-There is a built-in diode in the battery clip to help reverse charging.-You can install it in the car and continue charging during the day.solar panel5. Dual reverse current protection, low heat generation.4. Built-in short circuit protection, open circuit protection, reverse protection, over protection.1 battery clip-Waterproof and can be placed outdoors.1. Built-in industrial microchip.-Spare chargers for cars, trucks, caravans, ships, motorcycles, RV batteries or any 12V - batteries.DC output: 18Vsolar panel-Power: 20W-3. PWM battery charging.1 solar panelProduct size: 210 X175X2.5mmPacking size: 250 X200X35mm1 car chargerUSB output: 5V-Provide 1 battery clip and 1 charging cable for various equipment, emergency lights, advertising lights, traffic lights, electric fans, solar water pumps, motorcycles, ships, etc.Panel: Monocrystalline silicon6. System control parameters are adjustable.2. Large LCD screen with adjustable parameters.Weight: 300g