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Old 12-16-2016, 11:41 AM   #1
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Using Generator to Run AC While Driving

We just went from a Class C motorhome to a Class A motorhome with a
Ford V-10. We were told during the PDI on our new unit that it's best to run the AC using the generator while driving. We were told it would improve the gas mileage.

Can I have thoughts on what some of you do??

Thanks very much!
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Old 12-16-2016, 11:43 AM   #2
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I might be wrong but I don't think the air conditioners will run without the generator.
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Old 12-16-2016, 11:53 AM   #3
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Using Generator to Run AC While Driving

Think if it as driving a car. You will get better mileage without the AC than you would with the AC running. By putting the load on the generator, you're keeping that load off of the engine.

Not sure how valid, but I think that this is what they were trying to say.

We are also talking about two separate AC systems with the comment. First is the dash air running off of the engine, and the second is the "house" air running off of the generator.
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Old 12-16-2016, 11:58 AM   #4
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Quote:
Originally Posted by Raven13 View Post
We were told during the PDI on our new unit that it's best to run the AC using the generator while driving. We were told it would improve the gas mileage.
If you need the A/C you have two options: the engine A/C or the house A/C. Using the house A/C requires using the generator. It will likely consume less fuel than using the engine A/C which is also less efficient. You were informed correctly.

Congratulations on the new purchase!
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Old 12-16-2016, 12:11 PM   #5
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Quote:
Originally Posted by Raven13 View Post
We just went from a Class C motorhome to a Class A motorhome with a
Ford V-10. We were told during the PDI on our new unit that it's best to run the AC using the generator while driving. We were told it would improve the gas mileage.
Can I have thoughts on what some of you do??
Thanks very much!
Raven13
IMO there's no reason to run the generator while driving ...unless you need the AC the generator produces to run the roof A/C unit(s), or electric space heater(s), while driving.
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Old 12-16-2016, 12:17 PM   #6
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Quote:
Originally Posted by Raven13 View Post
We just went from a Class C motorhome to a Class A motorhome with a
Ford V-10. We were told during the PDI on our new unit that it's best to run the AC using the generator while driving. We were told it would improve the gas mileage.

Can I have thoughts on what some of you do??

Thanks very much!
It will no doubt cool the whole MH but less fuel? I seriously doubt that Ideal and unless extremely hot out your dash air should keep u and chubby cool enough
A onan 5500 burns a gallon per hour under heavy load I doubt the motor rotary ac compressor has enough engine drag these days to cause such fuel consumption
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Old 12-16-2016, 12:20 PM   #7
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The affect on gas mileage is so minimal as to not even worry about it.

On our trip to Key West last year from Atlanta in our 2015 gasser, I did not run the AC on the genny on the way there but I did on the way back home. We blew a dash AC hose right after we left Key West.
The difference in mileage was only .1 MPG.
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Old 12-16-2016, 12:24 PM   #8
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The affect on gas mileage is so minimal as to not even worry about it.

On our trip to Key West last year from Atlanta in our 2015 gasser, I did not run the AC on the genny on the way there but I did on the way back home. We blew a dash AC hose right after we left Key West.
The difference in mileage was only .1 MPG.
if you drive 60 miles per hour and run a 5500 or larger gas gen set it burns about one gallon per hour(under load) or one extra gallon every 60 miles
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Old 12-16-2016, 12:27 PM   #9
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The difference in fuel use (unless you're parked) will be negligible. You're going to need lots of gas/diesel to get from A to B and running "all" of the AC units really won't make much of a difference IMO.


p.s. 87.3 % of the advice given from the dealership should be triple checked.
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Old 12-16-2016, 12:27 PM   #10
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The affect on gas mileage is so minimal as to not even worry about it.

On our trip to Key West last year from Atlanta in our 2015 gasser, I did not run the AC on the genny on the way there but I did on the way back home. We blew a dash AC hose right after we left Key West.
The difference in mileage was only .1 MPG.
Is that a .1 difference between using the dash AC and running the generator to power the house AC.
Or is it a difference from mileage with no AC running at all and running the generator?
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Old 12-16-2016, 12:37 PM   #11
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In my rig in hot country the dash air keeps the pilot and co-pilot much more comfortable than the roof air.

We don't normally run the roof air while driving - may make an exception for a planned run up the Grapevine this summer.

Our SOP for summer has us turn the genny on about 3 or 4 minutes before we plan to stop - the roof air kicks on and starts to cool the back half of the coach.
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Old 12-16-2016, 12:39 PM   #12
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I run my generator for the AC in my CS. However, gas milage is unchanged.
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Old 12-16-2016, 12:43 PM   #13
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Here we go again.....seach function works pretty good on this site
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Old 12-16-2016, 12:46 PM   #14
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Is that a .1 difference between using the dash AC and running the generator to power the house AC.
Or is it a difference from mileage with no AC running at all and running the generator?
We only ran the dash AC to Key West. We ran the genset for the roof AC's on the way back because of the blown AC line. So to answer your question, yes, that was the difference.
My wife tracked mileage religiously in our Mirada with an APP on her phone.
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