1、Innovative maximum power point tracking technology (MPPT) with maximum power point tracking efficiency >99%. 2、Full digital control technology, charging conversion efficiency up to 97%. 3、LCD screen dynamically displays the operating data and working status of the device. 4、Automatic identification of 12V/24V system voltage. 5、External temperature sensor for more accurate temperature compensation. Features: Innovative maximum power point tracking technology (MPPT) with maximum power point tracking efficiency >99%. Full digital control technology, charging conversion efficiency up to 97%. LCD screen dynamically displays the operating data and working status of the device. Automatic identification of 12V/24V system voltage.  External temperature sensor for more accurate temperature compensation. Built-in over-temperature protection mechanism, when the temperature exceeds the set value, the charging current decreases linearly with temperature, thereby reducing the temperature rise of the controller and avoiding high temperature damage of the controller. Real-time electricity statistics recording function. Choice of battery type, working mode and protection method. Four-stage charging: MPPT, strong charge, balanced charge, float charge. 2 USB interface (EU series) current-limiting charging mode, when the solar panel power is too large, the charging current is greater than the rated current, the controller automatically reduces the charging power, and works at the rated charging current. Comprehensive electronic protection.    Specification: Model MT3075 Battery Parameters System Voltage  12V/24V automatic recognition Maximum Charging Current 30A MPPT Charging Voltage < 14.5/ 29.0V@25℃ Boost Voltage 14.5/ 29.0V@25℃ Equalization Voltage 14.8/ 29.6V @25℃(Liquid) Float Voltage 13.7/ 27.45V@25℃ Low Volt.Disconnect 10.8~ 11.8V/ 21.6~ 23.6V,SOC1~5(default 11.2/ 22.4V) Reconnect Voltage 11.6~ 12.8V/ 23.2~ 25.6V Overcharge Protect 15.5/ 31.0V Maximum volt on Bat.terminal 35V Temp.Compensation - 4.17mV/K per cell(Boost, Equalization),- 3.33mV/K per cell(Float) Battery Type Liquid,Gel Panel Parameters Maximum volt on PV terminal 55V  Maximum input power 390/780W Dusk/Dawn detect volt. 8.0/ 16.0V MPPT tracking range (Battery Voltage+ 1.0V)~Voc* 0.9 Load Output Current 30A Work mode Standard,D2D,Street lamp mode(2~9hours),Manual System Parameters Maximum tracking efficiency > 99.9% Maximum charge conversion 97.00% Self consumption 7mA Ambient temperature -20~+50℃ Storage temperature -25~+80℃ Ambient humidity 0~100%RH Protection degree IP32 Maximum Altitude 4000m  Around oblique line value separately on behalf of 12V and 24V system's value. Size: 189 x 182 x 58mm / 7.44 x 7.17 x 2.28in Package List: 1*Controller 1*Temperature Probe 6*Connection Terminal 1*Users Manual