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Author Topic: ONAN 7.5kW DIESEL ....Opinions?  (Read 5624 times)
Stormcloud
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« on: July 06, 2010, 11:25:41 AM »

Hi:
Locally (almost) for sale is an Onan 7.5kW 'Commercial' diesel generator with 2250 hours on it.
It has a 3 cyl Kubota engine powering it.

It is not the Quiet Diesel type....
here's a photo.


Any experience with these? What do I look for when checking it over?

Thanks!

Mark
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Mark Morgan    near Brandon, Manitoba, Canada
1972 MCI-7     'PapaBus'  8v-71N MT654 Automatic
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« Reply #1 on: July 06, 2010, 11:27:51 AM »

Mark, you'll need my address for sending it lol.
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gumpy
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« Reply #2 on: July 06, 2010, 11:32:21 AM »

Mark,

How much are they asking for that unit?

I don't know a lot about the commercial units. I would determine how loud it is, for starters. Then see if they have records on maintenance (oil change, air filter, etc).
2250 hours doesn't seem like a lot, but then again that's more than a year running 8 hours a day, 5 days a week.

I only put about 40 on  mine last year.  I have the Quiet Diesel 7.5kw model which also has the Kubota in it. I like it, so far.

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Craig Shepard
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Stormcloud
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« Reply #3 on: July 06, 2010, 01:56:00 PM »

Asking price is $2600 CDN.....thats like $19.95 usd.... Cheesy
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Mark Morgan    near Brandon, Manitoba, Canada
1972 MCI-7     'PapaBus'  8v-71N MT654 Automatic
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« Reply #4 on: July 06, 2010, 02:41:44 PM »

Somehow I saw that coming lol.
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gus
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« Reply #5 on: July 06, 2010, 05:00:37 PM »

I think you will find out that $2600CDN is about the same as $2600US now, but it is still not a bad price!!
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PD4107-152
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Stormcloud
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« Reply #6 on: July 06, 2010, 05:23:52 PM »

I agree, $2600 seems like a reasonable deal, if it checks out OK. A 3 cyl Kubota should be good for lots more hours.

I would remote mount the rad and install an electric fan on it.I could muffle it a couple times to make it quieter, and maybe a quiet box for the mechanical stuff.

Its been for sale for at least a couple months, and the price has dropped. Maybe not a big market around here?

I will likely call tomorrow and find out more.



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Mark Morgan    near Brandon, Manitoba, Canada
1972 MCI-7     'PapaBus'  8v-71N MT654 Automatic
robertglines1
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« Reply #7 on: July 06, 2010, 05:32:16 PM »

go for 1500---
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« Reply #8 on: July 06, 2010, 05:40:19 PM »

Im kinda thinking that too......its "$2600 OBO".....I may have an 3000w inverter gennie with only a few hours on it to sell if this one checks out.
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Mark Morgan    near Brandon, Manitoba, Canada
1972 MCI-7     'PapaBus'  8v-71N MT654 Automatic
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« Reply #9 on: July 06, 2010, 05:45:49 PM »

I just pd 1500 for a 7.5 with 34 hrs on it..its not apples to apples is a gas unit but is a rv unit in soundproof box..I think the one your looking at is better...the seller started at 2600$
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
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« Reply #10 on: July 06, 2010, 05:53:18 PM »

Mark, as an old retired Onan dealer here's my opinion:

Onan built a DKC (4 KW) and a DKD 7.5 or 8KW some year ago and they were reliable little generators.

Of course, like with anything used, it's worth is only as good as the maintanence it's had. They were not loaded down with a bunch of solid state boards only the voltaage regulator as far as I can recall. Please remember I retired some years ago.

THe Kubota engine is reliable and the generator end was built in MN. As I always advise, clean oil, clean coolant, clean air and clean fuel will make the worst generator the best investment you'll ever make.

Best,

NCbob
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« Reply #11 on: July 06, 2010, 10:22:20 PM »

Just to show you how long that 3 cylinder Kubota can last, I have a friend that had a Powertech 7.5kw with the same 3 cylinder.  When he sold the truck, it has over 23,000 hours on it.  So 2,300 hours is like 92,000 miles.  Considering a new unit is around $6,000, that looks like a good price.  You can remote mount the radiator with an electric fan (talk to Dick Wright at Wrico International) to make it really quiet.  Good Luck, TomC
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« Reply #12 on: July 06, 2010, 10:33:48 PM »

Integrate the cooling into the engine cooling system and then install a simple thermo controlled elect fan on the big rad.  All done!

