This is a three-time controller into the evening (evening) working time ,an interval of rest or pause time,Dawn working time (morning light function),the user can according to their needs ,set a different time. MPPT 20A: MPPT 20A Solar Panel Charge Controller Regulator Solar panel 260W/12V 520W/24V (Without USB Output) Compatible with 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 Compatible with 760W(24v) solar panel with dark activated function, Max current is 20A 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 Compatible with 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: Compared with normal solar charge controller, this MPPT controller could increase efficiency by 10%-30% 1, LCD screen display 2, Easy operation interface 3, MPPT+PWM charging modeController Provided MPPT Maximum power point tracking Function,charging mode is PWM) 4, Parameter user can reset 5, A key to open and close the load 6, A key to restore the factory settings 7, Battery reverse discharge protection 8, Battery reverse polarity protection 9, Battery under voltage protection 10, Overload, short-circuit protection 11, Automatic temperature compensation function 12, Can charge and discharge at the same time, Always keep the battery in full status Note: Only MPPT 30A and 40A with USB Port. Package contents: 1* MPPT Solar Controller 1* English User Manual 1* Temp Sensor