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rv4jimnme's avatar
rv4jimnme
Explorer
Sep 13, 2015

Onan Micro Generator 2800 same as 30 amp shore power?

we just tried unplugging from power to run our generator for the one roof top A/c. The a/c runs but not as cold as when plugged in. The system is 30 amp and I thought it could handle that load. We understand the voltage may need checking and carburetor cleaned etc? but will it ever put out enough?to get as cold as the plug in power? I believe the formula computes to having enough to run the a/c? thanks for any help btw I cannot tell if a/c is 13,500 btu's or 15,000 does that make a difference as well?
  • The generator is supposed to put out
    2,800 watts
    120 volts
    23.3 amperes
    sorry not sure what a 30 amp plug in produces hubbie says 240 volts?
    my manual for a/c does not specify load for a/c however the Onan Booklet Table says "Typical Appliance Loads" and list a/c at 1400 up to 2,000 watts and refrig at 600 to 1000. so I guess you add converter and battery charger? (not sure) I tried turning frig to gas but this model seems will not do anything but electric as primary when it has power source. So I just shut off frig for a little while...still the a/c will not cool on genset like it does plugged in. just not too technical on this heh..even when we may not be exceeding load not cool enough for me...thanks for all the help
  • It should be adequate with the caveat; You probably cannot run a lot of other draw. For example are you also running your fridge, Hot Water and microwave at the same time? Battery charging and converter with eat up a little as well.
  • Hi,

    The generator is 2800 VA that is not the same as 30 amp-shore power.

    It should be adequate to run the roof air.

    What is the voltage when the generator is run?

    What is the voltage when the air conditioner is being run from the generator?

    What is the voltage on shore power?

    What is the voltage when the air conditioner is being run on shore power?
  • What is AC Voltage while on shore power?

    What is AC Voltage while on generator power?

    Shore to gen.......A/C should function same (if voltage is close)

    Voltage, carb/gen functioning, ambient air temp, etc.

    Same conditions.......A/C will cool same whether gen or shore
  • 30a * 120v = 3600w

    Voltage, not amperage, is the more common issue with problems with a/c.