Why PDI test is important in Solar Panels for Projects ?

PDI test 

A Potential Induced Degradation (PID) test is a quality assurance test for solar panels that simulates high voltage, temperature, and humidity conditions to predict how much power the panel will lose over time. This test is critical because PID can significantly reduce the efficiency of solar panels, sometimes by 30% or more, due to current leakage between the solar cell and the grounded frame. The PID test helps manufacturers ensure that their panels will perform reliably throughout their lifespan.

How the test works?

• Simulates operating conditions: The test exposes the solar module to accelerated conditions that mimic real-world exposure, often using a high-temperature and high-humidity chamber. 

• Applies high voltage: A high voltage is applied between the solar cell circuit and the grounded frame of the module. 

• Measures power loss: The test measures how much power output the panel loses under these stressed conditions, which indicates its susceptibility to PID. 

• Duration: A standard PID test may last for 96 hours, as described in standards like IEC 62804. 

Why PID testing is important? 

• Prevents efficiency loss: PID can cause significant power loss, so testing helps identify and prevent panels that are prone to this issue before they are sold. 

• Ensures long-term performance: It provides assurance that panels will continue to produce power efficiently for many years, safeguarding the investment in a solar system. 

• Avoids economic impact: By ensuring quality, PID testing helps prevent the financial and operational impact of underperforming solar projects.