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3 Pt PTO generators
Glen,I have a New Holland Sub Compact and my diesel engine has a governor on it. It holds the speed much better than any gas engine ever could. I don't think your friend, the electrical engineer, has had much experience with tractors. Any motor that you overload, beyond its torque capability, will loose speed and cause frequency fluctuations. But if the generator is sized to the PTO output horsepower, the engine should be able to maintain the frequence quite well. An awful lot of farmers use these to power various equipment, depending on the type farm it is. If what your friend says were true, a lot of farmers would go out of business buying electric motors. Electronics are much more sensative to over or under voltage than motors are. We have run some motors 20% over on frequency. It doesn't hurt them, they just run faster. Ask him if he ever heard of a frequency controlled AC motor. We have frequency controllers on many motors and run them down to 15 HZ, which doesn't affect them either. You will never see that much difference in a PTO unit, so I wouldn't worry about it. The Coleman units will probably give you more difference than the PTO units. By the way, I am a Electrical Engineer too.
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3 Pt PTO generators
I agree Farminlady (not picking on you though), if the price is wrong. I built a 3 pt hitch PTO genset. 10000 watt unit for about $850. About the same price for a 6000-7000 watt gas stand alone. Took some work, some scrap metal and a little welding, but it works great. Had a drive shaft from my tiller, bought a splined adapter for the shaft, a couple of bearings, two pullies and a belt. Oh and a little drawing to make sure it all fit. My PTO speed is not 540 though. If someone has a 540 pto they would definately need two steps up or a rather large 33" pulley on the PTO and about a 5" on the generator. So you see the need for two steps. When I am moving snow, I could leave this unit on for weight. It is well protected from damage in the frame. And it's made for outdoor use. But it isn't as difficult to put on the machine as you would think. Also with bad weather in mind, and the frequent power outages that come with it, I have 1000 gallons of fuel to get me through in the tanks. So I opted, with my wife approving, to go the PTO way. A deisel unit would be great(separate) but they are definately to expensive. I don't want gas in my garage, except for the car, so a gas unit is out. To easy to have an explosion. In so far as excessive wear on the tractor, well I bought it to use, and seeing a diesel runs best when it is used the most, I am using this for everything it's worth. It's a diesel, it can take it. In so far as having to big a genset, I would rather have excess capacity, than run the genset at its max output. Then you have something extra if you really need it. I have a deep well, and she still grunts starting that, but that is with the well pump running, and supper cookin on the electric stove.
Bill
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07-18-1999, 00:00 
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