RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 10-07-2013, 03:59 PM   #1
Member
 
Join Date: Feb 2012
Location: Coos BAy Or or Quartsite Az.
Posts: 67
Question generator fuel consumption

Does any one know about how much fuel a 7.5 diesel Onan genator will use under moderate use??
myliladog is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 10-07-2013, 04:10 PM   #2
Senior Member
 
mahon1993's Avatar
 
Join Date: Mar 2010
Location: Fowlerville, Mich.
Posts: 606
If I recall, don't hold me to this, but I think it was like one quart per hour??
__________________
2000 Monaco Diplomat 40PBD
2012 Grand Cherokee Limited
2008 FatBoy, three spoiled Great Danes and a cat.
mahon1993 is offline   Reply With Quote
Old 10-07-2013, 04:10 PM   #3
Senior Member
 
Spinner's Avatar
 
Join Date: Sep 2012
Location: MN
Posts: 292
.8-1.0 gph
__________________
Spinner & Gang
2000 MADP ISC350 2003 Jeep Liberty toad
"Working towards the next vacation!"
Spinner is offline   Reply With Quote
Old 10-07-2013, 04:11 PM   #4
Senior Member
 
no3putt's Avatar
 
Join Date: Apr 2012
Location: Pueblo, CO
Posts: 614
Would plan on 1/2 + per hour, closer to 1 gal per hour under full load. Might have more information in generator manual.
__________________
2009 Berkshire 390 QS and toad
Retired and traveling
no3putt is offline   Reply With Quote
Old 10-07-2013, 07:03 PM   #5
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 23,306
Onan says 0.5 gal/hr at 50% load. 50% on the 7.5 is a lot of watts (3750), so the typical usage is more like 0.25-0.4 per hour.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 10-07-2013, 07:05 PM   #6
Senior Member/RVM #90
 
MSHappyCampers's Avatar


 
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 43,852
What Gary said!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is online now   Reply With Quote
Old 10-07-2013, 09:32 PM   #7
Senior Member
 
MattC's Avatar
 
Join Date: Feb 2012
Location: SE Michigan
Posts: 459
I have actually measured this on similar, but not identical APU and Gary's numbers are close enough that they are a real good start.

Matt
__________________
A lifelong waterman and his bride going dry places for as long as the fuel money lasts.
MattC is offline   Reply With Quote
Old 10-07-2013, 11:19 PM   #8
Senior Member
 
JFXG's Avatar
 
Newmar Owners Club
Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, NC
Posts: 4,453
I've been using 0.6 gph for over a year to calculate fuel usage and mileage, and all the resultant numbers seem to make sense.
__________________
John & Diane, Fulltimers. RVM103 NHSO
On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
JFXG is offline   Reply With Quote
Old 10-07-2013, 11:33 PM   #9
Senior Member
 
Mr_D's Avatar
 
Country Coach Owners Club
Winnebago Owners Club
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,083
Aren't there several models of the Onan 7.5 in use? Aren't some variable rpm and others set rpm? The low rpm set ones will use less fuel.
Our 8Kw PowerTech uses .71 gph at full load and only .26 at 25%. It's powered by a 3 cyl Kubota running at 1800 rpm.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition
Mr_D is offline   Reply With Quote
Old 10-08-2013, 09:20 PM   #10
Senior Member
 
Cat320's Avatar
 
Fleetwood Owners Club
American Coach Owners Club
Join Date: Mar 2011
Posts: 5,820
As a last resort I looked in the manual for my 8 KW Onan, here's what it said:

No load: .13 GPH.
Half load: .5 GPH.
Full load: 1 GPH.
__________________
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
Cat320 is offline   Reply With Quote
Old 10-08-2013, 09:48 PM   #11
Member
 
evesely's Avatar
 
Fleetwood Owners Club
Join Date: Sep 2012
Location: Duncan,SC
Posts: 99
Consumption will be aprox. 1/2 to 1 Gal per hr. Depending on load on the Genset.
evesely is offline   Reply With Quote
Old 10-08-2013, 10:38 PM   #12
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 21,258
Quote:
Originally Posted by Mr_D View Post
Aren't there several models of the Onan 7.5 in use? Aren't some variable rpm and others set rpm? The low rpm set ones will use less fuel.
Our 8Kw PowerTech uses .71 gph at full load and only .26 at 25%. It's powered by a 3 cyl Kubota running at 1800 rpm.
Mine is a 2000 model and is variable-speed.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 10-08-2013, 10:47 PM   #13
Senior Member
 
CampDaven's Avatar


 
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,438
Blog Entries: 1
Fill the tank.
Drive to park/home noting miles driven and average MPG.
Run the genny overnight with average load.
Go fill the tank (miles, avg MPG, yadda-yadda)
Press fingers to calculator.
It will be a fair guess.
;-)

Best wishes!
__________________
Dave and Nola, RVM1
The Journey is Our Destination!

https://davenola.blogspot.com/
CampDaven is offline   Reply With Quote
Old 10-08-2013, 11:36 PM   #14
Senior Member
 
dsbear's Avatar
 
Join Date: Jan 2013
Posts: 636
Ran my onan 8kw for 8 straight days under heavy load (ACs set 70 in Texas summer heat) and used 65 gals. equals .33 gals/hr
dsbear is offline   Reply With Quote
Reply

Tags
fuel, generator



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel consumption with CAT C12 2003 olyshed Country Coach Owners Forum 10 09-13-2013 10:32 PM
Practical life of class A R F S Class A Motorhome Discussions 26 06-23-2013 10:33 AM
DEF Consumption Rate gMw Cummins Engines 19 06-12-2013 03:16 PM


All times are GMT -6. The time now is 11:43 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.