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Re: What hp tractor needed for 20KW generator requ
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Posted by MarkB on June 25, 2004 at 05:03:35 from (64.31.11.166):
In Reply to: What hp tractor needed for 20KW generator requirin posted by Newt Fawcett on June 24, 2004 at 20:57:12:
As RAB pointed out, 20 HP equals 15 KW. So if you have a generator that says it needs only 20 HP, it's not a 20 KW generator. More likely it is either grossly overrated or it is really a 20 KVA generator. (KVA and KW are NOT the same thing. For anything but a pure resistive load, e.g. a light bulb, watts will be less than volt-amps.) Now how big of a generator you can run with a given PTO horsepower depends on the type of loads you're going to have. If you need a constant 20 KW, I wouldn't try it with less than a 40 HP tractor. Chances are you don't need anywhere close to 20 KW, except for brief periods, so you could get by with a smaller tractor. Ron's advice was right on. They make special PTO-driven alternators that couple right up to your tractor. They aren't cheap, but if your homemade PTO drive blows up on you, it will sling pieces for a couple hundred yards. All tractor PTOs operate when the transmission is in neutral, because they're intended to run stationary equipment. Not all PTOs operate when the clutch is disengaged, but most modern tractors have "live" or "independent" PTOs that do.
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