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Old 01-30-2018, 04:19 AM   #1
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Thumbs down Generator fuel consumption and air con question

My coach has a 5.5kw Generac gas genertor.
Manual states 10% load uses .36gph, 50% load uses .55gph and 100% load is .89gph.

Does this means a 11% load uses .55gph and 51% .89gph? Or is it not linear.

Also what load would one 13500btu air con put on the generator? Also same question but for two units?

Thanks,
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Old 01-30-2018, 06:13 AM   #2
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Because the load varies all day long (unless it’s so hot your AC never cycles off) I averaged about 2 hours per gal on mine over a 24 hour period.
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Old 01-30-2018, 06:38 AM   #3
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We have an Onan generator. I agree with the 9 to 12 gallons per 24 hours in the Florida summer heat. If you are under trees with lots of shade the generator will be under less load and use less fuel.

Usually our boondock trips range around 3 or 4 days so I fill up the tank just before going off grid. At last check the Onan registered 928 hours, still purring like a good kitten ( knock on wood while rubbing a rabbit's foot and offering T-bone steak to the generator gods)
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Old 01-30-2018, 06:46 AM   #4
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Thanks both, that makes sense as the a\c units are cycling on and off.


I will factor in 12 gallons per hour so. I have a 75 galloon tank so figure I can use about 55 gallons of it.
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Old 02-01-2018, 12:31 PM   #5
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Quote:
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Thanks both, that makes sense as the a\c units are cycling on and off.


I will factor in 12 gallons per hour so. I have a 75 galloon tank so figure I can use about 55 gallons of it.


You mean the other way around, right?
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Old 02-04-2018, 12:42 PM   #6
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With that expense it would be cheaper to get a campground with hookups. Usually Boondocking you look to follow the temps so you don’t need to run the ac.
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Old 02-04-2018, 06:26 PM   #7
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You mean the other way around, right?

Well spotted, it should have 12 gallons a day.
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Old 02-04-2018, 06:28 PM   #8
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With that expense it would be cheaper to get a campground with hookups. Usually Boondocking you look to follow the temps so you donít need to run the ac.
Hi,

We do normally go to camp grounds with power, thia ia more so for emergencies.
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Old 02-09-2018, 03:19 PM   #9
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Well, definitely it's going to be a tad spendier than being hooked up to shore power. On the other hand, you can run things as you're going down the road, versus having to stop to do so. So there are upsides both ways.

Is your coach a gasser and your genset runs on gasoline, or are you running your genset on propane? I guess my ignorance is showing again...
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Old 02-10-2018, 08:03 AM   #10
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The consumption is reasonably linear from low load to full load. I plan on 1/2 gph for low load (frig, microwave, re-charge batteries) to 1 gph for full load (two AC units)..

i.e. if we run the genny all night (10 hours) to run the AC units, I need a little less than 10 gallons (its usually about 7 gallons)
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Old 03-23-2018, 05:54 AM   #11
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For extended boondocking, a couple of the Honda 2000's with parallel kit and extended run fuel system works great. Uses less than 3 gallons all night and saves run hours on house generator. It's a bit of drama with storing them and the fuel hook up, etc., but works great. You can use just one of them set to eco mode it no A/C is needed and it powers your "house" perfectly. Running output is around 1600W each. I also have a 3100 Champion I use for "lunch stops" or short naps. It alone will run a 13.5 A/C, hair dryer or microwave, etc. It will run about 3-4 hours on one tank (<1 gallon) but does not offer an extended fuel run option as the tank is gravity fed. The Hondas are fed by a fuel pump so the extended run system connects easily. Just switching over from TT to a Chateau 35SF with diesel generator but will still carry both Hondas in the basement. We do a lot of dry camping and this saves so much fuel and offers a great back-up power system.
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