P.I.D. VERIFICATIONS

VERIFICATION OR RECOVERY OF PID

Potential-induced degradation (PID) is a potential-induced performance degradation in crystalline photovoltaic modules, caused by so-called stray currents. This effect may cause power loss of up to 30 percent. The cause of the harmful leakage currents, besides the structure of the solar cell, is the voltage of the individual photovoltaic (PV) modules to the ground. In most ungrounded PV systems, the PV modules with a positive or negative voltage to the ground are exposed to PID. PID occurs mostly at negative voltage with respect to the ground potential and is accelerated by high system voltages, high temperatures, and high humidity.
To verify the presence of this problem, Ecoprogetti has put together a kit to simulate the condition that stimulates PID in forward or reverse polarization. This kit can be used to test the module or recover it after exposure. With this kit the module manufacturer can be more confident regarding the performance warranty given for the modules and new raw material can be tested before qualifying them for the production process.