In a major operation last week, the prototypes of solar integrated roof tiles, made by Korean Roser are installed at SolarBEAT, the TNO outdoor test facility for solar modules at the Eindhoven University of Technology. This test is another important step towards commercial application of aesthetic integration of thin-film solar technology.    The roof tiles of Roser are made of steel. They are relatively light weight and easy to install. Using steel has several advantages, like weight, costs...