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A solar module is made up of many parts that safeguard or extend the life of the solar cells in addition to the solar cells themselves. A basic module is made up of a glass sheet, a frame around the edges, and an EVA sheet over the solar cells. Afterward, a tough and long-lasting EVA sheet is used to cover the cells’ lower side once more. The back sheet completely encloses it.
Moisture, oxygen and the environment can all damage solar cells. A solar module’s EVA stops air and moisture from getting to the solar cells and deteriorating them. The solar cells will deteriorate over time and stop producing electricity if they are not covered.
What are EVA Films?
Ethylene vinyl acetate is a thermoplastic polymer with low photo-degradability and high radiation transmission. It is utilised in the photovoltaic (PV) sector as a crystalline silicon solar cell encapsulation material in the production of PV modules. Solar EVA Film provides long-lasting protection for solar panels with minimal performance degradation.
A rubbery material with a milky white color makes up a Solar EVA sheet. It transforms into a clear protective layer when heated, sealing and insulating the solar cell. The cells are laminated between films of EVA with the aid of a lamination machine in a vacuum that is compressed at temperatures of up to 150 C.
EVA Film Properties:
Quality EVA film is renowned for its outstanding endurance, even under challenging environmental conditions like high temperatures and high humidity.
EVA film will have great adhesive adhesion to solar glass under the correct conditions (NOT standard glass, solar glass has a rough surface). EVA also adheres to the back sheet extremely effectively.
Excellent transparency is a hallmark of EVA. This indicates that the optical transmission is satisfactory and does not significantly obstruct the sunlight trying to reach the solar cells. These days, a number of Asian producers use a translucent backing, which results in transparency between the cells. Semi-transparent modules are this kind of module.
Despite some of the long-term dependability issues we have raised, EVA has a long history of being the most used encapsulant material for PV modules. This is due to the fact that it offers a cost-effective solution that satisfies requirements for mechanical strength, weather resistance, and stability set by the industry.
The present market trend demonstrates that the majority of businesses continue to employ EVA as their encapsulant material. However, it is exciting to see that some companies have already started using POE and EMA as viable EVA alternatives in their solar modules.
PIXON, one of the topmost solar EVA film manufacturers makes highly robust films for the long-lasting and efficient performance of the solar modules. PIXON has a 1 GW turnkey manufacturing capacity for EVA films. With higher productivity and lower shrinkages, our EVA films ensure that the solar cells are protected and solar modules provide better performance even while facing the utmost harsh weather conditions. EVA films are also preferred because of their ease of lamination.