(20W/12V) Solar panel trickle charge battery charger for marine RV maintenance

General Description This 20W, 12V trickle charger is ideal for cars, trucks, caravans, boats, motorcycles, and any 12V lead-acid battery. Designed for outdoor use, it is waterproof and includes a built-in reverse diode to prevent reverse current charging. This product can recharge various equipment such as emergency lights, electric fans, and solar water pumps. Technical Specifications Power: 20W Panel: Monocrystalline Silicon Open Circuit Voltage: 14V DC and 5.2V USB Charging Voltage: 12V DC and 5.0V USB Output Current: 600mA (maximum) USB 2.0 Output: 5V 600mA Solar Panel Size: 210mm x 175mm x 2.5mm Installation Orient the solar panel towards the sun at a 30-40 degree angle to the ground. Connect the alligator clips to the corresponding terminals. Insert the USB 2.0 cable into the USB output port. Usage: Use outdoors in a sunny location for optimal performance. Avoid use on cloudy days or through glass. Do not place the charger outdoors on rainy days. Avoid scratching the surface of the solar panel with sharp objects. Other information: Package contents: 1 x solar panel, 1 x instruction manual (in Chinese and English), 1 x alligator clip, 1 x lighter. Caution: The positive and negative alligator clips should not be connected or touched during use. Allowable measurement error: +/- 1-3 cm.