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Old 12-06-2017, 12:54 AM   #21
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As mentioned in another thread, we put a muffler (ahem, exhaust resonator) on our Onan and it cut the sound by about half. Cost of resonator and installation, including welding, was under $100.
Half is still loud to my ears in a wilderness wonderland, but more importantly, many campgrounds still have restrictions on generator use in either when you can run them or just not at all. The more desirable campgrounds, IMO, have the most restrictions. hbn7hj said it best, truck stops where everyone else is adding to the cacophony of sounds is the best area to run a generator.
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Old 12-06-2017, 01:26 PM   #22
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Traveling cross country in the summer (not by choice but it happens) is the only time I need A/C with the Onan. ...
For those of us who live in the deep south, this is a necessary evil. We are forced to traverse the south in its entirety in order to reach cooler destinations.

What I find is that the overnight temps usually become bearable BUT the van is not even briefly habitable as long as the sun is still up. And during high summer, the sun won't set until 8:30 pm or maybe later. So I might pull off the road for the day at 7:30 pm and then run the Onan and a/c combo for one hour, then shut it all down and turn on the Fantastic with the windows open. It's hot overnight, but I can live with it.

Given that we have a lithium system, I can also run the coach a/c off batteries for 1 to 2 hours each day (it requires an EasyStart to be installed). I do this during my driving lunch break, which allows me to take an all-important nap. I know that I'll be getting back on the road for numerous more hours of driving following the nap, so running the batteries down at noon is not a big deal.

Someone may be wondering "Why not just run the Onan at noon, too?" Try doing that in the parking lot of a Subway sandwich shop or similar eatery. It wouldn't go over well - that's the kind of behavior that gives long-distance van voyagers a bad name. And it's too difficult to find secluded areas while on the road for running the generator. Best to just switch to battery power.
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Old 12-06-2017, 02:41 PM   #23
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Jury is still out because Advanced RV is still testing the 48v Volta system in one of their vans and I haven't heard an update. But with the Volta system and a new air conditioner 20% more energy efficient and quieter than the Coleman Mach 8 they've been using, they may achieve a true off the grid Class B van with air conditioning as needed. They do more extensive insulation of their van than any other converter I know of. That helps. They've been responding with their efforts for some southwest customers and their direct experience.
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Old 12-06-2017, 05:11 PM   #24
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As mentioned in another thread, we put a muffler (ahem, exhaust resonator) on our Onan and it cut the sound by about half. Cost of resonator and installation, including welding, was under $100.
I installed a good muffler as well on our LPG powered Onan, it reduced the noise considerably, the built-in muffler is a joke. The generator was mounted on the RV trailer. In addition to the muffler I used a 3’ x 3’ of egg crate foam under the generator to cut down reflected sound from a hard surface, the reduction wasn’t big but noticeable.
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Old 12-06-2017, 10:10 PM   #25
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Traveling cross country in the summer (not by choice but it happens) is the only time I need A/C with the Onan. Parking out of the way in a truck stop I get a good night's sleep with the Onan running, the A/C on, and the CO alarm on. Finding shore power late in the day sometimes works and if it does, I use it.

Not having all night A/C available is not acceptable. I don't use it much but I do use it. The expense of any other option is incredible, even if it worked.
Harry
If you have a gas engine you can also idle the van engine all night with the dash AC. It will use about the same amount of fuel.
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Old Yesterday, 11:02 PM   #26
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I have 400ah of lithium and a diesel webasto dual top for forced air and hot water in my custom built promaster. The diesel (I actually run kerosene to help with the health of the dual top as I can run diesel, kerosene or Jet Fuel A) is in an secondary tank so it's not the single source van I was after (I purchased the van already built), but it works great but is a little noisy when you first start and shut down but no where near as noisy as an onan and you can only really hear it on the inside as it's installed inside the van.

I've never really taken count of how much fuel it uses, but it SIPS fuel! Very efficient.

I used the lithium to cook on my induction plate and microwave. I also boil water quickly with a small electric kettle. If I were to build my own van, I would go the same route but buy a Diesel Promaster so I don't need a second fuel source. My fear with Propane is finding it in the middle of no where. I can carry extra kerosene in my storage area with no problems.

My van DOES NOT have AC, so if that's required, you're going to need more lithium that you can probably fit in a van. Yes it can be done, but I think you might be better off having the AC installed, but only use it when you are connected to shore power.
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Old Yesterday, 11:15 PM   #27
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Several have said it. The bottom line is if you need A/C, off grid, in a class B for any length of time you need a built in Onan 2.8kw generator. Those of you looking to purchase a class B need to keep that in mind.
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Old Yesterday, 11:46 PM   #28
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Several have said it. The bottom line is if you need A/C, off grid, in a class B for any length of time you need a built in Onan 2.8kw generator. Those of you looking to purchase a class B need to keep that in mind.
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Old Today, 12:10 AM   #29
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Several have said it. The bottom line is if you need A/C, off grid, in a class B for any length of time you need a built in Onan 2.8kw generator. Those of you looking to purchase a class B need to keep that in mind.
Harry
I do have to remind you again that there is another way. An idling gas engine running the dash AC will use about the same amount of fuel as an Onan.

And it is quieter than an Onan.

I see no situation where you NEED an onan.
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Old Today, 12:31 AM   #30
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I do have to remind you again that there is another way. An idling gas engine running the dash AC will use about the same amount of fuel as an Onan.

And it is quieter than an Onan.

I see no situation where you NEED an onan.
I would agree on idling engine being quieter, etc, but if you have a diesel, you can't let it run indefinitely like a generator can. Personally, I would be thrilled about idling our gas van all night or day either, though.
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