The 20W Solar Maintenance Charger is suitable for maintaining 12V automotive batteries from self discharge during storage or inconsistent use. Thanks to the 20W solar panel technology it also works in cloudy and winter conditions so is suitable for use all year round. Includes suction caps for mounting, 12V adaptor and alligator clips.Features:1.Light weight,easy carrying,easy shipment,easy installation.2.make with high efficiency Monocrystalline silicon and solar panel up to 20%.3.wide use applications:Golf car,Yacht, boat,caravan, electric car, patrol car,camping,tent,portable bag , portable generator kits etc.SpecificationSolar panel power: 20WSolar cell: Monocrystalline siliconSolar panel size: 420*280*3mmSolar panel operating voltage: 18VSolar panel open circuit voltage: 21.6VSolar panel short circuit current: 1.11A (Max)Output port: Dual USB, DC5521 femaleProduct features: integrated 5V voltage regulator moduleProduct use: charge 5V devices such as mobile phones and sports cameras, and charge 12V car batteries such as cars and boat