Pack Design ValidatorValidateEstimate — not certification
Battery Building Tools Analyze & Validate

Battery Pack Design Validator

Validate your battery pack design before you build. Check for overcurrent risk, BMS mismatch, wire gauge issues, and thermal concerns.

Verdict

Don't build this yet — 2 things will fail

Your 14S4P pack has checks that will fail in the real world (wiring, weakest link). Fix those and the rest of the design passes.

Fix required2
Worth a look0
Passed5
Estimate — not certification

Weakest link at 40 A continuous

Each stage is rated against the current your load actually draws. The chain is only as strong as its lowest bar.
80 A
Cells4P × 20 A
60 A
BMScontinuous rating
30 A
Wire10 AWG
50 A
Fuserated trip

Your load asks for 40 A. Wire can't deliver that — it sets the ceiling for the whole pack.

Wire gauge insufficientFix requiredWiring
What's wrong

Wire gauge 10 AWG rated for ~30A, insufficient for 40A draw. Risk of wire overheating.

Why it matters

Undersized wire is a heater in series with your load — it drops voltage under load, and its insulation melts long before anything else fails.

How to fix it

Move to a thicker gauge with at least 40A of ampacity, or split the run into parallel conductors.

Size it in Wire Resistance →
Weakest link: Wire (10 AWG) (30A)Fix requiredWeakest Link
What's wrong

The Wire (10 AWG) is the limiting factor at 30A. This is below your required current draw.

Why it matters

Every amp flows through every stage, so the lowest-rated stage sets the whole pack's ceiling — and it's the component that fails first under load.

How to fix it

Upgrade the Wire (10 AWG) first — nothing else raises the ceiling until it moves.

Size it in Wire Resistance →
5 checks passed — show them
Current draw within safe limitsOvercurrent

Pack can deliver 80A, load requires 40A (50% utilization).

BMS properly matchedBMS

BMS rating (60A) is appropriate for the load (40A) and cell limits (80A).

Fuse properly ratedFuse

Fuse (50A) is appropriate for the load and cell limits.

Thermal risk acceptableThermal

Per-cell current (10.0A) is within comfortable thermal limits.

Pack voltage within safe rangeVoltage

Pack voltage (50.4V) is below the 60V safety threshold.

Checks are engineering estimates from your inputs and published datasheets. They are not a safety certification.