Battery Bank Wattage Calculator
Calculate total and usable watt-hours for your battery system
Battery Bank Wattage Calculator
For Solar, RV, and Off-Grid Systems
Results:
Total Watt-hours (Wh): 0.00
Usable Watt-hours (Wh): 0.00
How to Use the Battery Bank Wattage Calculator
Basic Calculation
- Enter Battery Voltage (V)
- Enter Battery Capacity (Ah)
- Default DoD and Inverter Efficiency will be used
With Depth of Discharge
- Enter Voltage and Capacity
- Adjust Depth of Discharge (DoD %)
- This impacts usable capacity
With Inverter Efficiency
- Enter Voltage, Capacity, and DoD
- Adjust Inverter Efficiency (%)
- Accounts for energy loss during conversion
Battery Bank Fundamentals
Battery Capacity & Voltage
Battery capacity (Ah) and voltage (V) determine the total energy stored. Watt-hours (Wh) is the standard unit for energy.
Depth of Discharge & Efficiency
- Depth of Discharge (DoD): The percentage of battery capacity that has been discharged. Exceeding recommended DoD can shorten battery life.
- Inverter Efficiency: The efficiency of converting DC battery power to AC power for appliances. Energy is lost during this conversion.
Key Formulas:
Total Watt-hours (Wh) = Battery Voltage (V) × Battery Capacity (Ah)
Usable Watt-hours (Wh) = Total Watt-hours (Wh) × (DoD / 100) × (Inverter Efficiency / 100)
Calculation Formulas
Total Watt-hours (Wh):
Wh_total = V × Ah
Usable Watt-hours (Wh):
Wh_usable = Wh_total × (DoD / 100) × (Efficiency / 100)
Example Calculation
For a 12V, 100Ah battery with 80% DoD and 90% Inverter Efficiency:
Battery Voltage: 12V
Battery Capacity: 100Ah
DoD: 80%
Inverter Efficiency: 90%
Total Wh = 12V × 100Ah = 1200 Wh
Usable Wh = 1200 Wh × (80 / 100) × (90 / 100) = 864 Wh
Total Wh = 1200.00 Wh | Usable Wh = 864.00 Wh