In the production and installation of photovoltaic (PV) modules, the sealing of the backboard frame and the bonding of the junction box are crucial steps. High-quality silicone sealants with strong adhesion and excellent sealing properties are usually used for encapsulation. If this step is not done properly, what impacts can it have?
1. Infiltration of Destructive Liquids and Gases
PV panels are exposed to the external environment for long periods, making it easy for rainwater and dust to penetrate the interior. If the sealing is not done correctly, it can lead to corrosion of the solar cells, affecting the power generation efficiency of the PV panels and potentially causing damage.
2. Impact on the Integrity of PV Panels, Reducing Their Operational Lifespan
The tightness between PV components can enhance their ability to withstand external forces. If the components are poorly sealed and the bonding is not firm, it can cause loosening or aging of the panels, significantly reducing the lifespan of the entire module.
Reasons for Substandard Sealing Performance
Why does the bonding and sealing performance of PV modules sometimes fail to meet the required application standards in solar PV systems?
1. Substandard Quality of Sealant
Sealants that crack or lose adhesion after curing directly or indirectly compromise the airtightness of PV module cells. Some low-quality sealants, due to poor raw materials and failing to meet basic requirements, may pose safety hazards.
2. Issues with the Sealant Application Method
The amount of sealant applied and the method of application can affect the subsequent sealing effect. For example, insufficient sealant, bubbles in the adhesive, or an inadequately cleaned bonding surface can all result in poor sealing.
3. Poor Performance of the Sealant
Silicone sealants used in PV modules must meet stringent performance requirements, especially in terms of weather resistance and tolerance to high and low temperatures. If these requirements are not met, a series of problems can arise after a period of use.
Conclusion
Therefore, choosing a high-quality, high-performance, and warranty-backed sealant for the bonding and sealing of PV modules is essential. Additionally, attention must be paid to correct sealant application procedures during construction to ensure the best sealing performance of PV modules, thus reducing subsequent issues and improving power generation efficiency.