PEWTRESS, NATHAN JAMES III City/State: St George / UT PCF Number: 195766 Arrest Date: 19:22:00 02/01/18 Agency: St George Police Department RELEASED FROM CUSTODY
then you need a little more rpm to get the alternator to charge above the battery voltage. About 13.5 volts. The average alternator is now between 1,300 to 2,100 rpm. I set up an old 35 amp alternator to run off a 1/3 hp 1,750 rpm washing machine motor at a 1:1 belt ratio. Using the stock regulator would stall the 1/3hp motor. I put a large adjustable resister on the field connection of the alternator.
Just for a point of reference, a standard automotive alternator puts out 60A @ 14V = 840W. 1hp = 746W, so it takes over one hp to turn your car's alternator to full output, not counting losses in heat or the belts... Last edited: May 26, 2009. I am an engineer and an academic.