41.7 Ah | ~600 |
| Gel | 50 % | 500 Wh | 41.7 Ah | ~800 |
| Flooded lead-acid | 50 % | 500 Wh | 41.7 Ah | ~400 |
What that runs
Runtime from the usable LiFePO4 energy at 12V (80% depth of discharge), one load at a time, no inverter losses on the DC rows.
| Load | Power | Runtime |
|---|---|---|
| LED lighting | 15 W | 53.3 h |
| 12V compressor fridge (average) | 45 W | 17.8 h |
| Diesel heater (fan and glow plug average) | 30 W | 26.7 h |
| Water pump (while running) | 65 W | 12.3 h |
| Laptop plus router | 75 W | 10.7 h |
| Kettle through an inverter | 1200 W | 0.7 h |
What this size is in practice
1000Wh is 1kWh - the round number people plan with. At 12V that is 83Ah, which is why a "1kWh bank" in practice means one 100Ah module with a little headroom.
Building the same energy from standard modules
How many standard 100Ah 12V modules add up to this energy, and what capacity that becomes at each system voltage.
| System voltage | Capacity | Standard modules |
|---|---|---|
| 12 V | 83.3 Ah | 1 x 100Ah / 12V |
| 24 V | 41.7 Ah | 1 x 100Ah / 12V |
| 48 V | 20.8 Ah | 1 x 100Ah / 12V |
Other energy values (Wh)
Other capacities (Ah)
FAQ
How many Ah is 1000 Wh?
1000 Wh is 83.3 Ah at 12V, 41.7 Ah at 24V, and 20.8 Ah at 48V. Divide the watt-hours by the nominal battery voltage: Ah = Wh ÷ V.
How much of that 1,000 Wh can I use?
On LiFePO4 at 80% depth of discharge you get 800 Wh (66.7 Ah at 12V). On AGM or gel at 50% you get 500 Wh (41.7 Ah). Same nameplate, very different usable energy.
How long does that run a 12V fridge?
A compressor fridge averaging 45 W runs about 17.8 hours on the usable LiFePO4 energy at 12V. Cycling depends on ambient temperature, so treat this as the upper bound for a well-insulated unit.
What capacity is 1000 Wh on a real LiFePO4 module?
At the true LiFePO4 nominal voltage of 12.8V, 1000 Wh corresponds to 78.1 Ah. At a round 12V it is 83.3 Ah. Datasheets use 12.8V, most calculators use 12V.
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