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Old 05-28-2013, 05:44 PM   #1
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A/C runs fine plugged in, trips generator?

Our 2010 21DFWP toy hauler has a 13,500 Dometic A/C unit. It runs fine when plugged into an outlet, but when hooked up to a 3500 watt generator, it overloads the generator. Is there any maintenance I can do besides clean the filters and blowing out the coils? Any idea what would be wrong?

Thanks!
JM
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Old 05-28-2013, 05:57 PM   #2
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What else are you running with the AC 3500 watts in my opinion is marginal at best running the AC with any other appliances..... Some will probably disagree........
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Old 05-28-2013, 06:03 PM   #3
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Converter may be drawing up to 8 amps.
If water heater is on electric its pulling 9- 13amps.
Fridge is pulling 5-8 amps on electric.
13.5 a/c draws 12-16 amps running and many more to start up.

Not to hard to do the math here.

normal appliance amp draws

3500 watt gennie is at best 29 amps.
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Old 05-28-2013, 06:13 PM   #4
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Just out of curiosity is the outlet on the gennie a 120/240 volt outlet?
Is it 4 prong?


Turbs
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Old 05-28-2013, 07:47 PM   #5
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Thanks for the replies. I'm not running anything else, not even a light, just troubleshooting the A/C and it still trips. Using a three prong, 30 amp outlet from generator. Have been reading about the hard start mods to the A/C and wondering if that wouldn't resolve my problems.
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Old 05-28-2013, 08:07 PM   #6
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Quote:
Originally Posted by jmatteson View Post
Thanks for the replies. I'm not running anything else, not even a light, just troubleshooting the A/C and it still trips. Using a three prong, 30 amp outlet from generator. Have been reading about the hard start mods to the A/C and wondering if that wouldn't resolve my problems.
The fan delay mod I came up with may help you tremendously.
Hard start capacitor may help to.

Btw is 3500 watts surge watts or running watts?
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Old 05-29-2013, 01:22 AM   #7
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For my Honda 3000 watt gen to run my A/C,I have to turn off the economy mode,set the A/C fan on manual low and of course the thermostat set to cool.If you let the fan cycle with the A/C compressor it draws too much on the start up spike.With the fan set on manual low there is less of a spike for the generator to over come.(my Honda is an EU3000IS)I also use the 23.3 amp outlet with an adapter to the 30 amp rv plug.
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Old 05-29-2013, 07:22 AM   #8
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My Champion 3500 runs my A/C, refrigerator, converter all at the same time. We just do not run the micro wave with the A/C on and powered off the Generator.
I'd start my troubleshooting your problem by picking up a handheld clamp on amp meter.
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