The Siemens ST40 solar (photovoltaic) module uses Siemens Solar´s industry-leading Copper Indium Diselenide (CIS) thin-film technology to efficiently create electricity from sunlight.

36 PowerMax® solar cells form the heart of the module. These cells make optimum use of the module surface area. Thanks to their square shape, they are highly efficient and still provide the maximum power possible even under low light level conditions. The specially hardened front glass has excellent light transmitting properties and protects the module against most adverse environmental conditions such as hail or ice. The solar cells are laminated in EVA (ethylene-vinyl acetate) between a multilayer rear film and the front glass.