Some common quality problems of solar panels

The common quality problems are: everyone may find that most of the solar panels around us are placed diagonally, whether it is on the roof or on the street lights, there is a certain angle of inclination. The tilt angle of the solar panel is related to the local geographical location and latitude.
1. Silica gel and EVA residues on the light-receiving surface of the components are not cleaned in place, causing the adhesion of outdoor dust, which is easy to cause hot spots to damage the components.
2. Welding
The welding area of ​​the circuit inside the module is too small. Under the influence of high and low temperature alternating, it is easy to cause connection failure under harsh weather conditions, which will eventually lead to a significant drop in the power of the module.
When the battery is soldered, the improper use of the flux will cause the EVA to react with the flux, forming a large number of white spots on the surface of the battery, and the power of the module will be greatly reduced.
3. Bubbles
There are obvious bubbles in the module. After long-term use, the area of ​​the bubbles will increase and even a continuous bubble channel will be formed, which will cause the power of the module to drop and eventually make the module unusable.
4. Improper use of flux
Misuse of flux. There is a lot of flux residue on the surface of the cell, and it is not treated before packaging, and there is still corrosion after packaging, which will easily cause the ribbon to turn green, increase the resistance of the module, and reduce the power of the module. In addition, when the pH value of the residual flux is small, it may also react with EVA to produce yellowing, resulting in a decrease in component power.
5. Battery slice classification
The power and current of the cells in the module are inconsistent, and the difference between the actual output power of the module and the theoretical power of the module is too large. Inconsistent binning will result in abnormal component electrical performance test curves, resulting in hot spot effect, and long-term use will greatly reduce component power.

6.

Cracked cell

There are cracked cells in the module, and their power is slightly lower than that of normal modules of the same specification. During long-term use, the hidden cracks will intensify and extend, causing more area to be reduced from the module circuit. At the same time, it will cause a hot spot effect, causing Components hot spots or even burn out.

7. There are internal defects or pollution when the battery is selected

Cell defects will be exposed during long-term use, resulting in a significant drop in module power. The selection of cell manufacturers is very important. In addition, module manufacturers should also be equipped with relevant testing instruments, such as EL sorters, EL testers, etc., to reduce the flow of problematic cells into the production process.

8. Unreasonable lamination

If the lamination temperature is too high and the lamination time is too long, the yellowing and aging coefficient of EVA will increase after the module is subjected to high temperature. Long-term outdoor use will cause yellowing of auxiliary materials such as EVA and backsheet, which will eventually lead to high power generation of the module. Decrease in magnitude.