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Old 06-29-2010, 06:42 PM   #1
jking's Avatar
1984 31' Limited
1983 31' Airstream310
Oriental , North Carolina
Join Date: May 2004
Posts: 180
Question Generator Propane Consumption?

Does anyone have an idea what the "normal" propane consumption should be for the Kohler 7kw generator? Mine ran a full tank dry in two hours, which seems mighty short.

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Old 06-29-2010, 07:17 PM   #2
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1999 23' Safari
Perrysburg , Ann Arbor
Join Date: Sep 2005
Posts: 914
Here's some guideline info. from the folks at US Carburetion ...
Fuel Consumption

The short version is that one KW requires about two horsepower (under load)
while those two horsepower require about 20,000 BTU per hour
while propane contains about 92,000 BTU per gallon
and a gallon of propane weighs about 4.2 lbs.

So, a 7 kw generator ought to need about 14 hp. at full load, using about 140,000 btu per hour or a little over 1.5 gallons per hour or a little over 6 pounds per hour, if my math is right.

I've never run my generator long enough on propane to run a tank dry, so no real-world experience to relate, and these guidelines are the best I can do to help.

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Old 06-30-2010, 07:00 AM   #3
jking's Avatar
1984 31' Limited
1983 31' Airstream310
Oriental , North Carolina
Join Date: May 2004
Posts: 180
Thanks for the basic info - pretty much agrees with the standard text - given the average 30% energy efficiency of internal combustion engines and the puny 21 gal tanks in the classic A/S mohos, that means the best we can expect is about 4 hours. I'll also see what the OEM has to say. Thanks again.
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