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Cable size formula for solar panel wiring

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  • chrisski
    replied
    When laying the wire, I’d recommend you making it thicker than you need to account for growing, On top of thicker wire, if you put it in conduit, make it big enough to fit more wire.

    I go to here and figure about wire with less than 3% losss:

    https://www.calculator.net/voltage-drop-calculator.html

    I also check the amps running through the wire and make sure its good for less than 60 Degrees C insulation:

    https://www.wireandcabletips.com/what-is-ampacity/

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  • Mike90250
    replied
    Looks like you could have just 30 A from the 3 panels in parallel. That would require at least 10ga wire, adding that distance, I'd opt for 8ga. Harder to wrangle and pull, but it would give the least loss. With more than 2 panels, you need a Combiner Box or some other way for panel protection if a panel becomes damages so it does not start a fire.
    Last edited by Mike90250; 07-13-2021, 07:23 PM. Reason: grammar correction

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  • Edelem
    started a topic Cable size formula for solar panel wiring

    Cable size formula for solar panel wiring

    Hello, so i plan to install 3 of this 310w panels in parallel (watch picture) on my boat and im not sure about the wiring size. Cable lenght from the panels to controller will be around 30ft.
    reason for parallel wiring is shading. Controller is a midnight solar 150.
    What formula is existing to get as less voltage drop as possible?
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