Quality issues that PV modules often encounter

Photovoltaic modules produce electricity when illuminated or illuminated by other sources. Take appropriate precautions when handling, to avoid direct contact with people with 30V DC or higher. Solar photovoltaic modules convert light energy into DC power, and the amount of electricity varies with light intensity.

Let’s take a look at the quality issues that PV modules often encounter:

1.Power attenuation classification and detection method:

Quality issues that PV modules often encounter

PV module power attenuation refers to the phenomenon that the output power of the component gradually decreases as the illumination time increases. The power attenuation of photovoltaic modules can be roughly divided into three categories: the first category,z profile component power attenuation due to destructive factors; the second category, the initial photoinduced attenuation of components; the third category, the aging attenuation of components. Among them, the first type is the controllable attenuation during the installation of photovoltaic modules. For example, strengthening the unloading, reversing, and installation quality control of photovoltaic modules can reduce the probability of cracking and chipping of component cells. The second and third categories are the technical problems that need to be solved in the production process of photovoltaic modules. PV module power attenuation testing can be done with the PV module I-V characteristic tester.

2.Hot spot formation causes and detection methods:

The hot spot of the photovoltaic module means that the component is not exposed to sunlight due to the sunlight, so that the covered part heats up much more than the uncovered part, causing the burnt dark spot to be overheated. The formation of hot spots of photovoltaic modules is mainly composed of two intrinsic factors, namely internal resistance and dark current of the cell itself. The hot spot endurance test is a test for determining the ability of a solar cell module to withstand hot spot heating effects. The solar cell module is tested by a reasonable time and process to indicate that the solar cell can be used for a long period of time under specified conditions. Hot spot detection can be detected by an infrared camera. The infrared camera can use thermal imaging technology to display the measured target temperature and its distribution in a visible heat map.

3.Causes of crack formation and detection methods:

The crack is a small crack in the battery. The crack of the battery will accelerate the power attenuation of the battery and affect the normal service life of the component. At the same time, the crack of the battery will expand under the mechanical load, which may cause open circuit damage. Cracking can also cause hot spot effects.