I once put a 12v alternator belted to a tired 5hp garden tiller motor. Under some circumstances, like charging a nearly dead battery, the alternator put a heap of hurt on that motor - lugged it right down. So, based on that my guess is that a 1/2 horse electric motor wouldn't begin to keep an alternator happy. Now, if you want to do the math, and knowing full well, that nothing in your system runs at full 100% efficiency, you already know the outcome..... Won't run for very long. Every time you convert a form of energy to another form, there is a net energy loss.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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