Battery Series-Parallel Pack Sizing Calculator
For battery systems engineers designing high-capacity utility-scale BESS arrays who need to instantly validate their proposed series-parallel topology against target pack voltages and energy capacities before component procurement.
Determines total pack voltage and amp-hour capacity using standard combinations V_pack = V_cell * N_s and C_pack = C_cell * N_p.
BESS Pack Sizing Tool
V_pack = V_cell * N_s, C_pack = C_cell * N_p, E_kWh = (V_pack * C_pack) / 1000
How to Use This Tool
- Enter the nominal voltage and Amp-hour rating of your base electrochemical cell.
- Specify the number of modules stacked in series (Ns) to meet your DC bus voltage requirement.
- Input the number of parallel strings (Np) required to reach your desired storage duration.
- Read the resulting live Pack Voltage, Total Capacity, and Net kWh energy immediately.
FAQ
Q: How do I calculate total pack voltage using series strings?
A: Multiply the single-cell voltage by the number of cells in series (Ns) using the standard formula V_pack = V_cell * N_s to ensure the busbar rating isn't exceeded.
Q: What happens if I set the series cells to zero?
A: The calculator enforces a minimum positive integer for the series field, as you cannot establish a viable electrical potential difference without at least one cell in the chain.
Q: How is the total pack kWh capacity derived?
A: It computes E_kWh = (V_pack * C_pack) / 1000, which turns volt-ampere-hours (Wh) into kilowatt-hours; divide by 1,000 again for MWh.
Q: Once I size my pack, how do I check the thermal dissipation?
A: With the total amperage established via your Np value, use the Battery Internal Resistance & Voltage Drop Calculator for the voltage sag and the Battery Thermal Heat Dissipation Calculator for the I²R heat.