Community Forums

DHart · 07-26-2011, 05:51 PM

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)?

akadeadeye · 07-26-2011, 05:57 PM

Quote:

Originally Posted by DHart

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

YC1 · 07-26-2011, 05:57 PM

Light load, about .25 gph. If running ac hard then average .5gph.

Pusherman · 07-26-2011, 06:18 PM

The above posts are correct. Somewhere between 0.5 gph under normal loads.

dons2346 · 07-26-2011, 08:28 PM

Don't you have the manual for the generator? There are tables that will tell you what the fuel burn will be.

Gary1965 · 07-26-2011, 08:29 PM

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.

DHart · 07-26-2011, 08:38 PM

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.

RJay · 07-26-2011, 09:02 PM

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)