Portable solar panel kit 300W for boats with 20A controller and USB1、Efficient charging function: Using monocrystalline silicon solar cells, the photoelectric efficiency reaches 21%, the working current is larger, and the charging speed is faster, providing a fast charging experience for your device. 2、Multi functional design: Equipped with dual USB charging ports and DC5521 female battery clip interface, it can simultaneously charge 5V devices such as mobile phones and sports cameras, as well as 12V batteries for cars, ships, etc., meeting the charging needs of different devices. 3、Portable design: Lightweight and easy to carry, suitable for outdoor use, convenient for camping, hiking, travel and other activities, charging your device anytime, anywhere. 4、Durable material: The surface material is made of frosted PET, which improves the scratch and corrosion resistance, protects the solar panel from external damage, and extends its service life. 5、Environmental Protection and Energy Conservation: By using solar energy for charging, there is no need for an external power source, which is energy-saving and environmentally friendly. It provides reliable power support for outdoor activities, allowing you to enjoy the convenience and environmental benefits brought by clean energy.