Over its years of operation, the system voltage of a PV power generation system will cause power output of crystalline silicon cell modules to degrade. Crystalline silicon cell modules manufactured based on screen printing, with the help of encapsulation materials (EVA or glass), produce a circuit along the module frame, causing current to diverge. This explanation is considered the main cause of PID. In extreme cases, this issue causes module power to degrade by more than 50%, affecting power output of the entire power plant.
Humidity is a main cause of PID, so Seraphim focuses on its encapsulation technique and quality backsheet and EVA material selection in order to reduce the rate of moisture vapor transmission. By selecting quality raw materials and optimizing processes, the content of acetic acid in EVA is decreased, which helps to minimize PID.