Solar String Voltage Check Calculator

Panel voltage rises in the cold. Make sure it can't exceed your controller.

Use Voc and the Voc temperature coefficient from the panel datasheet, and your coldest likely morning. Everything is worked out in your browser. Nothing is saved or sent anywhere.

1. The panel

A negative number, from the datasheet.

2. Your string

3. Controller

4. Results

How it was worked out

    What this does and doesn't tell you

    • Leave a margin below the limit. Check the controller maker's own string sizing tool too.
    • Grid-connected systems must be designed by an accredited installer.
    • Safety: in Australia, any work on 240V AC wiring, including connecting an inverter, battery or solar system to a home's switchboard or fixed wiring, must be done by a licensed electrician.
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