This solar battery charge controller automatically manages and regulates the voltage and going into the battery from the solar panel, and it’s designed with short-circuit protection, open-circuit protection, reverse polarity protection and over-load protection in order to ensure that the batteries are not overcharged. Features - Color: As shown. - Size: 6.86x5.34x2.2cm/2.7x2.1x0.9 inch. - Material: ABS. - Stable performance: Built-in industrial microcontroller for stable operation in cold, high temperature and humid environments. - The voltage is automatically recognized and intelligent, providing for your . - Made of material for long time and durable use. - It has a simple design, but very practical in use, much convenience to you. - Comprehensive protection: Provides overcharge, overdischarge, overload protection, and short circuit and reverse connection protection. Specification - Rated : 20A. - Rated voltage: 14-50V. - Photovoltaic input power: 300W. - voltage: >15.5V. - Output to battery voltage: 13.8V. - Working temperature: -40~65°C. Package list: 1 x solar controller