For the solar panel array, thin film panels, also called CIGS solar panels, are used. These panels are very applicable because they are bendable and can be produced in a more sustainable way than silicon cells. CIGS panels have a lower efficiency at the moment, but a lot of research is devoted to this technology because they have a lot of potential. With the aid of special devices (MPPTs), the maximum power that can be delivered by the panels is extracted, and this depends on for instance temperature and illumination. This is how the energy from the sun is retrieved and transformed into electricity.