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Old 09-22-2015, 06:47 PM   #1
Join Date: Sep 2015
Posts: 50
Roof Air/Gen Set problem

We have just purchased a 2007 34DDS. We have an unusual problem: The air conditioners work fine on shore power. Once we disconnect shore power and switch to Genset, the front air conditioner starts, then when the back one starts, it shuts everything down. The air conditioners won't work running on inverter/battery. Any thoughts?

Thanks for your input!

Also, our dash air runs cool when we start the coach, but then goes hot and stays hot. Good thing we're getting cooler weather now!

Thanks for any suggestions!

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Old 09-23-2015, 02:23 PM   #2
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Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,174
They should not work on Inverter.. But should on the generator.

However we are way short on info.. You need to do a few things.

First,, Obtain a decent clamp on ammeter.. Harbor Freight has one that is decent in the less than 20 buck range but Sears has two in the 50-150 dollar range that I would recommend.. They do both DC and AC (The HF one is AC only).

Now, identify the wires that feed power to the A/Cs.. Many places you may be able to access them.. Clamp on the white wire and read the amps. Just the wite, no other wire. (Or if you like just the black, you can use either one but I'd rather play with the white, safer)

Write 'em down and post.

Home is where I park it!
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Old 09-23-2015, 03:10 PM   #3
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Join Date: Oct 2014
Posts: 340
Correct, the roof A/C's should not work from inverter power. They only work from generator or shore power.

I will speculate on our dash A/C issue: Since it works when you first start, the A/C system itself is working. But, as the engine runs, the dash heater sounds like it is ON. The dash heater can certainly overpower the dash A/C (the air goes through both the heater core and A/C evaporator before coming out the vents.

Really don't have enough information to draw a conclusion on the roof A/C shutting down the generator. Could be something as simple as a clogged air filter that does not allow the generator to pick up the additional load. Could be as wa8yxm suggests a load issue with one of the A/C's. In addition to his amp-draw test, did you notice voltage (at any of the house-type outlets) when the generator shut down? If for any reason the generator is unable to supply voltage within its programmed range, it will automatically shut down.

More information will help in pinpointing the problem.

2003 Alpine 38FDDS
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Old 09-24-2015, 05:46 AM   #4
Join Date: Sep 2015
Posts: 50
Roof air

Thanks everyone for your input on this! We conducted some troubleshooting and found it may be the compressor on the roof air. The fan continues to work with the generator, but as soon as the cool function is activated, they both shut down. Going to take it to TransWest in Denver in a couple weeks to have them go through it.

Did not know it's not supposed to work on inverter. That's good to know. Makes sense.

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