Photovoltaic panel defects news release

What is PV panel defect detection?

The task of PV panel defect detection is to identify the category and location of defects in EL images.

What are the different types of defects in PV panels?

As illustrated in Fig. 1, the common types of defects in PV panels include crack, finger interruption, black core, thick line, star crack, corner, horizontal dislocation, vertical dislocation, and short circuit often accompanied by complex background interference. However, defect detection in EL images requires highly specialized knowledge.

Can a real-time defect detection model detect photovoltaic panels?

Efforts have been made to develop models capable of real-time defect detection, with some achieving impressive accuracy and processing speeds. However, existing approaches often struggle with feature redundancy and inefficient representations of defects in photovoltaic panels.

What is the average temperature increase in defective PV modules?

We also observed an average temperature increase of 21.7 °C in defective PV modules. Additionally, two PV assets with 19.25 and 8.59% thermal defects were examined for PV degradation, and results revealed a higher degradation rate when more defects are present.

What percentage of PV modules are thermally defective?

A total of 36.6% of all PV modules inspected are thermally defective, while 63.4% are defect-free. It has been found that over 900,000 PV modules have been affected by either single hotspots or multiple hotspots. PID defects are found in 0.28% of PV modules inspected, resulting in 9280 defective panels.

Are thermal defects affecting PV installations' yearly output power?

However, the degradation rate of both PV installations is higher than the UK degradation rate estimated previously by 2, with an average between −0.8%/year or −0.9%/year. This comparison demonstrates the substantial effect of thermal defects on PV installation’s yearly output power.