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The Boyer Brandsen power box is a self regulating rectifier with an internal current and voltage storing capacitor. Connecting directly to the alternator the output is approximately 15 volts with no current being drawn and 14.5 volts with some load. These values are just right for charging a 12 volt battery or running the electrics direct. The unit has been designed using the latest power technology semi-conductors to provide stable, direct current from standard permanent magnet alternators. Single phase and Bi phase units control 200 watts.