1280Wh to Ah — 106.7 Ah at 12V
1280 Wh is 106.7 Ah at 12V, 53.3 Ah at 24V, and 26.7 Ah at 48V. Below: usable energy per chemistry, what it runs, and which module count gets you there.
1280 Wh at 12V is 106.7 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 | 106.7 Ah | 1,280 Wh | 1.28 |
| 24 V | 53.3 Ah | 1,280 Wh | 1.28 |
| 48 V | 26.7 Ah | 1,280 Wh | 1.28 |
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 % | 1,024 Wh | 85.3 Ah | ~3,500 |
| AGM | 50 % | 640 Wh | 53.3 Ah | ~600 |
| Gel | 50 % | 640 Wh | 53.3 Ah | ~800 |
| Flooded lead-acid | 50 % | 640 Wh | 53.3 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 | 68.3 h |
| 12V compressor fridge (average) | 45 W | 22.8 h |
| Diesel heater (fan and glow plug average) | 30 W | 34.1 h |
| Water pump (while running) | 65 W | 15.8 h |
| Laptop plus router | 75 W | 13.7 h |
| Kettle through an inverter | 1200 W | 0.9 h |
What this size is in practice
1280Wh is the most common real nameplate in the 12V world: 12.8V x 100Ah LiFePO4. If a datasheet says 1280Wh and a calculator says 1200Wh, both are right - they use a different nominal voltage for the same battery.
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 | 106.7 Ah | 1 x 100Ah / 12V |
| 24 V | 53.3 Ah | 1 x 100Ah / 12V |
| 48 V | 26.7 Ah | 1 x 100Ah / 12V |
Other energy values (Wh)
Other capacities (Ah)
FAQ
How many Ah is 1280 Wh?
1280 Wh is 106.7 Ah at 12V, 53.3 Ah at 24V, and 26.7 Ah at 48V. Divide the watt-hours by the nominal battery voltage: Ah = Wh ÷ V.
How much of that 1,280 Wh can I use?
On LiFePO4 at 80% depth of discharge you get 1,024 Wh (85.3 Ah at 12V). On AGM or gel at 50% you get 640 Wh (53.3 Ah). Same nameplate, very different usable energy.
How long does that run a 12V fridge?
A compressor fridge averaging 45 W runs about 22.8 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 1280 Wh on a real LiFePO4 module?
At the true LiFePO4 nominal voltage of 12.8V, 1280 Wh corresponds to 100 Ah. At a round 12V it is 106.7 Ah. Datasheets use 12.8V, most calculators use 12V.
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