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11-25-2020, 01:13 AM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Axis 25.3
State: Michigan
Posts: 202
THOR #20290
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How much fuel does the Onan 4000 generator use in an hour?
DH wanted me to throw this question out there.
So far we have only needed to use our generator for short stints to recharge house batteries. (We also have a solar panel.) Consequently we have no idea how much fuel the generator would consume if, for example we were running it for an hour or more while boondocking.
Anyone ever monitor this and can give us some idea of what to expect?
We have a 2018 Axis 25.3, not that I think that would make a difference. We are pretty conservative when it comes to resource use (a throwback from our tent camping days); don't watch TV, enjoy the light of the campfire for the most part, early to bed, etc.
TIA.
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11-25-2020, 01:25 AM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,759
THOR #13932
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Half to three quarters gallon and hour.
It comes to about 90mpg if you're driving with the generator running.
Generator won't run if you're below 1/4 tank(ish) of fuel.
Aside:
Your v10 gets uses about point 67 gallons an hour at idle.
So running your dash ac while parked costs you 2 bucks(ish) an hour.
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11-25-2020, 01:35 AM
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#3
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I thought it was four-tenths of a gallon per hour.
But like me: my memory ain't what it used to be.
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11-25-2020, 01:39 AM
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#4
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Senior Member
Brand: Still Looking
Model: Renegade Valencia 38RB
State: California
Posts: 3,496
THOR #3156
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Here's another number half gallon an hour when under load
Imo I dont worry about it. Its such a small amount. Run it when needed and don't stress
Jerry
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11-25-2020, 02:05 AM
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#5
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,324
THOR #6903
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Fellow we camp by burns in that range close to full load and we burn about the same but at around 8-9k load, with the difference being the Diesel
Years ago I found if you ran a gas or propane generator flat out the fuel burn seemed to be on a significant upward curve so we tried to maintain around 75% load
They all cost quite bit to operate
Quote:
Originally Posted by Bob Denman
I thought it was four-tenths of a gallon per hour.
But like me: my memory ain't what it used to be.
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11-28-2020, 02:25 PM
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#6
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Senior Member
Brand: Thor Motor Coach
State: Florida
Posts: 166
THOR #17954
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Quote:
Originally Posted by lwmcguire
Fellow we camp by burns in that range close to full load and we burn about the same but at around 8-9k load, with the difference being the Diesel
Years ago I found if you ran a gas or propane generator flat out the fuel burn seemed to be on a significant upward curve so we tried to maintain around 75% load
They all cost quite bit to operate
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At 75% load a 4000 KW per Cummins Onan fuel use is 4 /10ths of a gallon. Under full load 6/10ths . Not at all a gas user. It’s basically a lawn mower engine.
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12-02-2020, 09:47 PM
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#7
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Member
Brand: Still Looking
Model: Vegas 27.7
State: Texas
Posts: 35
THOR #19813
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FOR WHAT IT IS WORTH, THE MANUAL SAYS .3 gal/hr no load, 0.5 half LOAD, .7 full LOAD
Remember Onan says to operate the generator a minimum of 2 hours per month under load (air cond is our highest load).
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12-02-2020, 10:47 PM
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#8
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Senior Member
Brand: Thor Motor Coach
State: Florida
Posts: 166
THOR #17954
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Quote:
Originally Posted by aaurbanelli@aol.com
FOR WHAT IT IS WORTH, THE MANUAL SAYS .3 gal/hr no load, 0.5 half LOAD, .7 full LOAD
Remember Onan says to operate the generator a minimum of 2 hours per month under load (air cond is our highest load).
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Could never figure that one out. Manual different than statistical numbers published by Cummins on a 4000KW gas unit. Only talking tenths so I guess they don’t care that manual different than chart published in 2017. Oh well nothing to fret over. The guzzler is the engine lol
Be safe and happy holidays
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12-02-2020, 11:04 PM
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#9
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Member
Brand: Thor Motor Coach
Model: VEGAS 27.7
State: Florida
Posts: 91
THOR #14226
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I have a Vegas 27.7 with the 4000 gen.
I filled my tank to the very tip top. I stated the gen. drove 5 mile. Keep the gen. on for 20 hours ran A/C and lived just like I was home. Drove back 5 mile and filled up again. It worked out to .521 gallons per hour. If gas cost $2.00 per gal. you are staying for an over night stay, say 12 hours it cost you $12.48. Less that a $35.00-$45.00 per night at an RV campground. Love the Gen.
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12-03-2020, 05:50 AM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: Aria 3601
State: Florida
Posts: 16
THOR #20848
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Stopped worrying about it after our first night in a HH with no hookups. Ran our 8k for 13 hours and the fuel gauge didn’t move. Continued to run for another 24, and the needle was still in the same place when we fired up the coach to continue the drive. I don’t even take the generator into account when I figure where/when to stop for fuel, other than to make sure we’re always above 1/4 tank. Don’t want the generator to shut off and have no roof A/C...-First World problems...
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2019 Thor Aria 3601
2012 Kia Soul Toad
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12-03-2020, 03:03 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,759
THOR #13932
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Quote:
Originally Posted by Luke D
The guzzler is the engine lol
Be safe and happy holidays
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My. V10 uses 67/100ths of a gallon an hour at idle with the 3000w inverter and dash ac running.
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12-07-2020, 03:14 AM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: Windsport 29m
State: North Carolina
Posts: 521
THOR #9553
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Quote:
Originally Posted by Bob Denman
I thought it was four-tenths of a gallon per hour.
But like me: my memory ain't what it used to be.
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I'm told it will vary obviously between a half gallon to 3/4 gallon and hour because when A/C or micro is used it loads the genny!
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