Features: 1Dual MOS anti backflow circuit, low heat generation. Complete 3 level smart PWM charging management, high efficiency. 2Large LCD display with backlight, clearly displays system operating information and indicates status and data, convenient to switch modes and parameter configurations. 3Adjustable charging and discharging parameters, with power off memory function. Automatically recognize the 12V or 24V system voltage. 4Safe to use, built in short circuit protection, open circuit protection, reverse connection protection, over current protection. Can be used for home, industry, commercial, etc. 5There are corresponding icon marks on the wiring terminals, which are used to connect batteries, solar panels and DC loads. Please install it in a well-ventilated place. Item Type: Solar Charge Controller Material: Plastic Rated Voltage: 12V or 24V battery voltage Maximum Charge or Discharge Current: 30A Solar Panel Input Voltage Range: Maximum 18-450W or 36V-900W Charging Mode: PWM Over Voltage Protection: 17V.34V Full Charge Power Off: 13.7V or 27.4V Under Voltage Power Off: 10.5V or 21V Over Discharge Recover Voltage: 12.2V or 24.4V 1 x Solar Charge Controller 1 x Manual 1 x Wire Connector