Battery Building Tools Plan & Size

BMS Planner for Battery Packs

Choose the right BMS for your custom battery pack based on series count, current demand, and pack capability.

Target BMS14S 40A
Nominal voltage50.40 V
Pack output60.00 A
Load demand38.27 A
1Pack information

Pack Information

Fill out the planned pack specs to calculate the required BMS rating.

Quick presets

If you are still in the planning stage, use the pack planner to work out the broader pack configuration first.

If you need build-process guidance too, read the battery pack build guide.

Nominal, minimum, and maximum cell voltage should come from the datasheet. Capacity and C-rate tell the planner whether the cells can actually support the requested load.

2Decision checks

Voltage window

39.20V to 58.80V

Current headroom

21.73A of headroom at the current assumptions.

Catalog match

3 close-fit product matches found.

3Results & products

Results

For this build, you should target a 14S 40A BMS.

Nominal Pack Voltage50.40 V
Minimum Pack Voltage39.20 V
Maximum Pack Voltage58.80 V
Pack Max Output60.00 A
BMS Needs To Handle38.27 A
Recommended Class40 A

Matching BMS Products

These are sorted by amperage so the earliest match is the closest fit. Higher-amp options give you extra headroom if your pack can support it.