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Battery Bank Voltage Calculator

Choose a battery bank voltage and work out the series and parallel arrangement.

About Battery Bank Voltage Calculator

Series connections add voltage while parallel strings add capacity. Higher bank voltage means lower current for the same power, which reduces cable size and losses substantially. A 48 V bank carries a quarter the current of a 12 V bank for the same power, which is why anything above about 1 kW uses 48 V.

Formula

Battery Bank Voltage

Series count = target voltage ÷ battery voltage; parallel strings = target Ah ÷ battery Ah

series
Adds voltage at constant capacity
parallel
Adds capacity at constant voltage

Worked example

With the default values below, Battery Bank Voltage Calculator returns Batteries in Series of 4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Target system voltageminimum 1 V
48 V
Voltage of each batteryminimum 1 V
12 V
Capacity of each batteryminimum 1 Ah
200 Ah
Target bank capacityminimum 1 Ah
600 Ah

Results

Batteries in Series
4
Strings in Parallel
3
Total Batteries Required
12
Bank Energy
28.800 kWh
Actual Bank Capacity
600.0 Ah

Step by step

  1. 1Values used
  2. 2Battery Bank Voltage
  3. 3Batteries in Series= 4
  4. 4Strings in Parallel= 3
  5. 5Total Batteries Required= 12
  6. 6Bank Energy= 28.800 kWh
  7. 7Actual Bank Capacity= 600.0 Ah

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Battery Bank Voltage calculated?

Series count = target voltage ÷ battery voltage; parallel strings = target Ah ÷ battery Ah Series connections add voltage while parallel strings add capacity. Higher bank voltage means lower current for the same power, which reduces cable size and losses substantially.

Why does Battery Bank Voltage matter?

A 48 V bank carries a quarter the current of a 12 V bank for the same power, which is why anything above about 1 kW uses 48 V.

What values do I need to enter?

This calculator takes 4 inputs: Target system voltage, Voltage of each battery, Capacity of each battery, Target bank capacity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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