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Old 10-09-2021, 05:27 AM   #1
snowmanfx4
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Onan generator

I have a new 3931fb with generator prep and the in command. Cummins dealer here got my new onan in and I'm going to have the install it.
My question is. Its going to run on LP. Does it have to have its own regulator or can it just use the one on the LP tank?
They are telling me it will take 18 hrs to install it.
 
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Old 10-09-2021, 07:47 AM   #2
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18 hours and you have the generator prep? Friend had one of these he said the 30lb tanks ran out to quickly with both A/C`s running and changed them out for 40 lb tanks. A little heavy to lift in place and had to lower the seat the bottles sat on a little. I asked him he said it ran off the campers regulator and was satisfied how it powered the camper. 18 hours huh.
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Old 10-09-2021, 11:25 AM   #3
432bartman
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Holy cow 18 hours......sounds like the factory "Prep" could use more prepping.
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Old 10-09-2021, 11:28 AM   #4
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These Onan or any generator likes or should I say loves propane.
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Old 10-09-2021, 12:16 PM   #5
ctwebb
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We run our Onan on propane with one A.C . One 40 Lb bottle last us at least 12 hours.
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Old 10-09-2021, 01:56 PM   #6
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That's why I like my Onan gas generator. Have 3 gal marine tank in frame of rig. If boon docking, I have a 6 gallon marine tank and a 6 gallon gas tote. Easier to find and transport gas than propane.
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Old 10-09-2021, 02:30 PM   #7
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I have 2 4500 watt gens in the back of the truck to run both gens if I need to and any thing else I want to run at the same time. I must admit they do suck a lot of propane running. But what price comfort, besides it keeps the wife happy and we all know the benefits of that.
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Old 10-09-2021, 03:48 PM   #8
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I don't think that is even takes 18 hours to build a Montana.
I would ask for an itemized list of the cost on that 18 hour job. The hardest part of the job is getting the Onan into the front storage, the rest is simple hookups.
I would guess it shouldn't take more than a half day at most, unless they're building the Onan for a DIY kit.
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Old 10-09-2021, 08:13 PM   #9
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The reason a generator uses so much propane is it has 91,000 BTUs per gallon and gasoline has 116,000. So to accomplish the same as a gasoline unit it must burn more fuel.
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Old 10-09-2021, 09:33 PM   #10
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I could see 18 hours if they had to construct the metal enclosure that the generator resides in within the enclosure, maybe. If it is gen ready that enclosure should already be in place along with the wiring and start switch.
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Old 10-13-2021, 03:04 PM   #11
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More suggestions

1- Recalculate your pin weight. That generator will add just under 300 lbs.
1-2 The Onan 5500 ingests and exhausts cooling/heated air below itself. This results in hot air being ingested back into the cooling intake. In warmer climates, the generator runs very hot due to re-ingesting the heated air into the cooling side. In each of my past generators, I had my metal shop build an elbow which channeled the hot air to the driverís side of the camper. My present 2019 3700FL, came with a factory installed Onan 5500 (sold it). I removed the containment shroud and installed 560 amp hours of Lithium batteries, which serves more than 90% of the time. When ac is anticipated, 1 or two Honda 2200ís (which is rare) keeps things cool. The 640 watts of panels have proven more than adequate to keep the 12 volts topped off by noon each day. The weight saved and storage area reclaimed was worth the effort.
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Old 10-13-2021, 04:35 PM   #12
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I went with the 6500lp slightly more efficient l, worth the extra cost? Who knows but I like having the extra power. At some point I want to remove one of the propane tanks and switch it over to gas like some did here. The wife was a little nervous about that so I just went propane for now.

I was not gen prepped and installed everything myself in 1/2 the time. 18 hours is ridiculous


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Old 10-13-2021, 07:39 PM   #13
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I installed the generator. Didn't take to Cummins. Did it in 7 hrs.
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Old 10-13-2021, 07:43 PM   #14
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Quote:
Originally Posted by firestation12 View Post
1- Recalculate your pin weight. That generator will add just under 300 lbs.
1-2 The Onan 5500 ingests and exhausts cooling/heated air below itself. This results in hot air being ingested back into the cooling intake. In warmer climates, the generator runs very hot due to re-ingesting the heated air into the cooling side. In each of my past generators, I had my metal shop build an elbow which channeled the hot air to the driverís side of the camper. My present 2019 3700FL, came with a factory installed Onan 5500 (sold it). I removed the containment shroud and installed 560 amp hours of Lithium batteries, which serves more than 90% of the time. When ac is anticipated, 1 or two Honda 2200ís (which is rare) keeps things cool. The 640 watts of panels have proven more than adequate to keep the 12 volts topped off by noon each day. The weight saved and storage area reclaimed was worth the effort.
You have any pictures what you guy did to your generator area?
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Old 10-13-2021, 08:13 PM   #15
firestation12
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Generator compartment

Quote:
Originally Posted by snowmanfx4 View Post
You have any pictures what you guy did to your generator area?

Removing the generator containment shroud created a full width storage area in the front overhang of the 5th wheel. The picture where the solar battery group resides, occupies less than 1/4 of the front storage. The batteries were formally under the hydraulic pump located on the RF compartment, which now is used for fresh water hose.
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Old 10-13-2021, 10:38 PM   #16
pitman44
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Quote:
Originally Posted by snowmanfx4 View Post
I installed the generator. Didn't take to Cummins. Did it in 7 hrs.
Did the generator come with all the parts and pieces needed to install it? I'm assuming you started with a gen prepped RV.
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Old 10-14-2021, 03:54 AM   #17
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Quote:
Originally Posted by pitman44 View Post
Did the generator come with all the parts and pieces needed to install it? I'm assuming you started with a gen prepped RV.
Yes everything came with the generator. And yes the new rv came generator prep, sort of. The generator sat on a heavy frame. There is a heavy tin floor below in about 5 inching that we had to cut holes in so we could bolt it down. Bigger hole to get to the oil filter. Used a hole saw. And a hole for the exhaust pipe. After 7 hrs it was done.
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Old 10-15-2021, 12:30 PM   #18
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Propane

I love the propane generator Onan 5500. No carrying extra gas, no smell, no winterizing.
I carry extra tanks for my propane firepit. Havent needed to use yet.. my trips haven't been longer than 4-5 summer days.will last 2 trips. will run a few hours a day to charge.. It might be more expensive but these outweighs negatives for me.
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Old 10-15-2021, 01:45 PM   #19
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Thanks
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