Characteristics: Automatic identification system voltage, 12/24V automatic recognition. Humanized LCD display and support two buttons of human-machine interface. Supplemented technical data for configuration and modification. Load control mode can be selected, timer function can be reset for street lighting at night. Control of discharge efficiency. Work storage function: records the total operating time of the system, records error counters during operation, records the times of a fully charged battery. Reliable surge protection, short circuit protection, overload protection, overcharge protection, over-discharge protection. Accurate temperature compensation, automatically correcting the charging and discharging voltage, improving battery life. Round reverse protection connection. Solar panels, battery, positive poles of solar charging controller are connected to each other, adopting negative MOSFET in the circuit. Technical data: Current: 30A, 50A, 70A (optional) Rated voltage: 12/24 V USB Output: 2,4 A x 2 Over charging current (V): 13,7V/ x 2 24V Excess discharge current (V): 10,5-11 V/ x 2 24 V Temperature compensation: -3mv/℃/cell Empty charge loss: andlt; 45mA Loop voltage drop: andlt; 200mv Display: LCD Display Charging Type: MPPT Waterproof Class: IP32 Material: plastic; Color: Black Orange Size: 17.5 x 14 x 4cm/6.9 x 5.5 x 1.6in (30A), 21 x 19.2 x 5.5cm/8.3 x 7.6 x 2.2 inch (50 A), 22.8 x 20 x 5.5 cm / 9 x 7.9 x 2.2 inch (70 A) )Suitable for cars and motorcycles or small household appliances. Package Weight: 480g-1284g List of packages: 1 x Solar Charging Controller 1 x User Manual 1. The function of the controller is to protect over-adjustment and excessive voltage. 2. When the battery voltage is too low, the controller stops the output; after charging the solar panel, the cell returns to 12,6V. 3. 12,6 V is the return discharge voltage. 4. The normal voltage of the controller is from 10,7 V to 13,7 V. These two voltage fluctuations can be set manually. If you have problems with use, try adjusting the float voltage to 13,7 V: First you need to press the MCU control button for about 3-4 seconds, then the management interface will appear on the screen. Secondly, you need to press the add button on the screen until the voltage reaches 13,7 V. Finally, you need to press the MCU control button again, which will save the controller record data when the display does not flicker.