Application cases of photovoltaic EVA film in double glass modules

Application cases of photovoltaic EVA film in double glass modules

EVA film is the core material for photovoltaic module packaging. In double-glass modules, it plays multiple functions such as bonding glass and cells, blocking water vapor, and resisting UV aging. Since the double-glass module uses a glass backsheet instead of the traditional organic backsheet, the overall structure is more weather-resistant, but it places higher requirements on the bonding durability and potential-induced attenuation resistance of the adhesive film. Therefore, the selection of the adhesive film and the packaging process directly determine the long-term power generation performance of the module.

In terms of large-scale ground power stations, multiple 100-megawatt power stations in the desert areas of northwest my country use double-glass modules encapsulated with PID-resistant EVA film. The local temperature difference between day and night is large, the wind and sand are strong, and the ultraviolet radiation is intense. Operation data shows that after several years of outdoor operation, the power attenuation of modules using optimized formula film is significantly lower than that of conventional products, and the phenomenon of snail lines and cell crack expansion is significantly reduced.

In the field of surface photovoltaics, the environmental humidity of fishery-solar complementary projects in Shandong, Zhejiang, Anhui and other places is extremely high, and water vapor intrusion is the main cause of component attenuation. Such projects generally use EVA film with high volume resistivity and low water vapor transmission rate combined with a double-glass structure. The power retention rate after the humid heat aging test is excellent, and the long-term reliability has been fully verified.

In agricultural and solar complementary and industrial and commercial distributed roof projects, double-glass modules are widely used due to their advantages of high fire protection level, strong load capacity, and long life cycle. The high transmittance EVA film ensures the effective realization of double-sided power generation gain. In some power stations, the double-sided gain can reach more than 10%. These cases illustrate that scientifically matching the performance of EVA film and the double-glass packaging structure is a key link in improving the revenue and reliability of power stations.