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Old 10-07-2013, 03:59 PM   #1
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Question generator fuel consumption

Does any one know about how much fuel a 7.5 diesel Onan genator will use under moderate use??
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Old 10-07-2013, 04:10 PM   #2
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If I recall, don't hold me to this, but I think it was like one quart per hour??
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Old 10-07-2013, 04:10 PM   #3
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.8-1.0 gph
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Old 10-07-2013, 04:11 PM   #4
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Would plan on 1/2 + per hour, closer to 1 gal per hour under full load. Might have more information in generator manual.
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Old 10-07-2013, 07:03 PM   #5
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Onan says 0.5 gal/hr at 50% load. 50% on the 7.5 is a lot of watts (3750), so the typical usage is more like 0.25-0.4 per hour.
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Old 10-07-2013, 07:05 PM   #6
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What Gary said!
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Old 10-07-2013, 09:32 PM   #7
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I have actually measured this on similar, but not identical APU and Gary's numbers are close enough that they are a real good start.

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Old 10-07-2013, 11:19 PM   #8
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I've been using 0.6 gph for over a year to calculate fuel usage and mileage, and all the resultant numbers seem to make sense.
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Old 10-07-2013, 11:33 PM   #9
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Aren't there several models of the Onan 7.5 in use? Aren't some variable rpm and others set rpm? The low rpm set ones will use less fuel.
Our 8Kw PowerTech uses .71 gph at full load and only .26 at 25%. It's powered by a 3 cyl Kubota running at 1800 rpm.
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Old 10-08-2013, 09:20 PM   #10
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As a last resort I looked in the manual for my 8 KW Onan, here's what it said:

No load: .13 GPH.
Half load: .5 GPH.
Full load: 1 GPH.
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Old 10-08-2013, 09:48 PM   #11
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Consumption will be aprox. 1/2 to 1 Gal per hr. Depending on load on the Genset.
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Old 10-08-2013, 10:38 PM   #12
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Quote:
Originally Posted by Mr_D View Post
Aren't there several models of the Onan 7.5 in use? Aren't some variable rpm and others set rpm? The low rpm set ones will use less fuel.
Our 8Kw PowerTech uses .71 gph at full load and only .26 at 25%. It's powered by a 3 cyl Kubota running at 1800 rpm.
Mine is a 2000 model and is variable-speed.
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Old 10-08-2013, 10:47 PM   #13
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Fill the tank.
Drive to park/home noting miles driven and average MPG.
Run the genny overnight with average load.
Go fill the tank (miles, avg MPG, yadda-yadda)
Press fingers to calculator.
It will be a fair guess.
;-)

Best wishes!
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Old 10-08-2013, 11:36 PM   #14
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Ran my onan 8kw for 8 straight days under heavy load (ACs set 70 in Texas summer heat) and used 65 gals. equals .33 gals/hr
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