314Ah to Wh — 3,768 Wh at 12V
314Ah stores 3,768 Wh at 12V, 7,536 Wh at 24V, and 15,072 Wh at 48V. Below: usable energy per chemistry, what it runs, and how the same energy is built from standard modules.
314Ah at 12V is 3,768 Wh — that is 3.77 kWh of nameplate energy.
Formula: Wh = Ah × V. The voltage is the nominal battery voltage, not the charging voltage.
A real LiFePO4 module of 314Ah is usually labelled 4,019 Wh, because its nominal voltage is 12.8V rather than a round 12V. Both 3,768 Wh and 4,019 Wh describe the same battery.
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 | 314 Ah | 3,768 Wh | 3.77 |
| 24 V | 314 Ah | 7,536 Wh | 7.54 |
| 48 V | 314 Ah | 15,072 Wh | 15.07 |
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 % | 3,014 Wh | 251.2 Ah | ~3,500 |
| AGM | 50 % | 1,884 Wh | 157 Ah | ~600 |
| Gel | 50 % | 1,884 Wh | 157 Ah | ~800 |
| Flooded lead-acid | 50 % | 1,884 Wh | 157 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 | 200.9 h |
| 12V compressor fridge (average) | 45 W | 67 h |
| Diesel heater (fan and glow plug average) | 30 W | 100.5 h |
| Water pump (while running) | 65 W | 46.4 h |
| Laptop plus router | 75 W | 40.2 h |
| Kettle through an inverter | 1200 W | 2.5 h |
What this size is in practice
314Ah is the prismatic cell generation that replaced the 280Ah cell in new DIY builds - same case family, same 3.2V nominal, about 12 percent more energy per cell. Anyone comparing a quote for a 280Ah bank against a 314Ah bank is comparing cell generations, not brands.
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 | 314 Ah | 3 x 100Ah / 12V |
| 24 V | 157 Ah | 3 x 100Ah / 12V |
| 48 V | 78.5 Ah | 3 x 100Ah / 12V |
Other capacities (Ah)
Other energy values (Wh)
FAQ
How many Wh is 314Ah?
314Ah is 3,768 Wh at 12V, 7,536 Wh at 24V, and 15,072 Wh at 48V. Multiply the amp-hours by the nominal battery voltage: Wh = Ah × V.
How much of that 3,768 Wh can I use?
On LiFePO4 at 80% depth of discharge you get 3,014 Wh (251.2 Ah at 12V). On AGM or gel at 50% you get 1,884 Wh (157 Ah). Same nameplate, very different usable energy.
How long does that run a 12V fridge?
A compressor fridge averaging 45 W runs about 67 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.
Why does the datasheet say 4,019 Wh instead of 3,768 Wh?
Because LiFePO4 has a nominal voltage of 12.8V per 12V module, not exactly 12V. 314Ah × 12.8V = 4,019 Wh. The 12V figure of 3,768 Wh is the conservative system-voltage calculation. Both describe the same battery.
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