The solar cells are located between two sheets of tempered glass in a concrete housing. The results of the mechanical and thermal tests of the prototype show that the elements are able to withstand everyday use very well. The glass surface can also resist large impact loads. Damage caused by vandalism, however, can never be ruled out. We use safety glass. When this type of glass breaks, it will break in the form of a lot of small pieces. There will be no dangerous shards. Moreover, the glass remains in its place due to the coating on the surface and the frame. Thus, even when the glass is broken, it can still be safely walked and cycled on, until repair can take place.