This is a three-time controller into the evening (evening) working for time ,an interval of rest or pause for time,Dawn working for time (morning light function),the user can according to their needs ,set a different time MPPT 20A/30A/40A solar controller applied to the solar photovoltaic system which is used to coordinate solar panels, storage battery and load. It is a very important assembly in the photovoltaic system. It is different from other solar controllers that it is add the comprehensive for protection function makes the whole solar photovoltaic system operate efficiently and safely MPPT 20A/30A/40A solar controller can adjust automatically the working voltage of solar panels, which can make solar panels work consistently in the maximum power point of the V-A characteristic curve in a whole day. Compared with common solar controllers, it is equipped with temperature compensation function, can make the work efficiency of photovoltaic modules increased by 30%, and can observably prolong the life of the storage battery MPPT 20A: MPPT 20A Solar Panel Charge Controller Regulator Solar panel 260W/12V 520W/24V (Without USB Output) for 520W(24v) solar panel with dark activated function, Max current is 20A Timer Intigrated (Lighting function) MPPT 30A: MPPT 30A Solar Panel Charge Controller Regulator Solar panel 380W/12V 760W/24V for 760W(24v) solar panel with dark activated function, Max current is 30A Timer Intigrated (Lighting function) USB 5V charging (for 500mA) for mobile phone MPPT 40A: MPPT 40A Solar Panel Charge Controller Regulator Solar panel 500W/12V 1000W/24V for 1000W(24v) solar panel with dark activated function, Max current is 40A Timer Intigrated (Lighting function) USB 5V charging (for 500mA) for mobile phone. MPPT Series controller has the following features: 1, LCD screen display 2, Easy operation interface 3, MPPT+PWM charging mode(Controller Provided MPPT Maximum power point tracking Function,charging mode is PWM) 4, Parameter user can reset, 5, A for key to open and close the load, 6, A for key to restore the factory settings, 7, Battery reverse discharge for protection, 8, Battery reverse polarity protection 9, Battery under voltage for protection, 10, Overload, short-circuit for protection, 11, Automatic temperature compensation function, 12,Can charge and discharge at the same for time, for Always keep the battery in full status 13, Compared with normal solar charge controller, this MPPT controller could increase efficiency by 10%-30% 14, Solar LCD series a kind of intelligent,multipurpose solar charge and discharge controller Note: Only MPPT 30A and 40A with USB Port Data Sheet: Model T20 T30 T40 Maximum power current 20A 30A 40A Installation Lin mm2 8mm2 10mm2 12mm2 Installation Line(AWG) 8(AWG) 7(AWG) 6(AWG) System load loss 13mA Loop for Buck 100mV Specification Battery float voltage 13.8V 12V system /27.6V 24V system Battery under voltage) for protection 10.6V 12V system /21.2V 24V system Battery (under voltage) recovery voltage 12.6V 12V system /25.2V 24V system Charge mode MPPT+PWM MODE Operating Temperature -10~60C Storage Temperature -30~70C Humidity requirements 90%, No condensation Temperature compensation -4mV/Cell/C Temperature Probe (built components) NTC 100K thermistats Maximum open circuit voltage of the solar panel 18V-24V 12V system 36V-48V 24V system) Solar panels maximum open circuit voltage (V) 48V Size: T20: 142x88x45mm T30: 185x90x45mm T40: 188x95x45mm Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1x MPPT Solar Controller 1x User Manual 1x Temp Sensor