The economic success in operating photovoltaic systems depends essentially on the possibility of their long-term operation and delivery of the expected energy yield. Twenty to twenty-five years are often presupposed. These are high demands. A precondition is the good quality and long-term stability of the employed products, in particular the PV modules, as well as all other components and materials, and the non-appearance of damages to these items during transport and handling. In addition, the...