Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-22-2016, 05:58 AM   #1
Senior Member
 
Join Date: Jan 2016
Posts: 309
5.5 or 6.5 Onan

Need some input. I'm going to add an Onan to a 2015 GK. The unit has 2-ACs with heat pump/ residential fridge / induction cook top / fireplace / dishwasher / washer - dryer. These are the big electricity consumers. Does anyone out there have a 5.5 and feels at times it just is not keeping up when you are in a full demand load. Onan of Elkahrt suggests any coach over 36' needs a 6.5 and especially a unit that is classified as a full time unit. The different in cost is about $880-$1000 more. They are the same size and the same weight. the only difference is the consumption of gas. Any input would be a help as I want to do it wright the first time.
Here is a second part. Seeing as the truck is a diesel would you install an LP or Diesel. And run a connection from the truck.
Thanks
__________________
Meet Teddy Bear
Make Every Day Count
2016 Denali 3500 Diesel SRW
2015 38 GK
Cheryl & Wayne
ted 95 is offline   Reply With Quote
Old 04-22-2016, 12:18 PM   #2
Member
 
Join Date: Nov 2015
Posts: 62
Personally, I'd go with the 6.5. I have the 5.5 LP version and it will trip a generator breaker when both A/Cs kick in at the same time, but otherwise the 5.5 does fine.

If you are traveling, how would you get the diesel supply? I would think the only choice for a non-toy hauler is LP. I did switch my 30# LPs to 40# cylinders, LP does go fast. (I miss my toy-hauler with the 60 gallons of gas for my old Onan 5.5 gas generator. But at least you won't have to worry about stale fuel with the LP)
gford10480 is offline   Reply With Quote
Old 04-22-2016, 03:57 PM   #3
Site Team
 
Dave&Ginny's Avatar
 
Join Date: Jan 2012
Posts: 5,379
I had the 5.5 and it did everything I needed it to do. With that said.....if you could run a diesel generator in the bed of your truck (off the trucks fuel tank), I think that could be a very effective setup. That way you wouldn't have to contend with the LP and the diesel fuel wouldn't get stale from lack of use.
__________________
SOB "The RV Wiseguy"
Dave&Ginny is offline   Reply With Quote
Old 04-22-2016, 06:40 PM   #4
Senior Member
 
Join Date: Aug 2015
Posts: 392
I haven't added a generator yet. But I am in the process of adding an auxiliary fuel tank to the truck. I will have almost 90 gallons. My plan then is to get a diesel generator, ether portable or in the RW.

I much rather have to find diesel then LP. From what I read on these posts, the generator goes through the LP quickly.

One more thought, before I get the generator, I am trying to decide if I spend the same amount of money on batteries and solar if that would be a better option. Knowing full well that I wouldn't be able to run the AC's on that set up. But then, most nights in many areas get cool enough.

Lithium batteries are starting to come down in price. So may questions.
__________________
Scott
2015 38GK, Titan Brakes, H 114 Tires, IS
2015 Denali Dually
bergeman is offline   Reply With Quote
Old 04-22-2016, 07:30 PM   #5
Member
 
Join Date: Nov 2015
Posts: 62
Just as an fyi, there is apparently an option on the Onan generators to have 30/30 Amp breakers; mine are 30/20 and the 20 amp is the one that throws when both A/Cs start up at the same time; but I have learned to wait for a few minutes before turning the other one on.
gford10480 is offline   Reply With Quote
Old 04-22-2016, 11:43 PM   #6
Senior Member
 
Join Date: Oct 2014
Posts: 106
My rig was pre wired for a generator and I had the dealer install the Onan when I made the original purchase. They said the factory would only allow the installation the 5.5 LP. It works fine. I don't have a washer/dryer but everything else and use the generator often when we stop for lunch. Never a problem.
__________________
2015 Carriage RL40, Residential Fridge, Onan 5.5KW
2014 Ram 3500 CTD, DRW, Aisin
bull_chips is offline   Reply With Quote
Old 04-23-2016, 12:09 AM   #7
Site Team
 
piper guy's Avatar
 
Join Date: Dec 2012
Posts: 1,819
Onan makes a 6500 Diesel generator that is the same size and footprint as the gas ones. It is around $7.4 k depending on source and is actually quite ran the gas one.
If I go to a gen set it will be either this one or one mounted in the truck with an umbilical cord to the coach. There is more than enough room to build a mount and put a 15-20 gal diesel tank above the gen.
__________________
Vaughan & Tracy 2013 RW 36RL, 2013 F350 DRW CC, 2016 Focus. MorRyde IS, MorRyde pinbox, disc brakes, Comfort Ride Hitch. "Life is to be embraced, Grab it with both arms ! "
piper guy is offline   Reply With Quote
Old 04-23-2016, 02:12 AM   #8
Senior Member
 
mhs4771's Avatar
 
Join Date: Jan 2012
Posts: 2,367
We have the 5.5 with the 30/30 breakers and have run both ACs without a problem. You have to really look at your big loads and guess how many you would ever have running at the same time.
__________________
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top
mhs4771 is offline   Reply With Quote
Old 04-23-2016, 03:11 AM   #9
Junior Member
 
