... , maintenance-free, safe, reliable, energy-saving, efficient;Photovoltaic water pump, Permanent magnet brushless motor, Maximum power point tracking(MPPT)Ambient ... installation, accident or mishandling during shipment, connecting to improper line voltage, or serviced by anyone other than an authorized factory ... 4 inch 48V screw solar powered solar submersible water pump system (4SPS3.6/80-D48/750)