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08-11-2022, 03:37 PM
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#1
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Member
Join Date: Aug 2018
Location: Austin, TX
Posts: 33
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How much gas…
First time boondocking. We have a gas generator, 4000 watts, and a 15,000 btu A/C unit, any idea how much gas it uses per hour?
The Mo-Rons
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The Mo-Rons
2019 Lance 2375 TT
2017 Dodge Ram 1500 Hemi
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08-11-2022, 03:40 PM
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#2
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Oct 2015
Posts: 1,718
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If on the AC is running, I would say about .8 gallon per hour.
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Paul J Stough Iowa
2005 Winnebago Voyage 38J
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08-11-2022, 08:04 PM
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#3
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Senior Member
Join Date: Feb 2015
Location: Indiana
Posts: 171
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Our Onan gold, uses about .4 an hour with 2 13,000 units running..
Bob
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2008 Damon Thor Outlaw
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08-12-2022, 05:00 AM
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#4
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Senior Member
Join Date: Jun 2019
Posts: 248
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Top off your tank before you park.
And remember the gen will stop running at approximately 1/4 tank.
If you want to know your generator burn rate...keep track of the hours the gen runs. Then top your tank again right after you pack up and leave the boondock.
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08-13-2022, 12:18 AM
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#5
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,201
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Pretty sure onan provides estimated fuel burn based on percentage of load for all models.
https://www.google.com/url?sa=t&sour...lzmzN5iCMf9rnc
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95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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08-13-2022, 03:47 PM
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#6
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Aug 2004
Location: Oregon
Posts: 2,720
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Yo have to remember, that if the generator is running , then it is running everything in there, not just the AC. 
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Retired Navy Submariner
2014 Itasca Sunstar 35F; 5 Star tuned; 2014 Jeep Cherokee TrailHawk
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08-13-2022, 04:41 PM
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#7
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Senior Member
Join Date: May 2020
Location: Vegas
Posts: 341
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Quote:
Originally Posted by PJStough
If on the AC is running, I would say about .8 gallon per hour.
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This is a pretty good estimate,
Granted ours 3500 on our last trip ours averaged .7-.8 per hour with the ac running.
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08-13-2022, 05:14 PM
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#8
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 26,775
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As a rule of thumb, Onan's use about 0.5 gal/hr at 50% load. A bit more for the larger ones, a bit less for the smallest sizes, but that's a pretty solid guestimate. A late model 15,000 btu a/c uses about 1200 watts, which is 1200/4000 (30%) of the generators full load capacity. That works out to be about 0.3 gal/hr for the a/c alone, but it's never alone. Your converter/charger runs whenever the genset is running, and the fridge auto-switches to electric mode too, so a good estimate would be about 0.4 gal/hr.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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08-14-2022, 10:58 AM
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#9
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Senior Member
Join Date: Nov 2008
Location: Kennewick, Washington
Posts: 410
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Quote:
Originally Posted by hedhunter9
Our Onan gold, uses about .4 an hour with 2 13,000 units running..
Bob
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I believe I would have kept that unit! Our 5.5 uses .9 at full load.
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2004 Flair 33R, 336 watts solar, Dometic Sidewise frig. Pan hard bars, front and rear, CHF, Timbrens front and rear, Roadmaster reflex steering dampener. Doug Thorley Tri-y headers, Ultra RV tune.
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08-14-2022, 02:55 PM
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#10
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,810
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What is the fuel usage that the owner's manual shows for your generator.?
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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08-14-2022, 09:58 PM
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#11
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Senior Member
Join Date: Apr 2017
Location: Vista, Ca
Posts: 495
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Plan for 3/4 gallon per hour of use.
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1992 Dodge D250, 18cm housing, getrag 5sp, 4" straight pipe
2015 Pacific Coachworks Sand sport 18SLE
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08-14-2022, 10:29 PM
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#12
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Senior Member
Join Date: Apr 2005
Posts: 4,231
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It’s been awhile but I seem to recall about 1/2 a gallon per hour with one AC and the fridge etc.
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