why is my alternator (PMA) not keeping up with the load and letting my battery run down? I have a 48 volt system and I'm useing a 48 volt permenant magnet alternator unregulated direct to the battery. It takes 51 volts to charge but I'm running it between 53 to 60 volts to get these voltages I'm running at 2700 to 3000 RPM at the PMA, so far so good. According to the power curve chart at that RPM it should produce 75 AMPS. My load is 30 AMPS but it only produces 17 AMPS and I can't figure why. Why is the PMA not meeting the demand and how do i fix it? I have tried other alternators and they have a larger AMP deficit than this one. I need a fundamental reason why its not working. All the batteries,cables,and connectors are new. I've tested the RPMS the volts the AMP load and the AMP output from 4 different alternators. My PMA is producing power but will not meet demand by an average of 17 AMPS. Why?
2007-07-14
11:52:42
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11 answers
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asked by
jenric
1
in
Engineering