Our company has an experienced professional technical team to help customers solve various solar charging problems, so that we can use pollution-free solar energy. That batteries will slowly leak after being stored for a period of time. And it will consume power for a long time, which will make the battery unchargeable. Therefore, we can use our solar charger to charge and maintain the battery. <br><br> <b>This product has the following characteristics: :</b><br> <br>1. Using high-efficiency polycrystalline solar cells, even if the panel is smaller than the traditional model, it still can achieve higher power efficiency. <br>2. Equipped with a charging controller, it has various protection functions that never cause any damage to the battery. <br>3. It is convenient to charge as long as there is sunlight to charge the battery. <br>4. Easy to connect. No need to pull long and complicated extension cords. At the same time it works under human body safety voltage and is very safe. <br>5. The surface is made of glass and easy to clean. <br><br> <b>Reminder:</b> <br><br>1. Before connecting the wires, separate the red and black clips to avoid collision and short circuit. <br>2. This product is a solar charging board which should be installed in a place where the sun is shining directly. The more sunlight, the better the charging effect. <br><br> <b>Specification:</b> <br><br>Solar Panel Type: polysilicon <br>Maximum Wattage: up to 20 watts <br>Current at Pmax: 1.11A <br>Open Circuit Voltage: 21.3V <br>Operating Voltage: 12V <br>Size: 18.1*13.8*1 inch <br>Weight: 4.4 lbs <br><br><b>Packing list:</b> <br><br>1 x Solar panel <br>1 x Charge Controller <br>1 x Battery cable <br>2 x Self tapping screw <br>2 x Expansion screws