Features 1Voltage Regulation: This controller has a voltage regulation function. When the battery is open circuited or the lithium battery BMS is overcharged the battery terminal of the controller will output the rated charging voltage value and the MPPT tracking efficiency is as high as 99.9 percent. 2High Efficiency: The built in maximum power point tracking algorithm of the controller can significantly improve the energy utilization efficiency of the photovoltaic system which is 15 to 20 percent higher than the traditional PWM charging method. Due to the use of advanced digital power technology the circuit energy conversion efficiency is as high as 98 percent. 3Multiple Protection Functions: The controller has solar panel short circuit protection battery open circuit protection and TVS Thunder protection and built in over temperature protection mechanism. 4Current Limiting Charging Mode: When the power of the solar panel is too large and the charging current is higher than the rated threshold the controller automatically reduces the charging power to make the solar panel work at the rated charging current. 5Ease of Use: The controller can be connected to an external LCD screen or a Bluetooth module so that it is easy to view the operating data and status of the device and to support the modification of controller parameters to meet the communication needs of different situations. Specification Item Type: Solar Charge ControllerMaterial: Aluminum AlloyCharging Current: 20ADischarge Current: 20AMaximum PV Power: 260W 12V 520W 24V Package List 1 x Solar Charge Controller1 x Instruction Note 1. The applicable voltage of the controller exceeds the safety voltage of the human body so please read the manual carefully before use and operate the controller after completing the safety operation training.2. There are no parts that need to be maintained or repaired inside the controller and users are not allowed to disassemble and repair the controller at will.3. Install the controller indoors to prevent exposure of components and prevent water from entering the controller.4. Please install the controller in a well ventilated place to prevent overheating of the radiator.5. It is recommended to install an appropriate fuse or circuit breaker outside the controller.6. Before installing and adjusting the wiring of the controller be sure to disconnect the wiring of the PV array and the fuse or circuit breaker near the battery terminals.7. Check that all wiring is tight after installation to avoid the risk of heat build up due to poor connections.