Layout choices change volts and amp-hours but energy in Wh is what you size loads against. This series-parallel battery layout calculator (Wh) reads your series count, parallel strings, and cell specs into total pack watt-hours plus an nSnP label.
Benefits
- Wh = (S × cell V) × (P × cell Ah) from your layout inputs.
- Compare alternative S/P splits at the same cell count.
- Outputs configuration tag for BMS and wiring diagrams.
How it works
- Sketch cells in series per string and strings in parallel.
- Enter S, P, nominal cell V, and cell Ah in the tool.
- Read pack Wh alongside V and Ah—use Wh for runtime and solar yield.
FAQ
What does a series-parallel battery layout calculator (Wh) show?
It converts your physical layout into pack watt-hours: Wh = pack V × pack Ah, where V = S × cell V and Ah = P × cell Ah. Example: 16S1P vs 8S2P with the same 32 cells—both can yield similar Wh but different bus voltage and amp-hour split.
Can I compare layouts with the same number of cells?
Yes—total cell count is S × P. Rearranging series and parallel changes V and Ah but Wh stays constant when cell chemistry and capacity match. Pick the layout that fits your inverter DC range and cable current, then confirm Wh meets load energy.
Why plan in Wh instead of amp-hours alone?
Amp-hours without voltage mis-rank packs—a 100 Ah 12 V bank (1,200 Wh) differs from 100 Ah at 48 V (4,800 Wh). Wh is the layout-independent energy figure for runtime, solar storage, and comparing module SKUs.
Technical specifications
- Pack Wh = (S × cell_V) × (P × cell_Ah).
- Cell count = S × P.
- Wh constant for fixed cell count when chemistry matches.
- Configuration label: {S}S{P}P.
- Related: battery-series-parallel, battery-energy, ah-to-wh.
Layout is volts × amp-hours, energy is Wh
A series-parallel battery layout calculator (Wh) starts from how cells are wired, not from a finished module sticker. Series depth sets bus voltage; parallel width sets amp-hours; multiplying both yields watt-hours. Document Wh on the layout sketch so runtime and inverter sizing use one number everyone agrees on.
Same cells, different S/P, same Wh
Thirty-two 3.2 V 100 Ah cells are 10,240 Wh whether wired 16S2P or 8S4P—but bus voltage and per-string current differ. Higher series counts favor high-voltage inverters; more parallel strings spread amp draw. Use Wh to confirm energy is preserved, then pick the layout that matches equipment limits.
From Wh on paper to Wh in service
Calculated Wh assumes matched cells and nominal voltage—field banks lose margin to BMS reserve, temperature, and age. After layout Wh is set, derate for depth-of-discharge and round-trip efficiency when chaining to Battery Runtime or solar yield tools. Re-run the calculator when you add strings or change series depth.