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Old 07-07-2016, 10:54 AM   #1
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Dometic AC on Generator

Good Afternoon Everyone,

I came into a problem the last time I used my AC on the generator. The generator runs fine when the AC is off. That includes me using the microwave over. Moments after I turn the AC on, the generator stalls and turns off. I get a warning light that says that there is not enough power to run the AC. I don't have anything else running in the RV so I don't know how that would happen.

Any ideas?
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Old 07-07-2016, 11:02 AM   #2
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Dometic AC on Generator

What size generator?

2500 watts is the very minimum 3000 + would be better.

What are you plugging into on your generator?

Your converter is always running, 2-8 amps


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Old 07-07-2016, 11:05 AM   #3
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Need more information, What is the unit? Is this an external generator or a built in? There are most likely other things running, converter, etc. What size / manufacturer generator?
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Old 07-07-2016, 11:05 AM   #4
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Its best when stating a problem that you give some background ie: Type of rig, size of generator.

What it actually sounds to me is your AC is pulling more amps on startup then your generator can handle. Some folks myself included have added a hard start kit to the AC to assist in faster start with less amp pull so that the generator can handle the startup.
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Old 07-07-2016, 11:06 AM   #5
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You guys are to fast for me there were no reply when I started typing my response
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Old 07-07-2016, 11:15 AM   #6
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Sorry guys. I have a 2013 Sunseeker 3170 DS. I have a built in Onan RV 4000.
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Old 07-07-2016, 11:23 AM   #7
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There have been a few reports lately of those gennys having problems running the A/C. I'm not sure what the outcome is, but do a little searching for the same problem and you may get some help with things to try.
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Old 07-07-2016, 12:18 PM   #8
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I have a 2013 Sunseeker 2300. I have experienced problem with cold generator handling dometic frig, inverter and A/C when it cuts on, particularly at elevations above 5000 feet. Generally after it runs for a few minutes, handles load okay. BIGGEST problem with MH generators is running them enough that the carb don't clog up. Mine is running good now, but went through 3 days of boondocking with 24/7 running A/Cs, microwaves, coffee pots, etc - not all at the same time. Think that cleaned up the carb.

MH genny has worst of all worlds - ethanol in gasoline and usually low usage. Keep in mind that unit from factory may sit on lot for several months and you may have a problem before it's driven out of the lot.
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Old 07-07-2016, 12:36 PM   #9
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Same problem

I have had the same problem and a guy who repairs small engines says it's not big enough to run the air. Your post could have been wrote by me it's so similar.
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Old 07-07-2016, 12:44 PM   #10
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Depends...

A 4000 watt generator should be able to handle a 15K BTU air conditioner. My 3200 watt diesel generator runs my Atwood 15K A/C without any issues.

The problem with the newer Dometics is that they may have eliminated the start capacitor - which greatly increases the starting load. So I would check for the presence of a start capacitor, check the run capacitor as well and add a hard start kit (which is a start capacitor) if one is not present.
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