Join Date: Mar 2016
Posts: 15
We have the 5.5 and last week during PDI, I turned on everything I could to test the generator capacity. Granted the weather wasn't overly warm, but the generator ran everything both A/C's, fireplace, microwave, every light, TV's plus moved the slides in and out. Assuming you turn the A/C's on independently, you shouldn't have a problem with the 5.5. The LP version is surprising quiet, not sure about the DB rating on the diesel version.
__________________
Kevin Harmon
KevinSonya Harmon is offline   Reply With Quote
Old 04-23-2016, 04:24 AM   #10
Senior Member
 
5th_Time's Avatar
 
Join Date: Mar 2012
Posts: 1,121
Ugh, picture how loud an Onan generator is in the bed of a truck with no exhaust - even with one! You need a generator when you can't plug in... like boondocking in state parks or beach campgrounds. Doesn't "sound" practical.
When Redwood OEMs only the LP version, that tells you something...
__________________
Mike & Pam '12 36RL, Kodiak Discs, 17.5" G114s H-Rated, SRE4000 w/HD Shackles, Joy Rider Shocks, Flex Air, 5.5 Onan, W&D, DW, 4 Scare Lights, (2) 6V Trojan T-145s; Progressive EMS-HW50C, Winegard DTV Sat, Sony/Denon 4K Home Theater, WiFiRanger EliteAC Pack, weBoost 4G-X Cell Booster.

2019 RAM 3500 Limited 8', CC, 4x4, DRW, Cummins HO, AISIN, 4.10, Curt A30 w/OEM Prep, Transfer Flow 70gal Aux Tank/Toolbox.
5th_Time is offline   Reply With Quote
Old 04-23-2016, 03:59 PM   #11
Senior Member
 
atom ant's Avatar
 
Join Date: Feb 2013
Posts: 7,101
Quote:
Originally Posted by gford10480 View Post
Just as an fyi, there is apparently an option on the Onan generators to have 30/30 Amp breakers; mine are 30/20 and the 20 amp is the one that throws when both A/Cs start up at the same time; but I have learned to wait for a few minutes before turning the other one on.
gford, try swapping the 20 and 30 circuits in the transfer panel. I have the 30/20 version and it has done fine running both ACs, as long as I shut off the HW tank electric, however when I first installed it in my Montana it initially would pop the 20 side. I had to rearrange some circuits on the bus, as they had both ACs on one side.
__________________
Brad & Dory - Lone Tree, CO
CURRENT - 2013 Itasca Meridian 42E/2013 Wrangler 4dr Sahara
SOLD - 2014 Redwood 36RL/2014 F350 DRW
atom ant is offline   Reply With Quote
Old 04-28-2016, 12:45 AM   #12
Senior Member
 
Join Date: Aug 2015
Posts: 392
Has anyone had any experience with Generac RV generators. Same style as Onan but half the price. I'm seeing a new diesel or or LP, 7500 watts under $3k.
Generac RV Generators

That's less then half the price of Onan.
__________________
Scott
2015 38GK, Titan Brakes, H 114 Tires, IS
2015 Denali Dually
bergeman is offline   Reply With Quote
Old 04-28-2016, 12:55 AM   #13
Senior Member
 
Blue Dogs's Avatar
 
Join Date: Apr 2014
Posts: 383
Quote:
Originally Posted by bergeman View Post
Has anyone had any experience with Generac RV generators. Same style as Onan but half the price. I'm seeing a new diesel or or LP, 7500 watts under $3k.
Generac RV Generators

That's less then half the price of Onan.
Had one in a camper, it was a 3K watt LPG ... if it was anything like the larger ones ... Run don't walk away! It was very difficult to keep running and super hard to find service for. FWIW, I will never own another.
__________________
Yale & Tammy
2014 F-350 4x4 crew cab, SRW, 6.7, 3.55's, 18K PullRite
2014 Redwood black and Gold 38RL, king slide in slide, 5.5 Onan
Blue Dogs is offline   Reply With Quote
Old 04-28-2016, 03:30 PM   #14
Member
 
dieseldave's Avatar
 
Join Date: Mar 2014
Posts: 38
Quote:
Originally Posted by Blue Dogs View Post
Had one in a camper, it was a 3K watt LPG ... if it was anything like the larger ones ... Run don't walk away! It was very difficult to keep running and super hard to find service for. FWIW, I will never own another.


