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 01-24-2011, 04:26 PM   #1
Senior Member
 
fletch460's Avatar
 
Join Date: Sep 2010
Location: Groves,TX
Posts: 370
Generator or Engine A/C?

I read somewhere it is better economy to run the genset down the road then to use the engine a/c. Manual says genset burns .6 gal. with a/c running. That computes to about four miles of driving. Would engine be pulled down more? I understand less load is more power for running. If this can't be answered here it cant be. Any thoughts here?
__________________

__________________
fletch460 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 01-24-2011, 07:21 PM   #2
Senior Member
 
94-Newmar's Avatar
 
Join Date: Nov 2009
Posts: 2,043
You don't mention gas or diesel, might want to put your rig's details in your signature line for future posts

That being said, I take issue with the .6 gal/hr on the fuel consumption IF you're talking diesel gensets. Not just on your post, but others I've on this and other forums.

Im a fanatic on figuring fuel mileage. I never let it go under 1/2 tank at any time (500 miles), and i know from that point it takes 50 gals to fill it back up. My tank holds 100 gal and I know i get between 9.4 and 10mpg depending upon grade, speed and wind. We once camped a whole weekend on generator only. The grounds we camped on were 2 miles off the interstate and i filled up at the exit. We ran the generator the entire weekend, never shut off from Friday afternoon until Sunday afternoon - both AC's (85 degree days), most all the lights, 2 LCD TVs, DirecTV and normal microwave oven usage. Before we hit the upon leaving I topped off again - it only took 15 gallons. In my book thats only .3 gal/hr. Before I started paying attention I always thought my Cummins/Onan 7.5K did really really well on fuel consumption. Mine is obviously an older type, not the newer inverter type... perhaps the older ones do better on fuel consumption.
__________________

__________________
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
94-Newmar is offline   Reply With Quote
Old 01-24-2011, 07:30 PM   #3
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,325
To me it is a comfort factor not a cost factor. If the dash air will not cool the coach I use the generator and A/C. If it is hot outside I do prefer to get to a campground with a cool interior. Sometimes it seems to take forever to cool the RV with the "house" air conditioner when arriving hot in a campground. (If mama's not happy no ones happy)
__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Old 01-24-2011, 10:53 PM   #4
Senior Member
 
fletch460's Avatar
 
Join Date: Sep 2010
Location: Groves,TX
Posts: 370
Sorry I didnt mention rig. It is gas and engine is 460 ford. I got the .6 gal out of the onan book. It is in old,94 model, class c-. The genny is only a 4000 watt. I feel like I am running around in a toy compared to some of your rigs. Not mad just envious. Maybe I should rethink about comfort vs. economy. I will put specs in signature as soon as I learn how. I appreciate the input and take it to heart.
__________________
fletch460 is offline   Reply With Quote
Old 01-25-2011, 06:54 AM   #5
Registered User


 
Monaco Owners Club
Join Date: May 2009
Posts: 3,198
The dash air in our Pace Arrow f53 easily cools the entire coach in any weather.
__________________
JimM68 is offline   Reply With Quote
Old 01-25-2011, 07:44 AM   #6
Senior Member
 
denochs's Avatar
 
Fleetwood Owners Club
Join Date: Oct 2009
Location: North Carolina
Posts: 702
There is an obvious difference when comparing a 4K gas & diesel gen set. Diesel is more efficient. However, it comes down to size and load. Our 10K diesel genny uses close to 1 gph when running all 3 A/C units and less when running one.

I found this to be the same on my 5K gas genny at home. When put under load you can hear the engine labor if the load is heavy enough.

In my opinion it comes down to comfort. Our dash A/C doesn't do much for us in 85+ degree weather.

Dave
__________________
David & Gail Salisbury, NC
2003 American Eagle 42'
denochs is offline   Reply With Quote
Old 01-25-2011, 07:50 AM   #7
Senior Member
 
powderman's Avatar
 
Join Date: Mar 2010
Location: N. E. Ohio & Lady Lake Fl.
Posts: 889
At idle before there is any load on the engine, the 5.9 Cummins burns about 1 gal per hour. Much more sense if parked to run the gen set. If going down the road, who knows??
__________________
powderman is online now   Reply With Quote
Old 01-25-2011, 07:59 AM   #8
Senior Member
 
Join Date: Oct 2005
Posts: 1,060
My dash air hasn't worked in five years so I usually use the genny.
__________________
bldrbob is offline   Reply With Quote
Old 01-25-2011, 08:14 AM   #9
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,322
I'm with 1ciderdog. For me the cost factor is not even in the decision process. What ever works for the passengers (wife, Gkids and a set or two of parents) is how the decision is made.

