PV system and module supplier Mage Solar has revealed that its Powertec Plus module range was certified against potential-induced degradation (PID) by Underwriters Laboratories (UL) at the end of 2011. This test, which vouches for the modules’ insensitivity to power losses due to high voltages, temperatures and humidity, was carried out at UL’s Neu-Isenburg facility at the end of the year.