Battery Pack Series Parallel Configuration Calculator
The basic arithmetic of a battery pack drives nearly every early EV supplier conversation: how many cells, what voltage, how many kilowatt hours. This calculator handles the series and parallel math in one place and adds mass and power so you can check a layout quickly.
Your numbers
About 3.6 to 3.7 V for NMC, 3.2 V for LFP.
Your results
Cell level math only. Pack mass, thermal limits, balancing, usable window and aging are not included.
Pack energy (kWh) vs cells in parallel
Sweeps Cells in parallel from 1 to 12, holding your other inputs fixed.
Pack BOM and traceability in your ERP
Optional: discuss linking cell lots and pack configurations in your ERP.
Optional. The tool and every export work without this. No spam.
How to use it
Set the number of cells in series (S) and in parallel (P), then enter the cell's capacity, voltages and mass from its datasheet. The outputs give pack voltage window, capacity, nominal energy and cell mass. Use the C rate input for a quick continuous power check, taken from the cell's rated continuous discharge.
- Series adds voltage, parallel adds capacity
- Use the cell datasheet nominal, not an average of max and min
- Check the inverter's voltage window against pack min and max
Formulas
Pack nominal voltage equals series count times cell nominal voltage. Pack capacity equals parallel count times cell Ah. Energy in kWh equals nominal voltage times Ah divided by 1000. Continuous power equals nominal voltage times capacity times C rate over 1000. Cell count is simply S times P, and cell mass is the count times cell mass.
Reading the result
A 96S3P layout of 5 Ah cells gives roughly 350 volts nominal and about 5.3 kWh, which fits a small hybrid or a module in a larger pack. Compare pack minimum and maximum voltage with the power electronics window. If the window does not fit, change the series count rather than the parallel count.
Common mistakes
Do not quote pack energy without stating nominal or usable. Usable energy depends on the state of charge window and aging margin. Remember that busbars, cooling plates, housing and the battery management system add substantial mass beyond the cells, so cell level energy density is always higher than pack level density.
Frequently Asked Questions
What does 96S3P mean?
It means 96 cells in series, with 3 cells in parallel at each series position. Total cells are 96 times 3, which is 288. Voltage scales with the 96, capacity with the 3.
Is nominal voltage the same for every chemistry?
No. Typical nominal values are about 3.6 to 3.7 V for NMC and NCA and about 3.2 V for LFP. Always use the datasheet value for the exact cell.
How do I get usable energy?
Multiply nominal energy by the usable state of charge window. Many programs reserve some capacity at the top and bottom, and further margin for aging. Confirm with your battery management specification.
Does this check cell balancing?
No. Balancing, thermal behavior and safety design require separate analysis and testing. Treat this as sizing arithmetic only.
If you build packs or modules, Netray can help connect bills of materials, cell lot traceability and test records in your ERP so every pack configuration is tied to its parts.
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