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Old 10-31-2020, 03:46 PM   #1
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Onan QD 7500 Replacement

I am exploring my options of deleting the Onan QD 7500. I am curious if anyone here has replaced their Onan with a smaller Honda (or other) unit in the same space? I am not excited to have a different fuel source but this QD 7500 keeps taking my money at the shop and I don't really need one this big. I have a Victron power assist inverter that will hopefully help with larger short run loads.

I am trying to test the feasibility of a different unit mounted in the same generator compartment. I was looking at the semi portable 3000-7000 watt units but not sure how comfortable I am with the aftermarket exhaust routing and unit mounting. Anyone here done this mod? My current unit is not on a slide so this is why my solution needs to be fixed and exhaust routed. I am not interested in carrying generators around and worrying about them walking away.
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Old 10-31-2020, 04:30 PM   #2
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Having any different fuel powered genset would be a non-starter for me. Is there any “smaller” alternative that would allow continued use of the fuel you already have onboard?
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Old 10-31-2020, 05:31 PM   #3
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You may not care about resale, but I think your coach would be impossible to sell with a gasoline generator in a diesel coach. Are you prepared to carry gasoline containers and refuel the generator regularly?
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Old 11-01-2020, 08:07 AM   #4
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Having any different fuel powered genset would be a non-starter for me. Is there any “smaller” alternative that would allow continued use of the fuel you already have onboard?

Me too.
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Old 11-01-2020, 08:12 AM   #5
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It's not a simple replacement and you seem to want something that is equivalent to your OEM installation but with [maybe] fewer watts. You probably need at least 4kw (assuming you want to run at least one a/c and some other stuff). If you are thinking you can drop in a $400 contractor genset and maybe spend another $400 retrofitting the installation, you are dreaming (unless maybe you can DIY)..
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Old 11-01-2020, 08:20 AM   #6
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….not familiar with the Victron product you mentioned but "replacing" the generator with solar involves a massive "investment" in panels and batteries….then you still have cloudy days and winter sun issues....non-std genset solutions will likely have challenges with wiring, proper exhaust venting, cooling and fuel storage.... we both own older coach so resale might not be as big an issue but a non-std or mixed fuel genset solution will really decrease opportunity for resale--IMHO.
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Old 11-01-2020, 01:46 PM   #7
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I'm thinking you'd obviously want to go with a propane instead of gasoline if giving up the diesel generator.

A gasoline generator, I have to think, would be out of the question. It's also a more expensive fuel (as in less efficient) and dirtier than propane ...and where are you going to install gas tanks or store the gasoline?

So I'm with others ...by the time you do all the retrofitting, no matter what option you might choose, my guess is that that cost would far outweigh the expense you currently have maintaining the Onan. I've heard that the QD 7500 can be relatively reliable if maintained properly. If you've neglected maintenance, then get caught up and diligently keep doing scheduled maintenance. I think you'll be money ahead.
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Old 11-01-2020, 03:47 PM   #8
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A lot of conclusions jumped to on this post and I guess since there was no answer to the original question, that must be my answer. I should have been more thorough in my original post but was trying to keep it brief.

For those that did reply that might have wanted more detail, I have an extensive solar and lithium battery setup with an inverter that has a shore assist function that would allow me to use a much smaller generator (which is why I was exploring alternatives). It is an advanced setup so not as common in the standard RV electrical delivery system. This current genset is way over scoped for this rigs newly installed electrical system and the generator prices grow significantly for that extra unnecessary 2-3kw.

This generator has been maintained to the book in my 7 years of ownership (I don't let anything go unmaintained). Regardless I have had to put $4k into it to date for new inverter board, fuel pump, etc. It cost almost a $1k just to drop the thing and put it back. And now we are back to a unit that will not run and has to be dropped again. I just want to explore my options before I get the diagnosis and a potentially fatal outcome.

No I really don't want to lug around gasoline. Propane would be a better option but would love a diesel alternative. I haven't had any luck finding one. This post was intended to see if anyone more creative than me has found an alternative. It doesn't appear so.
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Old 11-01-2020, 04:12 PM   #9
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TRYING to be helpful, not critical, but are you saying you cannot find ANY 4-5,000 KW genset with a diesel motor???
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Old 11-01-2020, 05:04 PM   #10
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You're correct, you didn't give us enough info, but now that you have, I still say you're in the same situation. PERSONALLY.....I think it's often crazy what people pay to put together a solar system to save a few dollars in fuel. I said earlier that your coach would be hard to sell without the original generator. At the same time, you'll also lose all the solar power money spent, on TOP of the lack of an original generator. You're actually doubling your losses. It's nice to say you have 2000 watts of solar, but at what cost and at what value. You could have probably repaired the generator correctly, for what you spent on solar, burned diesel fuel and still be ahead.
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Old 11-01-2020, 07:26 PM   #11
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TRYING to be helpful, not critical, but are you saying you cannot find ANY 4-5,000 KW genset with a diesel motor???
The only thing I found in this range is a 5kw Onan unit but it cost just as much as the 6Kw Onan (which is the same form factor of the current 7.5 unit and could be a simple downsize option) at almost $9K new off the shelf. It's too bad there are not a lot of other diesel options (at least from what I could find).
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Old 11-01-2020, 08:11 PM   #12
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I realize they are really only “portable” gensets, but I understand you expect to make it a permanent install, so take a look at those advertised on Amazon. They have some claimed to offer extended run times and diesel for less than $1500.00.
Good luck in your quest to downsize.
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Old 11-01-2020, 08:12 PM   #13
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What about a used one from a salvage yard?
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Old 11-03-2020, 10:30 AM   #14
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I became a service manager in 1993. At that time several manufacturers were installing lp generators in diesel motor homes to save production costs. It did not take long for this trend to end. People did not like having to buy propane. You can pump your own diesel, but you have to wait on help for lp. It triples the fill up time. It was OK if you lived in Alaska (where you rarely need ac) but not in the sun belt. Trade in value was less and almost all buyers walked away when they saw the lp generators.
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