I am installing a wind power electrical system at my home. The mill has a DC turbine motor pushing 2860 watts-22 amps. I want to use a car/truck alternator. It is pushing 250 amps-watts ? They both charge DC batteries. How would I find out the watts in the alternator and are these the same kind of power and if not whats the difference?
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about 2 years ago
The difference is voltage. Your unit producing 2860 watts at 22 amps is charging at 130 volts, by my calculations. A car alternator charges at 15 volts.
I have an off-grid home, so I know different off-grid homes use different battery-bank voltages (typically depending on what inverter you use), What voltage battery bank are you using? That would be a better place to start this discussion, and we could discuss how to convert to that figure. Also, car alternators are not built to a very high quality for running 24/7 – the bearings wear out in less than a year of continuous service.
I have personal experience using 3-phase motors as generators, and that’s my favorite method, because these motors are industrial in quality, and last 10+ years in continuous service. They generate at 240 volts a.c., and require 3 transformers plus diodes and a filter capacitor to convert to a different voltage at d.c. Much smaller wire sizes can be used from your windmill if you go this route, too. Write me privately if you’re interested in knowing more about this option.
about 2 years ago
Don is correct about the voltage/power relationship.
But a car alternator is not DC. Hence the name alternator. The output is AC and is converted by rectifiers to DC.