Linear current booster trades excess incoming voltage to boost outgoing current. For 12 or 24 volt Solar Force solar direct piston pumps. 15 amp model for use with 15 amps or less of PV input. Panel voltage: minimum 16 volts for 12 volt applications; minimum 32 volts for 24 volt applications. Comes with a float switch contact. Allows use of a float switch up to 2000' away with 18 gauge wire.