Using EVA photovoltaic encapsulation film For Industry can protect the module from the risk of potential induced degradation (PID). The PID effect is defined as the power degradation caused by the application of high voltage between the solar cell and the photovoltaic module frame. The PID effect not only causes the degradation of photovoltaic modules, but also causes the failure of crystalline silicon solar modules, which will cause irreversible losses in actual production applications and have a huge impact on production capacity. The PID effect has been proven to cause serious power degradation and rapid power failure problems in bifacial photovoltaic modules and systems.
The aging deacetylation reaction of EVA encapsulation film generates acetic acid, which reduces the pH of the film and accelerates the corrosion rate of the module surface; the acid radical ions generated by aging cause the migration of Na+ in the glass layer, thereby inducing the PID effect. In view of the mechanism of Na+ migration inducing the PID effect of crystalline silicon modules, the anti-PID modification of EVA encapsulation film mainly includes two aspects: first, inhibiting EVA aging; second, reducing the internal ion mobility of EVA encapsulation film to prevent the PID effect caused by Na+ migration.
EVA photovoltaic encapsulation film For Industry is modified to develop high-performance anti-aging EVA encapsulation film. Appropriate addition of antioxidants, ultraviolet absorbers, cross-linking agents, etc. can significantly improve the durability and weather resistance of EVA encapsulation film. EVA encapsulation film with high volume resistivity means that the ion mobility in the film is very low, and leakage caused by poor insulation can be alleviated by increasing the volume resistivity. Drying the film, such as plating a hydrophobic coating on the surface, improves the cross-linking degree and crystallinity of the film. In addition, a higher EVA cross-linking level and a higher EVA encapsulation film thickness will also inhibit the PID effect. The EVA cross-linking level is closely related to the type and amount of cross-linking agent and co-cross-linking agent.
EVA photovoltaic encapsulation film For Industry effectively reduces the risk of photovoltaic modules being affected by the PID effect through a series of technical means, thereby extending the service life of photovoltaic modules and improving their power generation efficiency.