PI Berlin becomes an approved testing institute for First Solar modules (WK-intern) - Thin-film module test results approved by the manufacturer The Photovoltaik-Institut Berlin (PI Berlin) has been accepted as an independent testing institute by the thin-film module manufacturer First Solar. The manufacturer officially recognizes the institute’s performance and condition testing of Cadmium Telluride (CdTe) thin-film series 4 modules. Customers can therefore rely on the independent testing conducted by PI Berlin, an institute with recognized expertise in thin-film technology and manufacturing. “We are pleased to recognize PI Berlin as an approved testing institute,” said Lou Trippel, First Solar’s Vice President of Product Management. “It