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Discussion Starter #1
I special ordered my new Ram Promaster 1500 with high roof in sandstone color with the options I wanted. It should be ready for delivery around the first of the year. I have 5 show dog golden retrievers and travel all over FL with them so I want to add a Coleman Mach 8 low profile roof a/c, and a new Onan Series RV QG 2.8 generator to run it.
Question: Where can I safely mount the generator? Is there room underneath to mount it? I really prefer to mount it inside within a firebox maybe behind the rear wheel well??? Since they are building my promaster now is there anything I can have the dealer have them add to make after market generator mounting easier? Any ideas or suggestions please.
 

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If it was me having owned all 3 fuel types of Onan RV gensets over time, I'd go with a Honda or Yamaha instead. Much, much quieter and smoother running, and will use less fuel.
Now having said that, you know the Promaster comes with a second fuel tap on the fuel tank just for this purpose, so that should be an easy setup.
Winnebago is building class B RV's on the Promaster with the Onan genset, but no body has seen one yet out in the field.
You can buy lockable generator boxes that sit outside the vehicle and can be mounted on a trailer hitch type setup to hold them while running.
Good luck on this
 

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.....cut......

Question: Where can I safely mount the generator? Is there room underneath to mount it? I really prefer to mount it inside within a firebox maybe behind the rear wheel well??? Since they are building my promaster now is there anything I can have the dealer have them add to make after market generator mounting easier? Any ideas or suggestions please.
I doubt there is anything the factory can do to prep your PM's body so you can install a generator inside the van. To me that just seems too custom for a manufacturer to do on an assembly line unless it was already an option. Having said that I'd ask anyway since their is nothing to lose.

I would look at the Winnebago Travato as soon as they reach dealers to see how the generator is mounted. I would also ask, or see, if Winnebago is using a new lower-profile generator if mounted under the floor. A standard Onan generator mounted under a floor that is only 21 inches high doesn't leave much ground clearance.

The main difference between a Travato and your van is that the Travato is an extended model with greater overhang behind the rear axle. I think it's around an extra 14 inches or so. If the Travato's generator is mounted at the very back, it's possible the same can't be duplicated with your van. Having stated that, I expect the Travato generator to be closer to the front since the van's gas tank is under the front seats and it has to supply the generator.

Good luck and let us know what you find out because many of us will likely be doing the same.
 

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By the way, after looking at some pictures of the Travato prototypes that have been displayed at shows, it seems the generator is located at the front as I expected. The generator's exhaust pipe can be seen clearly coming out from under van just behind the driver's door. It looks too small to be the van's engine exhaust, so it's most likely the generator's.

http://www.lichtsinn.com/Blog/image.axd?picture=2013/4/DSC00278.jpg
 

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Discussion Starter #5
Onan generator installed on PM

Onan just came out with a new 2.8 microlite generator that is only 12.8" high x 22"L X 16.3"W. It will have enough power to run the 13,500 BTU a/c that I want to get with power to spare. I actually have a Honda 3000 EU "portable" generator that I was originally going to mount on a trailer tray in the back but that is a pain in the neck because I would have to refuel it myself and also worry about it being stolen even if in a lock box. This new onan passes state park noise restrictions and will be quiet enough to be parked at dog shows and keep my goldens comfortable.
I'll keep you guys posted on what I find out. Thanks so much for your input!
 

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Just purchased a Winnebago TREND. It uses the Promaster 3500 chases and the chases is extended so that the coach is 23 feet long. The Onan 2800 is located between the frame rails and just behind the rear wheels. Make sure that you tap into the fuel return line from the engine to the tank. Use a regulator to drop down the fuel pressure when the engine and generator are running. Also; using the fuel return ling will prevent the generator from running the tank dry.
Bob
 

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i dont know much about mounting generators in the back but id assume you would want an air tight box so noise doesnt get in. and of course have exhaust ports.
 

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i dont know much about mounting generators in the back but id assume you would want an air tight box so noise doesnt get in. and of course have exhaust ports.
The Trend I saw at RV show had generator mounted under the coach's floor, so it was wide open and able to vent for cooling. The exhaust exited from under the floor at the very back side on driver's side. Was typical of many RVs, particularly Van-based Class Bs that mount generator where spare tire normally goes.

A possible issue with mounting generator under PM van is that floor appears much lower than in a Trend. A Travato should give a great illustration of clearances.
 

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To kcudak--

What happened with your project?? I am thinking about buying a Promaster for my dogs as well, and am having trouble finding anyone that says they can mount a generator on the Promaster.. They say it's too low....do you have any photos??

