Ramsond&reg; 20 Watt 20W W Solar Panel Module 12V Nominal Output RV Boat Battery Charger Charging Trickle Boat 20 Watt Solar Panel 12V Nominal Voltage Vmp: 17.6V Voc: 21.8V Imp:1.14A Isc:1.25A Grade A Solar Cell 17% Efficiency Heavy Duty Frame with Mounting/Drain Holes Rear Mounted Waterproof Junction Box with Sliding Access Cover