Battery Presets
Energy (kWh)
1.2
100 Ah × 12V ÷ 1000
Formula: kWh = Ah × Voltage ÷ 1000
Understanding Ah vs kWh
Amp Hours (Ah) measures a battery's charge capacity - how much current it can deliver over time. Kilowatt Hours (kWh) measures total energy storage, which is more useful for comparing batteries at different voltages.
Why Voltage Matters
A 100Ah 12V battery and a 50Ah 24V battery both store the same energy (1.2 kWh), but they're suited for different applications:
- 12V systems - RVs, boats, small off-grid setups
- 24V systems - Larger RVs, medium solar systems
- 48V systems - Home battery backup, large solar installations
Depth of Discharge (DoD)
Not all battery capacity is usable. DoD tells you how much you can safely use:
- Lead-acid batteries - 50% DoD recommended (using more reduces lifespan)
- LiFePO4 batteries - 80-90% DoD safely usable (longer lifespan at any DoD)
Related Calculators
