Features: Adopt advanced MPPT charging technology to automatically track the maximum power point, 10%~30% higher than charging efficiency the ordinary controller. Intuitive LCD display and graphic symbol, simple control buttons. Intelligent PWM charging mode with automatic temperature compensation. Adjustable control parameters of charging and discharging, settable load operating mode. All round protection functions: Battery reverse discharge, under voltage, reverse connection protection. etc. Specification: Model: T40 Charging mode: MPPT + PWM System voltage: 12V/24V Auto Maximum current: 40A System load loss: 13mA Loop buck: 100mV Battery floating voltage: 13.8V(12V system) / 27.6V(24V system) Battery undervoltage protection: 10.6V(12V system) / 21.2V(24V system) Battery undervoltage recovery voltage: 12.6V(12V system) / 25.2V(24V system) Temperature compensation: -4mV/cell/°C Temperature probe: NTC 100K thermostat Maximum open circuit voltage of solar panels: 18V-24V(12V system), 36V-48V(24V system) Mounting wire: 6AWG / 12mm2 Working temperature: -10~60 Storage temperature: -30~70 Humidity requirement: 90%RH, no condensation Dimensions: 187*97*61mm / 7.4*3.8*2.4in Package list: 1 * Solar Charge Controller 1 * Connector 1 * User Manual Note: Due to the difference between monitor and light effects, the pictures may not reflect the actual color of the item. Please allow slight error due to manual measurement.