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Old 04-04-2015, 07:09 PM   #1
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Generator in auto-mode w/ driving

Can the generator run in auto-mode while driving?
Coach gets too hot to drive without the roof AC on.
Does the generator have to run constantly while driving to do that?
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Old 04-04-2015, 07:51 PM   #2
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I would just give it a try don't know why it wouldn't work. I never had to since the dash air did a good job with the SENECA.
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Old 04-04-2015, 08:16 PM   #3
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UM, dont think that is a very wise idea. Generators are not built like vehicle motors. They are designed for stationary use, I read in awhile ago that some one was doing this, the generator will usually trip when you hit a but because the oil sloshes around and the generator will shut off on low oil. More over the electricity is being generated with a stator and rotor assembly that probably isn't designed to be bounced while running(check with cummins onan) this assembly although quite robust is fragile. i dont think for me personally the risk is worth the reward. I dont want to go into too much more detail. I could write pages about the reasons i would NOT both from a safety and Power Engineering background.
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Old 04-04-2015, 08:24 PM   #4
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[QUOTE=fam cruiser;286660] UM, dont think that is a very wise idea. Generators are not built like vehicle motors. They are designed for stationary use, I read in awhile ago that some one was doing this, the generator will usually trip when you hit a but because the oil sloshes around and the generator will shut off on low oil.[ /QUOTE]
A very large number of MH owners drive with the geny running all the time with no adverse affects. Most doing that think it is more efficient to run the geny and roof air than the dash air. The RV geny's are desinged to be used that way. As I said I never found the need.
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Old 04-04-2015, 08:34 PM   #5
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We kept the generator (also an Onan) on our boat going all the time we were out... It ran the AC and radar. That thing was rocked and rolled all over the place, and never suffered any ill effects (although I did).

I really don't see hove movement could effect them... just my opinion.

Having said that, I'm not sure about the auto mode. Generators seem to like continuous duty more than a lot of stopping and starting. The generator on the boat went to idle mode when the demand dropped. That's something that I wish that the genset in the motorhome did. Dropping to idle when not under a load would save fuel.
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Old 04-04-2015, 09:00 PM   #6
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I've run the generator on the road (specifically to power the A/C) a few times and never had a problem. Fam Cruiser's post is the first negative I've heard about running the genset in all the years I've been RVing.
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Old 04-04-2015, 09:00 PM   #7
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I Stand corrected. directly from the cummins site.

Q: Is it practical to power the roof air conditioner with my generator
while traveling on the road?
A: Yes, that is what a generator is for, portable electrical power. In fact, it can
help lower fuel consumption because the generator uses less fuel than your
vehicle engine. Plus, it gives you an opportunity to exercise your generator. Any
appliance that can be run in a stationary position can also be powered while
driving.

Not for me, But hey what ever floats your boat
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Old 04-04-2015, 09:24 PM   #8
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Fam Cruiser, Interesting statement from Cummins. I really didn't think of it in terms of saving fuel but of keeping the passengers in the back cool when the cab air wasn't up to keeping the back of the house (and passengers) cool enough. When I would be running the generator I would also be using the cab air.
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Old 04-04-2015, 10:39 PM   #9
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We run ours on the road to power the roof a/c occasionally, but mainly to brew a cup of coffee or cook something in the microwave!!
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Old 04-05-2015, 07:43 AM   #10
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Thanks guys. My question was more specifically, can it be run in auto mode so it only comes on as needed by the ac/thermostat. The Manual says in auto mode, to prevent constant stopping and starting, it will run in no less than 10 minute intervals. I thought it would be more efficient than running it 8 hours straight on a long driving day, but the manual also "seems" to indicate that it will only run in auto mode while stationary; so I am unsure and thought someone must have figured this out before me...
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