Thanks
 

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Onan just came out with a new 2.8 microlite generator that is only 12.8" high x 22"L X 16.3"W. It will have enough power to run the 13,500 BTU a/c that I want to get with power to spare. I actually have a Honda 3000 EU "portable" generator that I was originally going to mount on a trailer tray in the back but that is a pain in the neck because I would have to refuel it myself and also worry about it being stolen even if in a lock box. This new onan passes state park noise restrictions and will be quiet enough to be parked at dog shows and keep my goldens comfortable.
I'll keep you guys posted on what I find out. Thanks so much for your input!
does anyone know if is there a way to have a built in generator to run an a/c and heater or is there an ac unit that works as a heater also or it is better to have a real furnace that runs on like propane--i'm looking for an easy way to heat and cool the promaster and keep it simple and basically an open format inside for various functions like camping and also hauling stuff or just have it empty most of the time but be able to keep it cool and warm if I need to thanks jay
 

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does anyone know if is there a way to have a built in generator to run an a/c and heater or is there an ac unit that works as a heater also or it is better to have a real furnace that runs on like propane--i'm looking for an easy way to heat and cool the promaster and keep it simple and basically an open format inside for various functions like camping and also hauling stuff or just have it empty most of the time but be able to keep it cool and warm if I need to thanks jay
If you have electrical power, from either a generator or shore power, you have many options for heating that don't require propane or a furnace. RV air conditioners can be purchased as heat pumps, and they can also be purchased with integral heat strip. Also, if you have a simpler AC (AC only), a portable electrical heater can keep a van comfortable. A 2800 watt generator should be able to run most options that are sized for a van.
 

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Hi jay massachusetts

After much research, I just ordered a 136WB low roof that I will be using as a dog transport/overnight hotel substitute. I am actually having a conversion company do the electrical and install of Onan generator, roof mounted a/c and fan. The generator MAY have to be mounted where the spare tire is, but that was when I was looking at the 118WB. Might be more options for the 136 and 159. Also including a shore power connection at the suggestion of the installer--makes a lot of sense.

Good luck!
 

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installed an onan 7k

I successfully mounted a big onan 7000 at the spare tire location. Basically I cut the floor out at the intake and exhaust ports, hooked up fuel line to aux fuel port, and it fired right up!
 

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I successfully mounted a big onan 7000 at the spare tire location. Basically I cut the floor out at the intake and exhaust ports, hooked up fuel line to aux fuel port, and it fired right up!
Ryan,

Not sure how you mounted it. Is the Generator IN the van or UNDER it? Trying to figure out why you "cut the floor out"

Thanks,
Ed
 

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If you have electrical power, from either a generator or shore power, you have many options for heating that don't require propane or a furnace. RV air conditioners can be purchased as heat pumps, and they can also be purchased with integral heat strip. Also, if you have a simpler AC (AC only), a portable electrical heater can keep a van comfortable. A 2800 watt generator should be able to run most options that are sized for a van.
Chance, need your opinion. Will be installing Coleman Mach Polar Cub rooftop AC with heatstrip on my 2500 high-top ProMaster. Not going to install any water pumps/heaters nor any 12V stuff. Will have 120V household electrical plugs for kitchen, computer and tech stuff, plus 2 ceiling lights (fluourescent, household current, no 12V lighting) at campgrounds with 30amp 120V electricty. Not going to have need for a generator nor 12V hookups while boondocking, will be roughing it for up to a week or so until I get to a "real" campground with electricity during my travels. What's the basic no-frills no-excessive type electrical distribution box panel I should put in my van for shore power hook-ups?
 

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Chance, need your opinion. Will be installing Coleman Mach Polar Cub rooftop AC with heatstrip on my 2500 high-top ProMaster. Not going to install any water pumps/heaters nor any 12V stuff. Will have 120V household electrical plugs for kitchen, computer and tech stuff, plus 2 ceiling lights (fluourescent, household current, no 12V lighting) at campgrounds with 30amp 120V electricty. Not going to have need for a generator nor 12V hookups while boondocking, will be roughing it for up to a week or so until I get to a "real" campground with electricity during my travels. What's the basic no-frills no-excessive type electrical distribution box panel I should put in my van for shore power hook-ups?
I'm not an electrician, or electrical engineer, so can only give you my opinion based on what I did on my present van.

My existing van is very simple and very much like what you describe above. Unlike my previous RV, a Class C, I don't presently have a generator, transfer switch, converter, etc. I wired the 120 Volt circuits similar to a house. I used a small non-metallic GE load center with 4 circuits, using a 30-Amp main and 15-Amp branches for the air conditioner, microwave, and 15-A "household electrical plugs".

We use the van mostly to travel long distances, and normally stay in campgrounds with full hookups. It's been working without issues for about 9 years now. At the time I looked for RV-specific load centers but could not find one for what I needed that also didn't include features I didn't need or want. It ended up very inexpensive although that wasn't my primary goal.

By the way, my AC runs OK off a 15-A circuit, but if you have a large AC or high-capacity heat strip, it may need a 20-A circuit. I'm not sure of power requirements.
 

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Will be camping similar to you guys. You confirmed my choice of panel box for my minimalistic lifestyle on the road, also confirmed by Paul at Sportsmobile in Austin, TX. A Square D model QO2L30S, only 7" by 4" by 3" deep, and will get a 20/30 circuit breaker, 20 for AC unit and 30 for all the other things.
http://www.grainger.com/product/SQUARE-D-Load-Center-5B755?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/5B755_AS01%3f$smthumb$
 
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