Ram.. I looked real serious at those PTO generators after that Winter Storm last Christmas left me without power for 7 days. I looked at that same model in N.Tool that you are looking at. To make a long story short I decided to save my money to get a self contained generator for the following reasons:1. The PTO units only save you a few hundred $$$ compared to a gas generator ~same size. By the time you get the PTO shaft, cart it or mount it, etc. not saving much money in that price range. The gas generator is tons more fuel efficient than running your NAA all the time, most generators that size will ramp-up and idle down based on load, and the engines are sized just for that job. Your NAA won't do a good job ramping up and down with load, and won't idle down, you will be running your NAA ~1/2-3/4 throttle to get 540 RPMs on the PTO. 2. I found a really good internet article from the Canadian Ag. guys talking about farm equipment failures from running PTO driven generators. The generator output is related to RPM accuracy (540 RPM PTO) and power demand. To much load, or too low RPMS, you get voltage drop or frequency drop, burns-up motors, compressors, etc. That article only recommended PTO generators if you were going to stand over the tractor to insure it ramped-up properly with load and maintained the proper RPM's range on the PTO to insure proper power output. They also recommended you get a PTO generator with a built-in Hertz and Volts meter so you can monitor the power output.
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