20 Watt Rollable Solar Panel Because PowerFilm® integrated solar panels (thin film on plastic) are developed and manufactured with a proprietary roll-to-roll process, by Iowa Thin Film Technologies, they are truly rollable unlike other thin film technologies that are only somewhat flexible. PowerFilm® solar panels are monolithically integrated which eliminates the need for damage-prone manual connections of individual solar cells. PowerFilm® is made of silicon, a natural resource in abundant supply. Also PowerFilm® performs well in diverse enviroments, including hot sun, and does not suffer from wasted over-voltage. Cadmium Free. The 20 watt panel operates at 15.4 Volts @1.2A it is 305mm X 1858mm