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Old 10-13-2013, 03:44 PM   #11
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If I recall properly the Generator uses approximately 1 gal/ per hour on 50% load. Your AC unit is not quite half the load when running.
Thanks for the info. If you cruise at 65 and the coach gives you ~8 mpg then the coach will use ~8 gallons in one hour. So, does it mean that technically the generator gives you 64 mpg? Not sure if I did that correctly. Now, I would like to figure out the difference in MPGs for the engine running with and without the AC compressor.

Is it more economical, on long trips, to run the coach's AC unit vs. the engine's AC compressor?
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Old 10-13-2013, 03:47 PM   #12
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I just found the following on an RV site:

If your RV at 55 mph gets 10 MPG with the A/C off, running the A/C can bring that down to 8.5 MPG, which would be 1.5 gallons of fuel per mile used just to run the engine driven A/C compressor. Running the generator and roof A/C instead uses 1/2 gallon per hour. The Engine driven A/C also uses up to 8 HP, which means less power on hills, as well as more heat for the poor overworked engine.
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Old 10-14-2013, 07:00 AM   #13
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Thanks for the info. If you cruise at 65 and the coach gives you ~8 mpg then the coach will use ~8 gallons in one hour. So, does it mean that technically the generator gives you 64 mpg? Not sure if I did that correctly. Now, I would like to figure out the difference in MPGs for the engine running with and without the AC compressor.

Is it more economical, on long trips, to run the coach's AC unit vs. the engine's AC compressor?
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Name:	Onan Fuel Use.jpg
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ID:	41065 My original post was wrong. Sorry, Once I got the chance I found the info in the book. Here is the info straight from the Onan Manual.
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Old 10-14-2013, 07:26 AM   #14
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I have a class C Sunseeker rather than the Georgetown but saw this and wanted to chime in... If it's just a crockpot, you might be further ahead to pick up a portable inverter at Walmart, run it off a cigarette lighter outlet (or 12 volt outlet somewhere), and run the crockpot off of that. Some outlay for the inverter but then free. Agreed, the generator doesn't use much fuel (it's in the generator owners manual) but why use any just for a crockpot.
I am sure you have not actually done this.

Most "cigarette lighter" (accessory) outlets are current limited (rated) to about 9 amps @ 12 volts DC. That is about 100 watts maximum.

Most crock pots are over 300 watts of 120 volts AC or over 3 times that power requirement. A 300 watt crock pot will draw (300/12) amps or about 25 amps from an inverter.

No accessory outlet can handle that load.
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Old 10-14-2013, 03:34 PM   #15
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You need one of these. Make sure you put it in the sink on top of some non-skid padding.

Amazon.com: RoadPro RPSL-350 12V 1.5 Quart Slow Cooker: Automotive
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Old 10-14-2013, 04:23 PM   #16
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I had wanted to make coffee without using the generator ... so, thought about getting one of those plug in Inverters that they sell at truck stops. Will charge a phone, but not enough power for a coffee pot ... so, I'm sure not enough for a crock pot. So, when making coffee, I start up the gen.
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Old 10-14-2013, 05:41 PM   #17
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Not sure why people don't want to use their generators. It's good to use them since they sit most of the time. Besides, they barely sip on gas. My coach has a remote start and I can start it without having to stop. If I had to make a cup of coffee while on the road, just flick the switch and have power.
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Old 10-14-2013, 06:53 PM   #18
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Related to the original question - my inverter on the 351DS only powers the fridge. Is there way to get it to power addl outlets? E.g. can I install a 2nd inverter?
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Old 10-14-2013, 07:11 PM   #19
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Sorry for the hijack. Yes, you can add 100 inverters if you want to power your coach and the neighbors as long as your batteries will take it. The hard part is the wiring.

Why bother though, fire up the gen when you need 110v. That is why is there for.
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