About the Battery Bank Calculator
Series and parallel layout to build a battery bank of a target voltage and capacity.
Also known as: battery bank design, series parallel battery, battery array calculator, inverter-battery.
How to use this calculator
- Enter target bank voltage, target energy, voltage per battery, capacity per battery and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
series = target V ÷ battery V · strings = target kWh ÷ string kWh
Worked example
Using the values pre-filled in the calculator above:
- Target bank voltage = 48 V
- Target energy = 10 kWh
- Voltage per battery = 12 V
- Capacity per battery = 100 Ah
- Price per battery = 220
the calculator returns:
- Bank layout: 4 in series × 3 parallel strings
- Total batteries: 12
- Bank voltage: 48 V
- Bank capacity: 300 Ah