PID solutions overview
An important issue in the PV sector is Potential Induced Degradation or PID, the deterioration of solar panels due to the high voltages that occur during the day and cause leakage currents to the earth. This phenomenon has been known for some time and is the reason why manufacturers guarantee a declining return as the installation ages.
This article shows an overview of possible PID solutions.
PIDbox Mini = to cure and to prevent from PID
Patented solution in series
More information on 100% recovery: Eliosys test and TUV Rheiland recovery test
PIDbox Mini = to prevent from PID
Grouding
Inverter before 2008: grounding is possible. Replacing all panels with PID is necessary, because there is no recovering from panels by a PIDbox. Still problems at large PV plants because of the grounding difficulties.
Inverter after 2008: inverters provide a higher efficiency, but no longer have a transformer. So grounding on the negative site of the inverter is impossible.
Even if solar modules need grounding (e.g. Sunpower), an inverter with transfomer can be replaced by a tranformerless inverter with a PIDbox included.
Leave a Reply