High-Efficiency Defect Detection for PV Systems: Principles of EL Detector and Advantages of Portable Rapid Tester

As the core equipment for defect detection of crystalline silicon solar cells, the EL detector applies a specific forward bias voltage to the crystalline silicon solar cell during detection. The core purpose of this operation is to simulate the equivalent DC current environment generated inside the cell when it is irradiated by sunlight in actual outdoor work. When current flows inside the cell, the cell follows the reverse process of the photoelectric effect and emits infrared light with a wavelength of approximately 1100 nm. This type of light is invisible and cannot be directly detected by the naked eye. However, the EL detector is equipped with professional photosensitive components that can accurately receive and convert these infrared signals, ultimately generating a clear image of the internal structure of the cell.

In the generated detection image, the brightness difference in different areas directly reflects the internal quality of the cell. Darker-colored areas indicate that the recombination efficiency of electrons and holes in this part is low and the quantity is small under the action of current. This is usually a direct manifestation of defects such as hidden cracks, impurities, or structural abnormalities in the cell. By analyzing the location, shape, and distribution pattern of these dark areas, technicians can quickly and accurately locate potential problems such as hidden cracks inside the cell, providing a reliable basis for subsequent maintenance or quality control.

The Photovoltaic Panel Hidden Crack Rapid Detection Instrument is a specialized device developed for the detection scenario of outdoor photovoltaic modules, especially suitable for defect analysis in complex outdoor environments such as large-scale photovoltaic power stations and distributed photovoltaic rooftops. It can not only accurately identify common obvious defects in photovoltaic modules, such as grid breakage, hidden cracks, and fragments, but also truly realize the "inspection while walking" detection mode relying on its lightweight design and convenient operation method. This device does not require multi-person collaboration; a single person can complete the entire set of detection processes, significantly reducing labor costs and operational thresholds.

To further improve the detection experience and efficiency, the Photovoltaic Panel Hidden Crack Rapid Detection Instrument can be used with a high-definition short-wave camera. With the help of wireless connection function, staff can view dynamic EL images in real time on the screen of mobile devices such as mobile phones or tablets, without frequent bending over or adjusting the device angle. This not only reduces work intensity but also allows for clearer observation of component details. Practical application tests have shown that its detection efficiency is more than 5 times higher than that of traditional fixed detection equipment. In outdoor single-point detection, it can significantly shorten the detection time, providing efficient and convenient technical support for regular inspection, fault troubleshooting, and maintenance of photovoltaic power stations, and effectively ensuring the long-term stable operation of photovoltaic modules.