TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The channel is formed by molding in the structural plate, and a recess is formed on a surface of the structural plate, facing the rear sheet and an elevation is formed on the surface of the structural plate, facing away from the rear sheet. A coolant line is formed through the channel and the rear side. The coolant inlet and -outlet are arranged on at least one side edge of the structural plate, preferably on two opposite side edges, and the channel is meandered. The structural plate is made of at least steel and/or aluminum, and has a thickness of 0.1-3 mm, preferably 0.3-0.8 mm and the thickness of the structural plate is constant. The channel has a depth of 0.5-20 mm, preferably 2-10 mm and a width of 2-50 mm, preferably 5-20 mm. The structural plate is connected with the rear sheet by an adhesive, preferably a polyurethane adhesive. At least one fastening element is arranged on the surface of the structural plate, facing away from the rear sheet. The photovoltaic layer system comprises at least one photovoltaically active absorber layer between a front electrode layer and a rear electrode layer and the photovoltaically active absorber layer comprises at least polycrystalline silicon or copper-indium(gallium)-sulfur/selenium. The photovoltaic layer system is arranged on a front of the rear sheet. The arrangement comprises a pump for pumping the coolant through the channel, the coolant supply, the coolant return line and the coolant-cooling system. The coolant-cooling system comprises at least one pipe extending between the coolant supply line and the coolant return line. Preferred Method: The method, between the steps (ii) and (iii) further comprises: connecting the coolant supply line with the coolant inlet; connecting the coolant return line with the coolant outlet; connecting the coolant supply line with the coolant outlet of the coolant-cooling system; and connecting the coolant return line with the coolant inlet of the coolant cooling system. The step (c) includes at least partially filling the channel, the coolant supply line, the coolant return line and the coolant-cooling system with the liquid coolant.