Productive ToolboxBattery Capacity Calculator
Calculate required battery capacity in Ah and Wh for backup power, solar systems, and electronics. Free online calculator with efficiency adjustment and battery type support.
Battery Capacity Calculator
Calculate required battery capacity in Ah and Wh for backup power, solar systems, inverters, and electronics with efficiency adjustment.
Actions
System Parameters
Common Applications
About Battery Capacity Calculator
The Battery Capacity Calculator helps you determine the required battery size in Ampere-hours (Ah) and Watt-hours (Wh) for backup power systems, solar installations, inverters, and electronics. This free online tool accounts for system efficiency and battery type to provide accurate capacity estimates.
Battery Capacity Formula
Where Power is in Watts, Time in hours, Voltage in Volts, and Efficiency as a decimal (0.8 = 80%).
Common Use Cases
- ✓ Solar Power Systems: Size battery banks for off-grid solar installations
- ✓ Backup Power: Calculate UPS and inverter battery requirements
- ✓ RV & Marine: Determine battery capacity for recreational vehicles and boats
- ✓ Emergency Systems: Size batteries for emergency lighting and equipment
- ✓ DIY Electronics: Calculate battery needs for portable projects
Battery Type Considerations
Lead Acid (80% efficiency): Most affordable, heavy, requires maintenance, 50% depth of discharge recommended.
Lithium-ion (90% efficiency): Lighter, longer lifespan, 80% depth of discharge, higher cost.
LiFePO4 (95% efficiency): Best efficiency, safest lithium chemistry, longest lifespan, 90% depth of discharge.
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