John
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« Reply #13 on: July 07, 2010, 06:28:54 AM »

Unless you have a really BIG radiator, of which most buses do not, I would suggest you not run both engines with one radiator.  On a big rig truck, this isn't much of an issue, but with a bus, most buses have marginal cooling to start with, let alone adding another 15hp engine to the strain.  Plus-like what has happened to us, if you have a problem with the main engine, you still have the generator's radiator to run the generator while you fix the big engine-nothing like having air conditioning running on a hot day to take a break in the nice, cool insides.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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« Reply #14 on: July 07, 2010, 09:19:27 AM »

Unless you have a really BIG radiator, of which most buses do not, I would suggest you not run both engines with one radiator.  On a big rig truck, this isn't much of an issue, but with a bus, most buses have marginal cooling to start with, let alone adding another 15hp engine to the strain.  Plus-like what has happened to us, if you have a problem with the main engine, you still have the generator's radiator to run the generator while you fix the big engine-nothing like having air conditioning running on a hot day to take a break in the nice, cool insides.  Good Luck, TomC

With 300 HP pushing, a 15 HP genny would bump the load by 5%.  If that causes you a problem you have others that are more pressing.  You need to move a lot more air thru a proper sized rad for the genny than you do for the massive engine rad and that makes the one ever so much quieter.

Tom is right though.  Many have the Hydronics and hot water tank exchanger and genny all hooked into the engine coolant system.  They use isolating valves..to be sure.  It is design choice.   A lot of pluses and compromises and counter points.   You are going to be faced with a lot of that.

John
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"An uneducated vote is a treasonous act more damaging than any treachery of the battlefield.
The price of apathy towards public affairs is to be ruled by evil men." Plato
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« Reply #15 on: July 07, 2010, 01:50:54 PM »

I think I have the SAME exact generator, that I just installed this week. I paid 900.00 for it and they list on the internet for $9000.00!!!!! New of course. Mine had 1200 hours. They had 10 for sale at a place in Toledo, OH.

If you are familiar with my other threads, I was concerned about shoe-horning it in my AC bay with a plasma cutter.......... it's all done and lookin Gooooooooood!!  I'll post pix as soon as my camera is repaired or I get a new one.

The commercial unit I got is a "reconnectable" 3 phase. Basically, that just means I can set it up of single phase and still get 7.5kw. It took awhile to figure it out but, all said and done, I could do the next one in a half hour. Just 12 wires to reconnect and one pot. to adjust.

I'm not sure what the quiet ones sound like but this one sure isn't loud. (My 4kw gas job was waaaaaay louder.) It came with a large muffler that I mouted under it. I intend to box it in a bit to keep the noise down further and the heat out of the bay a little better.

I may be biased, and I may end up eating my words, but I'm liking this guy pretty good so far. Paul Elbisser picked us up both one but, he opted out of his for a new one, set up for a coach. I sold that one to a friend who was beside himself to get it.

Bottom line............... I like mine!
  Chaz
« Last Edit: July 07, 2010, 03:51:30 PM by Chaz » Logged

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James77MCI8
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« Reply #16 on: July 07, 2010, 03:15:41 PM »

Genny in the engine loop sets you up to loose the use of both if you spring a leak in one.
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Bill B /bus
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« Reply #17 on: July 08, 2010, 07:29:00 PM »

True for heat loading.
However, you now set yourself for a single point failure. Loss of coolant takes out both engine and genset. So not only are parked  but you have no power once the batteries run down.
Separate cooling systems are no guarantee of always working. You will probably only lose one system.
Belt and suspenders is good.
Bill
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« Reply #18 on: July 10, 2010, 09:25:52 AM »

What about creating a loop system where you could go either way with a couple ball valves??? ANy advantages or die advantages??
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Pix of my bus here: http://s58.photobucket.com/albums/g279/Skulptor/Motor%20Coach/
What I create here:   www.amstudio.us
 
"Imagination is more important than knowledge". Albert Einstein
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