Don’t Melt
The Wires

A DC cable size calculator for 12V, 24V and 48V setups. It now has live volt and amp gauges, chart-style cable icons, AWG/B&S and mm² output, and an AI helper that stays locked out of the maths.

1. Circuit details

System voltage Load type Load current, amps Continuous load current. One-way cable distance, metres Battery to appliance distance only. The calculator doubles this for positive + negative. Safety headroom

2. Circuit importance

Live meters

Volt meter0–48V

—system voltage

Amp meter0–200A

—design current with headroom

Voltage drop

—

Cable run

—

Load stress

—

Recommendation

Recommended minimum — Enter your circuit details.

Calculated load—

Total cable length—

Voltage drop—

Drop percentage—

Common cable sizes

Icon	AWG	mm²	Dia.	Drop	Status

Compliance Assist — not certification

Hardware-aware design checks

Selected cable product Used for rough current-capacity and insulation notes. Fuse / breaker type Fuse rating should protect the cable and suit the DC system voltage. Fuse / breaker rating, amps This is checked against the selected cable and load. Connector Flags obvious connector current mismatches. Installation environment Protection near source

Overall—

Pass0

Warnings0

Fails0

Regression tests

AI guardrails on: AI explains only — calculator stays boss

3. Optional Groq AI helper

Groq API key Stored only in this browser if you choose Save. Do not hard-code your key into a public GitHub Pages file. Model

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