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captdaveo's avatar
captdaveo
Explorer
Jul 20, 2024

Running A/C over draws the batteries causing inverter alarm

I'm trying to run a rooftop A/C unit that draws 10.5 amps at 120V = 1260 watts. I have a 2000 watt inverter connected to a 430 amp hour battery bank using 18' of 2/0 stranded cable. This should be ...
time2rollagain's avatar
time2rollagain
Explorer II
Jul 22, 2024

18' of 2/0 is still a bit far to feed 150 amps to an inverter.  Have you checked the inverter input vs voltage at the battery terminals?

captdaveo's avatar
captdaveo
Explorer
Jul 22, 2024

I have, no voltage drop from the cables.

  • valhalla360's avatar
    valhalla360
    Navigator
    Jul 24, 2024

    Is that measured while running? Voltage drop is a function of amperage. If the inverter is just in idle mode waiting, there will be negligible amperage draw, so there will be negligible voltage drop. Suddenly ramp that up to 150amps and there almost certainly will be voltage drop. The question is if it's an acceptable amount of drop.

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