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06-04-2017, 07:18 PM
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#1
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Senior Member
Join Date: Apr 2017
Location: Colorado Rockies
Posts: 152
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Generator fuel useage
For those with an Onan 5.5kw propane powered generator; about how much fuel does it use based on a moderate load; say one AC, converter, etc?
When I picked up my unit, they told me the propane tanks were full; of course no way to verify this. The generator ran for about 4 hours with a moderate load before the first tank ran out.
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Scott & Alta
2017 Montana 3160RL, Legacy Edition, Full Body Paint, Onan 5.5Kw
2019 Ford F450 PSD
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06-05-2017, 06:30 AM
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#2
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Senior Member
Join Date: Aug 2014
Location: Lincoln, NE
Posts: 422
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The only sure way is to fill a tank and run it dry with your average load.
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06-05-2017, 06:53 AM
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#3
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,846
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The data I've seen indicates a 5.5KW generator at "half load" will consume about 0.8 gallons of LP per hour. So, at half load, you should get around 7 hours on a 30 pound/7.5 gallon LP tank (that's actually slightly more than 6 gallons of capacity with the expansion/safety valve). If you're using more than "half load" that will significantly reduce the run time.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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06-05-2017, 07:00 AM
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#4
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Senior Member
Join Date: Oct 2014
Location: Germantown, TN
Posts: 6,308
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I agree with both John and Cardinal. The Cummins site claims usage at Cummins Onan 4-Cycle OHV V-Twin Engine (.8 Gal/H @ 1/2 Load). My neighbor in our Florida RV park was whining one day that his generator used "a whole damned tank of fuel in one night."
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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06-05-2017, 12:09 PM
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#5
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Senior Member
Join Date: Jul 2015
Location: Texarkana, TX
Posts: 1,052
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Quote:
Originally Posted by notanlines
My neighbor in our Florida RV park was whining one day that his generator used "a whole damned tank of fuel in one night."
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That's about right if he's talking about an external generator in the 3500-4500 watt range. 5 gallons, .75 gal/hour = ~7 hour run time...
When we run a Champion 3500 to drive an AC, fill it up before bed and it shuts down before breakfast...
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06-05-2017, 12:51 PM
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#6
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Senior Member
Join Date: Oct 2014
Location: Germantown, TN
Posts: 6,308
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Sorry, DCG, he was talking about a tank of LP.
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06-05-2017, 12:52 PM
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#7
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Senior Member
Join Date: Oct 2014
Location: Germantown, TN
Posts: 6,308
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Sorry, DCG, he was talking about a tank of LP. But I'm certain there was a little exaggeration involved
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06-05-2017, 01:33 PM
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#8
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Senior Member
Join Date: Jul 2015
Location: Texarkana, TX
Posts: 1,052
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Thanks, guys.. LP is measured in gallons too, right? I think you use 20% more or so than gas, but that's "ballpark".
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06-05-2017, 09:38 PM
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#9
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Senior Member
Join Date: Nov 2016
Location: Sussex, NJ
Posts: 471
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For comparison, our Onan Marquis 7000 would run out a 40 lb bottle of propane in 8 hours with the 13,500 BTU A/C running the whole time.
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2016 Fuzion 414 Chrome
2016 Ford F450 Super Duty King Ranch
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