960Wh to Ah — 80 Ah at 12V
960 Wh is 80 Ah at 12V, 40 Ah at 24V, and 20 Ah at 48V. Below: usable energy per chemistry, what it runs, and which module count gets you there.
960 Wh at 12V is 80 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 | 80 Ah | 960 Wh | 0.96 |
| 24 V | 40 Ah | 960 Wh | 0.96 |
| 48 V | 20 Ah | 960 Wh | 0.96 |
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 % | 768 Wh | 64 Ah | ~3,500 |
| AGM | 50 % | 480 Wh | 40 Ah | ~600 |
| Gel | 50 % | 480 Wh | 40 Ah | ~800 |
| Flooded lead-acid | 50 % | 480 Wh | 40 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 | 51.2 h |
| 12V compressor fridge (average) | 45 W | 17.1 h |
| Diesel heater (fan and glow plug average) | 30 W | 25.6 h |
| Water pump (while running) | 65 W | 11.8 h |
| Laptop plus router | 75 W | 10.2 h |
| Kettle through an inverter | 1200 W | 0.6 h |
What this size is in practice
960Wh is exactly 12.8V x 75Ah - the nameplate energy of a 75Ah LiFePO4 module. Anyone converting an old 75Ah AGM to lithium meets this figure on the datasheet.
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 | 80 Ah | 1 x 100Ah / 12V |
| 24 V | 40 Ah | 1 x 100Ah / 12V |
| 48 V | 20 Ah | 1 x 100Ah / 12V |
Other energy values (Wh)
Other capacities (Ah)
FAQ
How many Ah is 960 Wh?
960 Wh is 80 Ah at 12V, 40 Ah at 24V, and 20 Ah at 48V. Divide the watt-hours by the nominal battery voltage: Ah = Wh ÷ V.
How much of that 960 Wh can I use?
On LiFePO4 at 80% depth of discharge you get 768 Wh (64 Ah at 12V). On AGM or gel at 50% you get 480 Wh (40 Ah). Same nameplate, very different usable energy.
How long does that run a 12V fridge?
A compressor fridge averaging 45 W runs about 17.1 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 960 Wh on a real LiFePO4 module?
At the true LiFePO4 nominal voltage of 12.8V, 960 Wh corresponds to 75 Ah. At a round 12V it is 80 Ah. Datasheets use 12.8V, most calculators use 12V.
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