Feature: 1. Wide Compatibility: Automatically detect 12V, 24V, 36V or 48V DC system voltage, compatible with a variety of battery types, easy to use. 2. Comprehensive System Protection: Aimed to defend your system, self diagnosis capability of the controller can evaluate and defend PV array short circuit; PV overcurrent; load overload; load short circuit; PV reverse connection; battery reverse connection; overheating. 3. PWM Design: Innovative PWM technology, the tracking efficiency is as high as 99%, and the peak conversion efficiency is as high as 98%. It is the best charging solution even in cloudy environments. 4. 4 Stage Safe Charging: With 4 stage charging function, batch charging, boost charging, float charging and equalizing charging, the controller can achieve fast, efficient and safe battery charging, avoiding excessive gas precipitation or battery overheating. 5. ABS, Aluminum Alloy Material: Made of premium ABS, aluminum alloy material, this controller is strong and durable, wear resistance, and corrosion resistance, comes with a long life pan. Specification: Item Type: Solar Charge Controller Material: ABS, Aluminum Alloy Input Rated Voltage: DC 12V, 24V, 36V, 48V (Automatic Identification) Maximum PV Voltage: 100V. Package List: 1 x Solar Charge Controller1 x Manual Note: Please read the manual carefully before use.