Tektrum MPPT 20A 48V Solar Panel Charge Controller for Golf Cart/Boat/RV- 30% Power Boost Maximum Power Point Tracking - up to 30% solar panel power boost; Microprocessor controller pulse width modulation (PWM) charging Under voltage protection Rated Voltage: 48V; Overload protection (automatic restoration); Short circuit protection (automatic restoration) Thunder protection; Reverse discharge protection; Reverse polarity connection protection (automatic restoration) Rated Current : 20A; Efficiency: 95% ~ 97%; Open Voltage of Solar Panel :  80V (48V battery); Over-charging Protection : 54.8V; Low Voltage Disconnection / LVD: 43V; Dimensions: 7.5 x 4.25 x 2 in; Weight : 20 ounces