I had the 7500 model in my last 5th wheel and had the same issues. Generac actually stopped making rv generators a couple of years back.
__________________
2013 38GK - Titan Disk Brakes, SRE4000
2016 F350 DRW
dieseldave is offline   Reply With Quote
Old 04-28-2016, 07:43 PM   #15
Senior Member
 
RCAircraft's Avatar
 
Join Date: Oct 2012
Posts: 412
Quote:
Originally Posted by ted 95 View Post
Need some input. I'm going to add an Onan to a 2015 GK. The unit has 2-ACs with heat pump/ residential fridge / induction cook top / fireplace / dishwasher / washer - dryer. These are the big electricity consumers. Does anyone out there have a 5.5 and feels at times it just is not keeping up when you are in a full demand load. Onan of Elkahrt suggests any coach over 36' needs a 6.5 and especially a unit that is classified as a full time unit. The different in cost is about $880-$1000 more. They are the same size and the same weight. the only difference is the consumption of gas. Any input would be a help as I want to do it wright the first time.
Here is a second part. Seeing as the truck is a diesel would you install an LP or Diesel. And run a connection from the truck.
Thanks
Doing the math on my rig, and applying the 80% rule I selected the 6.5 KW Onan Gold propane fueled which has a similar KW load as your RW. It's best to not fully load a gen set due to variables including high ambient temperatures.
__________________
Bob and Carol - Lees Summit, MO,
2016 Silverado 3500 HD, High Country DRW diesel, 3.73 gear ratio, long bed, 25K Reese Elite removable hitch with 2013 Redwood 36RL with 17.5" H-rated tires and MOR/ryde heavy duty shackle links and bushings; 6.5 KW gen
RCAircraft is offline   Reply With Quote
Old 02-10-2017, 04:52 PM   #16
Member
 
Join Date: Mar 2016
Posts: 69
I have a question for you sir? I am getting ready to purchase the 5.5 pretty quickly. My 13 36RE came with the factory prep for the generator, It has a wiring harness in the gen. compartment and the hour meter and start/stop inside the coach. Other than run the power cable to the battery and the fuel supply and the exhaust what else is there as far as installing myself? Any help would be greatly appreciated!!!
__________________
The Wirt's, Nelson, Annette, and Hank(our mini-pin)! 2013 36RE, 2010 F350 Power Stroke Dually.
nwirt74@gmail.com is offline   Reply With Quote
Old 02-10-2017, 05:16 PM   #17
Senior Member
 
Join Date: Jan 2016
Posts: 309
When i had mine installed at Onan in Elkhart they also installed an exhaust scoop / deflector. When i asked them what and why as i had never seen that on a rig before. the explanation was --
very often a gen will shut down for what you think is no reason on a hot summer day. the problem is the intake is sucking in the hot exhaust air and causing the gen to over with out the deflector. with the deflector it shoots the air to the road side.
and even more important you can cause a grass fire with the hot exhaust going straight down.
ive trried to post pics and just can't figure out how. if you pm me iwill send you a pic of the scoop.
also be sure your muffler pipe is no where near a window or opening to the unit.
__________________
Meet Teddy Bear
Make Every Day Count
2016 Denali 3500 Diesel SRW
2015 38 GK
Cheryl & Wayne
ted 95 is offline   Reply With Quote
Old 02-10-2017, 05:34 PM   #18
Senior Member
 
atom ant's Avatar
 
Join Date: Feb 2013
Posts: 7,101
Quote:
Originally Posted by nwirt74@gmail.com View Post
I have a question for you sir? I am getting ready to purchase the 5.5 pretty quickly. My 13 36RE came with the factory prep for the generator, It has a wiring harness in the gen. compartment and the hour meter and start/stop inside the coach. Other than run the power cable to the battery and the fuel supply and the exhaust what else is there as far as installing myself? Any help would be greatly appreciated!!!
You didn't mention the output power cable to the transfer switch. Other than that, I think you covered it. The exhaust is a real pain in the keester finding the right parts, as the local exhaust shops don't go as small as 1". It pretty much needs to be a kit from Onan or Redwood to get it to come out between the slides.

Teds air scoop sounds interesting. I didn't have it but I do know someone with the 6500 that had to do that because of overheat, especially with the Z-frame Redwood having the generator so close to the ground.
__________________
Brad & Dory - Lone Tree, CO
CURRENT - 2013 Itasca Meridian 42E/2013 Wrangler 4dr Sahara
SOLD - 2014 Redwood 36RL/2014 F350 DRW
atom ant is offline   Reply With Quote
Old 02-10-2017, 06:28 PM   #19
Senior Member
 
Ford truck guy's Avatar
 
Join Date: Jul 2015
Posts: 1,901
I also am very interested,,,, PM sent
__________________
2015 F-350
2020 3991RD with-
17.5 Goodyear 114's , Titan Disc brakes, MorRyde 8K IS, Onan 6.5..
Ford truck guy is online now   Reply With Quote
Old 02-11-2017, 03:25 AM   #20
Senior Member
 
Ford truck guy's Avatar
 
Join Date: Jul 2015
Posts: 1,901
Thanks for the email.... here are the pics - so it looks like it dumps the hot air to the street side of the trailer... I what are the dimensions?



__________________
2015 F-350
2020 3991RD with-
17.5 Goodyear 114's , Titan Disc brakes, MorRyde 8K IS, Onan 6.5..
Ford truck guy is online now   Reply With Quote
Reply


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


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Redwood RV or any of its affiliates. This is an independent, unofficial site.


All times are GMT +1. The time now is 07:47 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×