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Discussion Boards > Active Subjects > Messages as Posted > Generators Forum

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 08-18-2003, 10:28 Post: 62074
AC5ZO

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  PTO Horsepower and Generator Question

Chief, the formula that you have is good, but for PTO driven generators it is probably better to use 2 PTO horsepower for a KW of power produced. So, a 30HP tractor would be good for 15KW of power.

There are a few reasons for this but one of the biggest is that there is a drive train to go from 540 RPM to 3600 RPM for the generator. The efficiency varies depending on whether this drivetrain is belt or gear, but there are losses. All of these losses multiply together, so generator conversion efficiency, drivetrain efficiency, and so forth get you into the 60% neighborhood.

You also need some reserve engine capacity, or the system will crash faster than a NE power grid if a heavy load comes on line. If you exceed the tractor HP capacity, the generator will place an extraordinary load on the motor causing it to slow down. This causes the frequency to drop which in turn causes motors and transformers to draw more amperes and make more heat. All it takes is for a refrigerator to start or the well pump to kick in. In most cases, the high current load will kick out the generator circuit breaker or in some designs, the magnetic field in the generator collapses and it simply no longer generates power until the load is removed.






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 08-18-2003, 10:42 Post: 62082
AC5ZO

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  PTO Horsepower and Generator Question

Truck PTOs don't deliver anywhere near the engine HP. They are just intended to operate a few hydraulics, winches or lifts.






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 08-18-2003, 14:05 Post: 62102
AC5ZO

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  PTO Horsepower and Generator Question

What is she going to get you? ;-}






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