Conductor Sizing

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solarj
solarj Registered Users Posts: 6 ✭
in PV Installers Forum - NEC, Wiring, Installation #1
How to figure conductor size? 3 panels in series 5 parallel Isc 9.71 amps going 40 feet to charge controller.

9.71x5=48.55x1.25=60.68x1.25=75.8 looks like #2 awg
Does this sound right?
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  • Ethan Brush
    Ethan Brush Solar Expert Posts: 235 ✭✭
    #2
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    solarj wrote: »
    How to figure conductor size? 3 panels in series 5 parallel Isc 9.71 amps going 40 feet to charge controller.

    9.71x5=48.55x1.25=60.68x1.25=75.8 looks like #2 awg
    Does this sound right?

    I agree with your 75.8 amp number, assuming no adjustments for CCC or temp. However your wire size is unnecessarily large. #4 copper easily does it.
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  • oil pan 4
    oil pan 4 Solar Expert Posts: 767 ✭✭✭✭
    #3
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    Copper or Aluminum?

    Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

    Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

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