When the coach HVAC is active, I may also be running the automotive HVAC. As the driver, in front of the large slide wall, I need to be comfortable too.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 01-27-2011, 10:21 PM   #10
Senior Member
 
B Bob's Avatar
 
Join Date: Sep 2010
Posts: 1,162
If the dash air does the job that is what I would use. If it gets too hot inside with only dash air then turn on the genny and roof air. The you can turn off the dash air. From what I have been told dash air on a gas motor like yours pulls 4-6 hp. My guess would be that running dash air is cheaper than genny running.
__________________
B Bob
Country Coach 42' Affinity
2013 Jeep Wrangler Unlimited
B Bob is offline   Reply With Quote
Old 01-28-2011, 01:08 PM   #11
Senior Member
 
HMXDave's Avatar
 
Newmar Owners Club
Join Date: Feb 2010
Location: Central Alberta, Canada
Posts: 245
Top Gear did a episode where one guy was running with no AC and the other ran with it on...the mileage difference was not appreciable. Granted, these are sports cars...but I'd say running the dash AC doesn't affect the mileage much on a unit with a huge motor pulling heavy loads anyways.
__________________
Dave and Kara - Weekend Warriors 2010 Newmar Bay star 3202, Ford chassis, Ford Ranger Toad, Can Am ATV
Central Alberta, Canada
HMXDave is offline   Reply With Quote
Old 01-28-2011, 01:16 PM   #12
Senior Member
 
94-Newmar's Avatar
 
Join Date: Nov 2009
Posts: 2,043
I didnt see that on Top Gear but instead on Mythbusters. They didn't test with the AC on versus Off per se, they instead tested AC on with windows rolled up versus AC off with windows rolled down. Their findings showed that a vehicle with the windows down suffered an appreciable decrease in fuel mileage due to the increased wind resistance and drag of the wind cavitating inside the passenger compartment.
__________________
94-Newmar Kountry Star 40-KSDP
Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
94-Newmar is offline   Reply With Quote
Old 01-28-2011, 01:29 PM   #13
Senior Member
 
Tha_Rooster's Avatar
 
Join Date: Aug 2008
Location: Georgia
Posts: 4,516
If the suns shining bright and hot I'll run both to keep me and family cool so if you burn as much as 1gal an hour it's worth it for me.
__________________
2007 Fleetwood Revolution LE 40V
Tha_Rooster is online now   Reply With Quote
Old 01-28-2011, 01:44 PM   #14
Senior Member
 
akadeadeye's Avatar
 
Join Date: Jul 2009
Location: Boerne, Texas
Posts: 1,383
Quote:
Originally Posted by fletch460 View Post
Sorry I didnt mention rig. It is gas and engine is 460 ford. I got the .6 gal out of the onan book. It is in old,94 model, class c-. The genny is only a 4000 watt. I feel like I am running around in a toy compared to some of your rigs. Not mad just envious. Maybe I should rethink about comfort vs. economy. I will put specs in signature as soon as I learn how. I appreciate the input and take it to heart.
Fletch,

Go to User CP (upper left screen), then find Edit Signature in the left column, then fill in the blank and click Save Signature

Don
__________________

__________________
2009 Newmar 42 ft. Allstar 4188, Wheelchair Accessible, 400HP Cummins ISL, Allison 3000, Mastertow Dolly, '98 Riviera
akadeadeye is offline   Reply With Quote
Reply



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
New A/C Unit Compatability With Old (1996) Intellitec Control System tomnorman457 MH-General Discussions & Problems 3 10-05-2010 01:16 PM
Front a/c runs in fan position and stops on a/c position Wanabee FTer MH-General Discussions & Problems 2 09-29-2010 12:19 PM
Summer Ready Basement A/C Pubtym Winnebago Industries Owner's Forum 16 07-26-2010 03:28 PM
Kit Camper Projects - Project #7, Installing a Household A/C Unit RedneckExpress Vintage RV's 1 02-03-2008 09:18 PM
"Summer Ready" Basement A/C Pubtym Winnebago Industries Owner's Forum 7 06-30-2007 09:43 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:52 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.