What is the PID effect on solar modules

In order to obtain “PID-free” certification in accordance with this standard, manufacturers must carefully select module components and optimize their production processes.
 
In PID tests, solar cells are exposed to exactly the conditions under which this phenomenon occurs: high temperatures and a high electrical potential between the glass surface and the solar cell. The test conditions are 60 °C (140 °F) ambient temperature and 85% humidity, with a negative potential of 1000 V for a duration of 96 hours. The cells must not show a power decrease of more than 5%.
 
For this purpose, aleo carries out extensive internal tests with even stricter criteria. For the approval of new module components, aleo is only permitted to degrade significantly less than specified in the standard. These internal quality controls have proved to be effective in external test laboratories, and aleo modules, which have passed the tests for years with a result of less than 1% performance degradation, have continued to improve.

In a series of PID tests conducted by Fraunhofer ISE in December 2019, no aleo module achieved a PID percentage greater than 0.67%.
 
During the PID tests last December, the new aleo X63 panel even achieved an astonishing degradation rate of 0.37% of the output power.