Features： 1、This solar Charge controller helps you automatically manage the work of solar panels and batteries with a built‑in industrial microcontroller. 2、Equipped with overcurrent protection, short circuit protection, reverse connection protection, low voltage, overcharge protection, 3 level PWM charging management. 3、This solar charge controller will help you safely improve system efficiency and extend battery life. 4、The charge controller should connect the battery first, then the solar panel, and finally the load! The disassembly sequence is contrary to the wiring order 5、Waterproof and moisture‑proof to avoid damage to components or short circuit fault. The connection must be strong to ensure good contact. Specification： Item Type: Solar Charge and Discharge Controller Material: ABS Rated Voltage: 12V/24V (Automatic Voltage Identification) Maximum Load Current: 10A Solar Panel Input Voltage: 12V-20V / 20V-40V When the length is less than or equal to 1m, the voltage drop of the charging circuit is less than 0.55V When the length is less than or equal to 1m, the voltage drop of the circuit is less than 0.05V Full Disconnect: 13.7V-14.4V / 27.4V-28.8V Undervoltage Disconnect: 10.5V-11V / 21V-22V Temperature Compensation: -3mV / ° C /cell No-load Loss: ≤10mA Maximum Wire Size: 2.5mm² Ambient Temperature: -25℃-+55℃ Package List： 1 x Controller  1 x Description