Our intuitive Battery Capacity Calculator helps you determine the Amp-hours (Ah) or Watt-hours (Wh) needed for your electrical projects. Easily calculate battery requirements based on voltage, current draw, and desired runtime. Perfect for off-grid systems, RVs, marine applications, and DIY electronics.
Formula:
The core relationships for battery capacity, power, and runtime are derived from basic electrical formulas:
- Power (P) = Voltage (V) × Current (I)
- Amp-hours (Ah) = Current (I) × Time (T)
- Watt-hours (Wh) = Power (P) × Time (T) or Voltage (V) × Amp-hours (Ah)
Where:
- P = Power in Watts (W)
- V = Voltage in Volts (V)
- I = Current in Amperes (A)
- T = Time in Hours (h)
- Ah = Amp-hours
- Wh = Watt-hours