Electroluminescence test shows PID on Scheuten Solar solar panelIlumen
Because of Potential Induced Degradation (PID), solar panels can suffer from yield losses up to 70%. iLumen developed the PIDbox, a device that increases the efficiency of solar panels affected by PID and extends their life.
On many Flemish rooftops, solar panels of the bankrupt Scheuten Solar manufacturer are installed for a total capacity of 50 to 60 MWp. These panels seem to be signicantly affected by PID.
iLumen performed an electroluminescence (EL) test on some monocrystalline Scheuten Solar (P6-60i30) solar panels of 230Wp, which were put in operation 5 years ago. Solar panels that are free from PID, show a pattern in which all cells have the same brightness. This is clearly not the case for the Scheuten Solar model that was tested by iLumen (Figure 1). Some cells are no longer or not completely illuminated, which is a clear sign of the presence of PID.
The Scheuten Solar solar panels are affected by PID and therefore suffer from significant efficiency losses. The efficiency of the worst solar panel investigated equals 48,7% of its initial value, only after 1,5 years.
Figure 1: Scheuten Solar panel with PID
Figure 2 shows the results of the EL-test that was performed two weeks after the installation of the PIDbox of iLumen. As can bee seen, all cells are completely illuminated and almost equally bright. Three months after installing the PIDbox, the efficiency of the Scheuten Solar solar panel increased to 99,6% of the initial value.
Figure 2: Scheuten Solar panel two weeks after PIDbox installation