PTO Generators Observations: Generators  -- Tools Discussion Forum and Review PTO Generators Observations: Generators -- Tools Discussion Forum

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 01-01-2004, 04:56 Post: 72825
harvey



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I got my new Tiger Power generator from Dyna Tech in PA. It is a 20 KW generator. However the 20's were out of stock so they asked if a 30kw would be ok for a subisitute, same money. Uhhhhhhhhhh geezeeeeeee I think it would be ok. Remembering what Art said about to much tractor and not enough generator.

I have HP enough for about 17KW so the 20 was just over the safety line.

Anyway finially got trailer built photo # 7 and tested generator. All breakers off and service disconnected PTO gen to operating speed Volts at 220 and 60kh cycle it came in at 100 rpm less the rated 540 rpm.

Turning everything on in the house did not even phase it. The tractor eng never grunted as the small loads were applied. The tractor did grunt a little and voltage never quivered when the 220 water pump kicked on. I did not try and see if my air compressor or other large stuff would affect it because they would not be used anyway.

I had the gen out the other day and plugged my welder into it and even at the heaviest amp setting and biggest rod I have the tractor only made a very small grunt as arc was struck.

I am a happy camper with this set up. But do think I'll look for a small gen to run wood stove fans at night.






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 01-01-2004, 07:17 Post: 72827
Billy

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 PTO Generators Observations

Sounds like a heck of a deal.

On the small gen for the heater fan. The guys that put my generator in (pic #1) had a dandy little generator. It was small enough to carry around with one hand.






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 01-01-2004, 10:26 Post: 72833
DRankin



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Harvey, clear up a couple of points if you please.

Did you actually get a 30 KW?

And run through the RPM thing again? Is your PTO shaft turning 100 rpm less or your engine running 100 under the rated pto speed?

Thanks.






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 01-01-2004, 11:35 Post: 72840
TomG

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Sounds like a good present and good it's working beyond expectations. I think what you are experiencing is that ratings for AC equipment are pretty conservative and houses usually are running much below the service rating.

Even fairly high starting surges for electric motors are of short duration. There's a decent change that inertia of the engine, drive train and larger generator is sustaining the rpm for the short time it takes for a motor to come up speed even if the requirements are greater than the tractor's pto hp. A larger generator and higher surges will be a bit harder on the pto clutch. You probably don't have to consider if the generator is exceeding it's duty cycle though.

Several motors starting up at the same time could be a different story though. I know that's what my 6.5kw standalone doesn't like much--never have popped a main though. It is possible for a big generator to bring a tractor down. That might be an issue if a number of large motors are on the system and it's running unattended. If it's an issue smaller mains probably could be installed.






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 01-01-2004, 12:05 Post: 72844
harvey



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Mark yes it's a 30kw gen. 125 main breaker, however the labels read 20 kw because it's what I paid for. I have no issue with that I am pleased with the heavier setup. These folks treated me very good and I appreciate the no cost upgrade. It was only a couple of weeks from time of order till it was at home.

I'd have to look for sure but me thinks my tractor is rated at 2700 for 540 pto? the generator runs at 2600 or 100 rpm below whatever it is rated on the tach.

Tom you are right about the surges with bigger motors. Many times when the milk cooler compressor kicked in it really would make a 100hp tractor grunt, of course big vacum pump running at same time. We won't even discuss silo unloaders. I'm glad most of those are a thing of the past. As I said everything run very smooth with no noticiable fluxuations in the voltage meters. Of course that is why I'm happier with more generator than tractor. A big tractor would melt down a small generator and a big generator will bring a small tractor to its knees with a brown out and no damage done.

Thats why I did not try any of my larger shop tools. I guess I could just to see.

The main purpose of generator is: the boss to keep her shop running along with the computers when she is working, lighting and if I wanna watch TV in the evening. Generally just making things more comfortable for us.






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 01-01-2004, 16:19 Post: 72848
Art White



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With a spare gas tank around you have the Farmall M for back-up if ever the need. That way the loader tractor would be available for normal details. Nice work Harvey!






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 01-01-2004, 19:02 Post: 72859
harvey



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Art you must read minds!






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 01-01-2004, 20:13 Post: 72862
Art White



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Good luck with it as it seems like you do have it beat!






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 01-02-2004, 06:51 Post: 72883
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Good to hear a happy man! The issue of big tractors with small generators may be an issue for people still looking but not for Harvey. I think most melt downs come from people running a generator between its continuous and peak ratings for times longer than the duty cycle rating. That can easily happen with small lower-end generators. The may be advertised to impress by low cost and high peak ratings but at the expense of shorter duty cycles. The generator's breakers protect against peak loads but not against prolonged loads between the continuous and peak ratings. To manage this problem, the generator has to be larger than typical continuous loads. Harvey isn't likely to have this issue but I do. The automatic start up panel discussed here awhile back that shuts down circuits on a priority basis to manage load is a potential fix.






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 01-03-2004, 08:57 Post: 72947
grinder

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http://www.gov.on.ca/OMAFRA/english/engineer/facts/00-059.htm

Harvey
I am thinking of getting a gen. for my 7500.
Can I use this info from Canada?






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