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Old 09-04-2014, 08:12 PM   #11
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I have a 5500 gen.. And run two 13k AC units in Fl heat with out a problem.... I also run my microwave convection oven at the same time without issue... I will mention..when I went to pickup my unit during the PDI the gen trip the breaker when both units fired up... ( didn't happen when my inspector checked it).. They had a Cummings Gen specialist there ... He checked a few things.. Had dealer change the plug for the 50amp cord ( it was loose) where it plugged into the gen.. Then he replaced the board on the gen....it's been running everything without issue... Even making the newbie mistake of firing up generator with both AC on....
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Old 09-04-2014, 08:56 PM   #12
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If you have 2-15k btu Ac units then forget it. Too much power draw. If 2-13,5k then it should work fine. I have the same genny and it will run everything and 1-15k btu Ac no problem.
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Old 09-04-2014, 11:15 PM   #13
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We have 2 15 AC units and I run them on the genny no problem when driving. Have even used th microwave. 351Ds.
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Old 09-05-2014, 08:25 AM   #14
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Been dealing with this very issue since Feb. 2013 on XL, no fix other than to consider a larger generator! Installed hard start capictors, no help, changed out transfer switch, no help, I've just learned to accept the fact that it would have been nice to have gotten the larger generator from the start!!


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Old 09-05-2014, 03:46 PM   #15
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I don't understand why it doesn't provide enough power for everything on your coach.
My 5500 watt generator powers everything on my 378 xl. Including 2 heats strips (1500 watts each)( A/C's are 1500 watts each), fireplace heater (1500 watts refrigerator, microwave and all lights with no trouble.
If it is still under warranty take it to a certified Onan dealer and have them put it under a load test.
Let us know how things turn out.
Good luck



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Old 09-05-2014, 09:47 PM   #16
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I run 2 A/C all the time and whatever else I want including the water heater (on electric) and never once have I blown a breaker. 3+ years.....something is wrong with the generator. I would start by checking the voltage output by starting the generator without load and checking the voltage at one of the outlets. I would say ideal is 115-120V with a preference of 120V. Then start the A/C's one by one and see if the voltage is maintained at the outlet. As voltage drops, more current is drawn and that will blow the breaker every time. I'm guessing the generator voltage is either set too low or is not being maintained with a load. One trick is to have the voltage set 2-3 volts higher than the specs. It won't hurt anything and will lower the current draw.
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Old 09-06-2014, 02:18 AM   #17
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Both A/c's won't always run on generator especially when hot (when needed most!)

How do you set the voltage? I didn't know it was adjustable???

I have been fightin tryin to run 2 a/c's all day-- it ain't happenin!!!!

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Old 09-06-2014, 09:04 PM   #18
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Sorry, I now realize the voltage is electronically controlled at 120 volts. I don't think the Onan 5500 has an adjustment. Check the voltage as described earlier. It should stay right at 120v.


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Old 09-08-2014, 09:01 AM   #19
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Both AC's

My 2011 378 has the same 5500 onan. Runs everything at the same time with no problem. 2-13.5s in my unit. The only problem I have is that with both ac's on, traveling down the road, the transfer switch shuts off power to everything especially during drive over very rough roads.
Called Parallax and asked about the ATS 501 transfer switch in my unit, and the gentleman said that this switch was not designed for a moving vehicle such as a motorhome. For fixed installations it was fine, but extreme vibration would cause it to turn off power. If that is the case, G-town needs to look at another brand that is up to the task!
We are still extremely happy with our unit, and April Conner has helped get all the problems fixed. I only wish the overhead front drop down bed had been available when we bought our unit from Lazy Days.
Happy camping!
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Old 09-08-2014, 11:45 AM   #20
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That could possibly be the case. As the only time I use the generator is when I'm driving.
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