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Old 07-07-2016, 12:48 PM   #11
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I would try running the AC with everything else off. I would pop the breakers for everything but the main and AC. Let the generator run for a few minutes and try it then. The converter can take quite a bit of power if the batteries are low. Another thing I thought of, you might have a spark arrester on the muffler. Take that out and clean it, often. I had mine plug up on my portable, it would barely start it was so bad.
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Old 07-07-2016, 01:38 PM   #12
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Dometic AC problem

I am having similar issues. I can run the front or back AC but not both. Also one of the 20 amp breakers tripped and will not reset. I have an appointment with the Cummins Dealer on 7/18.
2016 Georgetown 378XL with a 5500 Cummins gas genset with less than 30 hours.
Will post what I find out from the dealer.

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Old 07-07-2016, 07:47 PM   #13
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Rejet

I have two yamaha ef2000 v2is inverter/generators paired. in SLC Utah at 4200' elevation I can only run my fridge and 1350Watt Coleman roof A/C.
If I dry camp (usually do)at 5600' to 6900' With fridge on propane and A/C on the A/C proves too much after about 35 seconds the gens cut producing power to protect itself and the appliance.
Yamaha service center says stock Carb. jet is designed for sea level to 4000 feet elevation. getting too much gas and not enough air. I need to install a high altitude kit that will have a jet that is two sizes smaller.
also a hard start capacitor on a
A/C unit would also help.
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Old 07-07-2016, 07:54 PM   #14
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dometic AC on Generator

I just tracked down the same problem. I didn't realize I had the Electric hot water switch on (it's outside).
Still should not have been a problem with my new Champion 3200 generator except I happen to be in an area where ethanol gas it quite popular. I did something unusual for me ... I read the gen. manual. It said not to use octane levels of gas below 85 or more than 10 percent ethanol. I used 87 and I don't know the content of ethanol but I must have had a reduced HP output. When I turned on the AC with hw engaged ... bingo ... killed the generator.
I turned off the 'outside' hw elec. switch got high octane gas and ran the generator and AC all night last night with no problems.

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Old 07-11-2016, 08:44 AM   #15
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Looks like fuel pump is ok. I am currently running the generator for a half an hour. Seeing if that will help prior to me turning on the AC.
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Old 07-11-2016, 10:16 AM   #16
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Does anyone know if this can be an AC issue? If so is there a way to troubleshoot.
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Old 07-11-2016, 10:37 AM   #17
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Quote:
Originally Posted by Jagspe View Post
Does anyone know if this can be an AC issue? If so is there a way to troubleshoot.

If the AC is running on shore power not likely the AC. Your 4000 Onan is more than enough to run a 15,000 BTU AC.
My brother has a 2013 Onan 5500 in his Toy Hauler, his issue was that it would run fine when running a load (AC), but would stall as soon as not under a load. He tried everything, including removal of the carburetor. He finally took it to an authorized repair shop.They replaced the carburetor and runs fine now.Per the shop not worth the cost to rebuild…shop also said they have recently seen some with similar issues.
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Old 07-11-2016, 11:37 AM   #18
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I can run the microwave with no issue on the generator.
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Old 07-11-2016, 11:48 AM   #19
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Quote:
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I can run the microwave with no issue on the generator.

A 15,000 btu, AC takes between 3300-3500 at start and 1300-1800W to run.
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Old 07-11-2016, 11:54 AM   #20
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Dometic AC on Generator

15k btu a/c takes closer to 2500 watts to start and about 1800 to run.


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