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Open Roads Forum  >  Class A Motorhomes  >  General Topics

 > Ac on generator problem.

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gssfc

NH

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Posted: 08/10/21 11:09am Link  |  Quote  |  Print  |  Notify Moderator

We have a 2014 Georgetown 351ds with dual 15k ac units and a 5500kw generator. When on shore power both ac units operate fine cycle as they are designed and blow cold air. When on generator if both units are running they will run for a short period of time (10-15 min) and then suddenly shut off as if they lost power but the generator does not seem affected…it doesn’t bog down or trip a breaker. Solution is to shut off the ac at the thermostat and then restart and it works fine for a 10-15 min then both shut off again. If we run only one ac unit there is no problem. Will run for days without issue but neither is sufficient to cool the motorhome down.

Kind of lost as to what’s happening.

enblethen

Moses Lake, WA

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Posted: 08/10/21 12:10pm Link  |  Quote  |  Print  |  Notify Moderator

I would start by checking the voltage output of the genset. Check with no load and then with both ACs running. I think you may find that the genset set is not putting out enough voltage. It may need a throttle adjustment.
What is exact make and model of genset.


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crawford

Dandridge Tenn.

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Posted: 08/10/21 01:35pm Link  |  Quote  |  Print  |  Notify Moderator

check genny see if both circuit breaker haven't pop reset them both and try them again yours should have 2 on it.


Change from a c class to a A class Georgetown 07 triple slide

bgum

South Louisiana

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Posted: 08/10/21 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

Enablethen is correct. I think you will find that the need exceeds supply. You may be able to turn off some things or run some things on gas which could solve your problem.

jdc1

Rescue, Ca

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Posted: 08/10/21 04:06pm Link  |  Quote  |  Print  |  Notify Moderator

bgum wrote:

Enablethen is correct. I think you will find that the need exceeds supply. You may be able to turn off some things or run some things on gas which could solve your problem.


Exactly. Fridge(5-8amps), Converter (3-5amps), AC (12-16 amps each, and anything else you have going on.....

enblethen

Moses Lake, WA

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Posted: 08/10/21 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

I refered to low voltage not insufficient amperage(wattage). Low voltage would increase the amerage.

crawford

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Posted: 08/10/21 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 5500 genny and can run both 15000 btu ac units my electric rod hot water tank plus both TV's you name it it shouldn't be a problem with that generator.

enblethen

Moses Lake, WA

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Posted: 08/10/21 07:04pm Link  |  Quote  |  Print  |  Notify Moderator

OP says he has a 5500 genset. If it is a Onan it will produce a little over 45 amps.
It should run everything with no issues if it is running right. It should be running at 2400 RPMs. Lower RPMs will lower voltage and effect the frequency.
Use a digital volt meter to adjust engine speed to produce about 125 volts under no load.

theoldwizard1

SE MI

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Posted: 08/10/21 08:30pm Link  |  Quote  |  Print  |  Notify Moderator

The A/C are likely shutting down to overheating. Overheating likely caused by low voltage.

The only way to prove it is a good meter directly connected to the wires at each A/C unit.

gssfc

NH

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Posted: 08/11/21 02:15pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the replies. It’s in Chicago with my girl and I’m in NH. So I can’t test voltage until she returns next week. But I believe you’ve all sent me down the right road. Had to do same thing with generator in my spray foam trailer years ago, unfortunately I forgot about that until now. D’oh!

Thanks for the advice. Tim

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