Solar Charge Controller Trace Width Calculator
20 A PV paths on a PCB — IPC-2221 with the NEC 1.56× design current and hot-enclosure derating built into the presets.
Preset for this niche — adjust to your stack-up. IPC-2221 assumes still air; verify hot paths with a thermal camera.
Solar Controller Trace Width Calculator computes PCB copper for PV charge-controller power paths under code current and desert heat — free, instant and private in your browser. Solar-electronics builders and reviewers of MPPT/PWM designs use it to skip the datasheet algebra: type your numbers, read the answer with the substituted formula shown step by step, and share an exact permalink of the calculation.
About Solar Charge Controller Trace Width Calculator
Solar Controller Trace Width Calculator computes PCB copper for PV charge-controller power paths under code current and desert heat using the standard engineering relation: IPC-2221 with PV presets: 20 A, 20 °C rise, 2 oz copper — plus the NEC 1.56× input factor. Worked live: 20 A continuous wants ~12 mm equivalent: production boards use mirrored pours, via stitching and tinned channels. The result recalculates on every keystroke, the worked-example panel shows your numbers substituted into the formula, and the Copy permalink button encodes the inputs in the URL so a colleague opens exactly your calculation. Everything runs client-side — nothing you type leaves your device.
How to use Solar Charge Controller Trace Width Calculator
- 1Enter your values — the tool starts with realistic defaults for this exact use case, so the worked example is meaningful immediately.
- 2Read the live result and the worked-example panel, which substitutes your numbers into the formula step by step.
- 3Adjust any input to compare scenarios, then use Copy result or Copy permalink to share the calculation.
Why use Solar Charge Controller Trace Width Calculator?
- ✓Implements the real formula — IPC-2221 with PV presets: 20 A, 20 °C rise, 2 oz copper — plus the NEC 1.56× input factor — with the substitution shown, not a black box
- ✓Built for solar-electronics builders and reviewers of MPPT/PWM designs
- ✓Copy result and permalink buttons — share the exact calculation in a README, forum answer or design review
- ✓100% free, no sign-up, runs entirely in your browser (works offline once loaded)
Frequently asked questions
How do you calculate solar controller trace width?+
PCB copper for PV charge-controller power paths under code current and desert heat follows IPC-2221 with PV presets: 20 A, 20 °C rise, 2 oz copper — plus the NEC 1.56× input factor. For example, 20 A continuous wants ~12 mm equivalent: production boards use mirrored pours, via stitching and tinned channels. The calculator applies the same relation and shows the substituted arithmetic so you can verify every step.
Which path deserves the most copper — panel, battery or load?+
Battery: it conducts around the clock (charging by day, supplying loads by night) while the PV side rests half of every day. It also sees fault currents from the battery's enormous short-circuit ability — fuse it closest to the battery and pour it widest.
How hot does a sealed controller enclosure really get?+
On a summer roof or wall, 50–60 °C internal ambient is routine before electronics add their rise. Allowing the usual 20 °C copper rise puts traces at 80 °C — fine for FR-4, brutal for nearby electrolytics. Quality designs use 105 °C-rated or polymer caps and derate hard.
Is the Solar Controller Trace Width Calculator free and private?+
Yes — completely free with no sign-up or usage limits, and it runs entirely in your browser: the values you enter are never uploaded or stored on a server.
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