... installation, maintenance-free, safe, reliable, energy-saving, efficient;Photovoltaic water pump, Permanent magnet brushless motor, Maximum power point tracking(MPPT)Ambient ... temperature -20°C-50°CService life over 10 yearsWARRANTY TERMFrom the date of purchase ... dc 4 inch 48V screw solar powered solar submersible water pump system (4SPS3.6/80-D48/750)