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Old 07-26-2011, 06:51 PM   #1
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Generator fuel consumption

We recently got a Class A diesel pusher with an Onan Quiet 7.5 generator.

Does anyone have any idea how much diesel fuel is consumed by this generator per hour under a light load such as recharging house batteries and running a few lights?

Any idea how much is consumed per hour under a heavier load (running both AC units)?
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Old 07-26-2011, 06:57 PM   #2
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Quote:
Originally Posted by DHart View Post
We recently got a Class A diesel pusher with an Onan Quiet 7.5 generator.

Does anyone have any idea how much diesel fuel is consumed by this generator per hour under a light load such as recharging house batteries and running a few lights?

Any idea how much is consumed per hour under a heavier load (running both AC units)?
I have been told by others on this forum that light loads as you describe will consume about 1/2 gal. per hour and heavy loads (2 ac's running and other things) may consume about 1 gal. per hour. I have not tested it and I am not sure how I could with any degree of accuracy, and I really don't care so long as the generator shuts down, as it is supposed to do, at 1/4 tank of diesel fuel so I can get to the next fuel stop.

Don
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Old 07-26-2011, 06:57 PM   #3
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Light load, about .25 gph. If running ac hard then average .5gph.
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Old 07-26-2011, 07:18 PM   #4
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The above posts are correct. Somewhere between 0.5 gph under normal loads.
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Old 07-26-2011, 09:28 PM   #5
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Don't you have the manual for the generator? There are tables that will tell you what the fuel burn will be.
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Old 07-26-2011, 09:29 PM   #6
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I have a 8.0 generator. According to my manual, the generator burns 1 gallon per hour at full load. Because you almost never run at full load, the previous posts of .25 - .50 gallons per hour are pretty accurate.
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Old 07-26-2011, 09:38 PM   #7
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I didn't realize that the generator manual would list gph... definitely a good starting point. And it's always good to hear from other's experiences as well, really. Many thanks to those who posted their experiences.
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Old 07-26-2011, 10:02 PM   #8
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I took this from my 7.5 KV Onan manual.

Diesel No Load Half Load Full Load
gal/h l/h gal/h l/h gal/h l/h
7.5HDKAJ 0.13 (0.49) 0.49 (1.85) 0.96 (3.63)
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Old 07-26-2011, 10:11 PM   #9
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Great info everyone... thanks very much!
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