Features:Automatic identification system voltage, 12/24V auto recognition. Humanized LCD displaying and double button operation of man-machine interface. Completed technical data for setup and modify.The load control mode can be selected, the timer function can be reset for street light at night. Discharge capacity control.Working storage function: record the total run time of system, record timers of error during running time, record times of full charged battery. Reliable over voltage protection, short circuit protection, over load protection, overcharge protection, over-discharge protection. Accurate temperature compensation, correcting the charging and discharging voltage automatically, improving the battery lifetime. Roundly reverse connected protection. Solar panels, battery, solar charge controller positive poles are all connected together, adopting negative MOSFET in circuit. Specifications:Current: 30A, 50A, 70A (optional)Rated Voltage: 12/24VUSB Output: 2.4A *2Over Charge Current(V): 13.7V/*2 24VOver Discharge Current(V): 10.5-11V/*2 24VTemperature Compensation: -3mv//cellEmpty Load Wastage: <45mALoop Voltage Drop: <200mvDisplay: LCD DisplayCharging Type: MPPTWaterproof Grade: IP32Material: PlasticColor: Black + OrangeSize: 17.5 * 14 * 4cm/6.9 * 5.5 * 1.6in(30A), 21 * 19.2 * 5.5cm/8.3 * 7.6 * 2.2in(50A), 22.8 * 20 * 5.5cm/9 * 7.9 * 2.2in(70A)Suitable for automobiles and motorcycles,or small household appliances.PackageWeight: 480g-1284gPackageList:1 * Solar ChargeController1 * User ManualNotes:1. The function of controller is to protectvoltage overshoot and overplay.2. When the batteryvoltage is too low, the controller stops the output; after the solar panel is charged, the cell recovers to 12.6V.3. 12.6V is the recovery discharge voltage.4. The normal voltage of the controller is 10.7V to 13.7V. These two voltage fluctuations can be set manually.If you have trouble in use, try adjusting the floatvoltage to 13.7V:First, you need to press the MCU control button for about 3-4 seconds, and then there will be a management interface on the screen.Second, you must press the add button on the screen until the voltage reaches 13.7V.Finally, you need to press the MCU control button again, which will save the controller record data when the display does not flicker..5. Use a 12V battery with a 17 volt solar panel, use a 24V battery with a 34 volt solar panel.