Battery Capacity Calculator
Calculate battery capacity in Ah and Wh for optimal power storage
Battery Capacity Calculator
Compliant with IEC 61960 Battery Standards
Results:
Capacity (Ah): 0.00
Energy (Wh): 0.00
Energy (kWh): 0.00
How to Use the Calculator
From Power & Time
- Select "From Power & Time"
- Enter battery voltage
- Input power consumption in watts
- Specify required runtime in hours
- Set system efficiency percentage
From Current & Time
- Select "From Current & Time"
- Enter battery voltage
- Input current draw in amps
- Specify required runtime in hours
- Set system efficiency percentage
From Energy Storage
- Select "From Energy Storage"
- Enter battery voltage
- Input energy storage in Wh
- System efficiency is applied automatically
Battery Capacity Fundamentals
Amp-Hours (Ah)
Amp-hours measure the charge capacity:
- Current × Time = Capacity
- Higher Ah = Longer runtime
- Voltage independent measurement
Watt-Hours (Wh)
- Energy storage capacity
- Voltage × Ah = Wh
- Direct power consumption comparison
Key Formulas:
Capacity (Ah) = (Power × Time) / (Voltage × Efficiency)
Energy (Wh) = Voltage × Capacity (Ah)
Runtime = Capacity (Ah) / Current Draw (A)
Calculation Formulas
From Power:
Ah = (P × t) / (V × η)
From Current:
Ah = I × t / η
Energy Storage:
Wh = V × Ah
Example Calculation
12V Battery System:
Power: 100W
Runtime: 5 hours
Efficiency: 85%
Ah = (100W × 5h) / (12V × 0.85) = 49.02Ah
Wh = 12V × 49.02Ah = 588.24Wh
Capacity = 49.02Ah | Energy = 588.24Wh | kWh = 0.588kWh
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