POTENTIAL INDUCED DEGRADATION (PID) / HIGH VOLTAGE STRESS
PID/HVS effect description
Crystalline silicon P-type solar panels connected in strings to transformer less inverters in operation are exposed to a negative potential to ground. Depending on their position in the string, a different high electric potential between solar cell and panel frame appears and causing a leakage current flow from the cell to frame/structure to ground.
This effect has a deep impact on the power productivity of the solar panels and to the energy yield of PV power plants.
Depending on the installation design and environmental conditions of the PV System, The solar panels can reach degradations up to 30 % or even up to 80 % in specific cases.
The required temperature should be higher as 10°C and the humidity higher as 60% .