Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Wire length run

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  • February 23, 2021 at 1:03 pm #110659

    Will
    Participant

    6.7 QSB series 31 battery Question…will a 20′ run of 4/0 wire to starter be ok ?

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  • February 24, 2021 at 9:56 am #110726

    bluebyu
    Participant
    Location: East Coast
    Country: USA

    Blue Sea Systems has a nice wire size calculator:
    http://circuitwizard.bluesea.com/#

    40 feet is pushing the limits.
    the calculator shows 445 amps max at 10% drop.

    My 6CTA8.3 draws around 500amps at start. (plus 190 amps for the grid heater, which may be on a separate conductor)

    most likely it would work, but closer is much better.

    Hope this helps

    February 24, 2021 at 8:12 am #110719

    Will
    Participant

    20 ‘

    February 24, 2021 at 6:19 am #110715

    bluebyu
    Participant
    Location: East Coast
    Country: USA

    How far is the negative run to the battery?

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