Image: Roof Tile Technology Ltd. The flat, dark grey, BiSolar tile has a power output of 18 W and efficiency of 17.5%, according to the manufacturer. “For each square meter, 9.7 tiles are needed ...

The tiles, available in two colours, a dark obsidian color, and a more classic roof-color Terra-cotta. More colours will come to the market as well. The tiles come with a 30-year warranty and ...