Build generator with Yanmar engine

thomasinnv · September 13, 2017, 06:16:47 PM

At 1800 rpm i think 6000 to maybe 6500 sounds about right. The onan inverter generators run faster than 1800 at higher output. Run that yanmar at 3600 and you can probably pull down 8k. I wouldnt want to listen to that racket though. I would run it at 1800 with direct drive and about a 6k or 6.5k head. Or run it around 2250 with a belt drive and run a 3600 rpm 7.5k head. If the engine cant carry the head at full capacity its not a big deal, just use less electricity. A larger head wont use any more fuel than a smaller one at the same output.

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Scott & Heather · September 13, 2017, 07:00:52 PM

6500 watts would be plenty for us. Once again I've been happy for years now with 5500. Anything more than that is gravy

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PP · September 14, 2017, 05:05:42 PM

Is there any value in an old Onan generator? It's a model #5000K with an attached opposed twin cylinder gasoline engine with electric start. Way too heavy to lift by hand. It's been out of the weather in a corner of the shop for the last couple of years just collecting dust and has recently been thrown outside. Rain is coming soon and I will protect it if there is any value in it. But otherwise it becomes scrap. OH-I should add that it says 1800RPM on the gen head.
Will

Geoff · September 14, 2017, 05:27:20 PM

Quote from: PP on September 14, 2017, 05:05:42 PM
Is there any value in an old Onan generator? It's a model #5000K with an attached opposed twin cylinder gasoline engine with electric start. Way too heavy to lift by hand. It's been out of the weather in a corner of the shop for the last couple of years just collecting dust and has recently been thrown outside. Rain is coming soon and I will protect it if there is any value in it. But otherwise it becomes scrap. OH-I should add that it says 1800RPM on the gen head.
Will

Yes, I took a similar engine with a bad gen head and bought a Chinese brush 5kW generator and made a running genset with an adapter to run off the flywheel.

--Geoff

PP · September 15, 2017, 07:13:54 AM

Thanks Geoff, I guess I'll put it somewhere dry for now.
Will

Scott & Heather · September 15, 2017, 08:58:15 AM

Ok so I just emailed Justin at Wrico the stats on my flexplate and bellhousing. All is fine in that department, but he's basically said that it is going to be a super low KW generator because of my HP. Or lack thereof. It's an 18hp unit but he says that is makes that HP at 3600 rpm. He's saying once we drop it down to 1800, it will only power a small KW head. What say you guys? I'm about to just take this thing back home and give it up at this point. I need at least 6000 watts.

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scanzel · September 15, 2017, 10:12:00 AM

Looking into the Internet for conversions I found that 7kw converted to mechanical hp would be 9.3871546219 hp. I would think that if you down the rpms of 3600/18 hp to 1800 rpms you would probably decrease your hp by almost half say 9hp. So from what I see 9hp could possibly give you at least 6 to 7 kw with 6 being the best option. Just my thoughts. I have a Kohler 9kw/1800 rpm rv generator so I will check and see what hp it is rated at for the 9kw.

eagle19952 · September 15, 2017, 10:18:29 AM

the power that is will bless you in good time.
pass.

Scott & Heather · September 15, 2017, 12:55:15 PM

I think that's what I'm going to do at this point. Justin was amazingly patient with me teaching me bunches. I'd much rather buy a whole unit at this point when the $$ are ready. Until then, my twin hondas are humming along.

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richard5933 · September 15, 2017, 01:48:46 PM

I'll chime in to agree about Justin and the folks at Wrico. They were more than helpful when the Kohler on my bus got murdered by some evil rodents. We ended up keeping our Perkins and getting a 13kw head from Wrico. I would have replaced the whole unit with one of theirs, but since our has the cooling plumbed into the bus cooling system that wasn't possible.

Either way you go, at least you've gotten a great base of knowledge now for moving forward. Who knows, maybe another (slightly larger) diesel engine will drop in your lap sometime soon?

Richard

Scott & Heather · September 15, 2017, 04:37:32 PM

Richard you speak truth. And I can only hope one does lol

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OneLapper · September 15, 2017, 07:59:58 PM

Scott,

18 hp doesn't sound quite right. What was the mower model number? I owned a JD dealership and still have many many many tech manuals on CDs. The smallest of the Yanmar 3TNEs were 18hp (as used in the Diesel Gator), but a commercial mower would have been much more. Even the twin cylinder Yanmar in the 735 comm mower was 18hp.

Ebay may have the generator style governor you would need.

BTW, the Mitsubishi K3D in my 8500 watt Westerbeke is rated at 21hp at 3600 and 12hp at 1800 rpm. Runs at 8500 watts at 1800 rpm without any issues, at 12 hp.

Mark

Scott & Heather · September 16, 2017, 03:36:59 AM

Hey mark it was a John Deere 2243 greens mower. 3008D001 motor. I am only guessing but I think it's an 18hp unit. It has a pump drive adapter on the flex plate because it ran entirely on hydraulics.

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OneLapper · September 16, 2017, 05:50:30 AM

Scott, that has a ETNV70 Yanmar. My manuals show it should be 8.75kw at 1800 rpm, which translates to 11.7 hp, which will run a 7500 watt gen head.

Thats a sweet little engine. Should have a SAE #5 bell housing.

thomasinnv · September 16, 2017, 07:36:21 AM

I say go for it Scott!

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