80w Solar Panel Dual 12v/5v USB with20A 60A Controller Waterproof Solar Cells Poly Solar Cells for Car Yacht RV Battery Charger

  Can not measure nearthe window, need sunlight Direct shot. Controller connection steps:(the Last picture) 1. Connect the positive and negative poles of the battery , the controller will detect the battery voltage automatically ; 2. Connect the solar panel to the controller; 3. Connect the load as show , don't connect it reversely; Features: * Used to charge MP3 phones, pads or other controlled devices. * Dual female USB ports, you can easily charge the device through the * USB charging cable. * You can put the panel in the sun and use it to directly charge the device. * Suitable for outdoor biking, mountaineering, hiking, camping, traveling, etc. Specification: Solar panel power: 100W Solar cell: Polycrystalline silicon Solar panel size: 435*200*3mm Solar panel operating voltage: 18V Solar panel open circuit voltage: 21.6V Solar panel short circuit current: 0.55A (Max) Output port: Dual USB, DC5521 female Product features: integrated 5V voltage regulator module Product use: charge 5V devices such as mobile phones and sports cameras, and charge 12V car batteries such as cars and boat