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Old 06-04-2013, 11:43 AM   #1
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Genset fuel consumption

Has anyone figured out the approx. fuel usage on a 7500 diesel genset at about half load ?

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Old 06-04-2013, 12:45 PM   #2
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I believe mine uses about 1/2 gallon an hour..but don't know about half load could be more..

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Old 06-04-2013, 12:57 PM   #3
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page 13 or thereabouts ...
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Old 06-04-2013, 12:57 PM   #4
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Per Cummins

Typical fuel consumption

No. 2 diesel fuel, Gal/hr (L/hr) No load Half load Full load

7.5 HDKAT no. 2 diesel fuel, Gal/hr (L/hr)
No load 0.21 (0.79)
Half load 0.56 (2.12)
Full Load 0.96 (3.63)

For newer models try Cummins Onan
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Old 06-05-2013, 01:27 PM   #5
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PowerTech 7.0KW

50% load = .32 GPH

from the manual
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 06-05-2013, 03:49 PM   #6
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Half load on an Onan7500 will operate just about everything in the coach simultaneously, so rarely will consumption exceed 0.56 gal/hr. Usually much less. Mine averages around 0.3.
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Old 06-05-2013, 04:44 PM   #7
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i plan 1/2 gal per hour to gauge fuel burn of the whole coach when we are running down the road in the summer time
we most often use at least one roof a/c
and if i get the roof vents right, i can shut down the dash air.
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Old 06-05-2013, 08:09 PM   #8
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Most of the books say approximately .5 gal an hour at half load. My experience has been far less, but half load is pulling a lot. Last year I was at an NHRA event and we ran our generator all weekend with the air and average was far less than .5 gal.

I would say Gary's estimate above at .3 is closer to what I have experienced.

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