EVA(Ethylene Vinyl Acetate) is an encapsulant for solar Cells/ Modules.
It is a copolymer film which acts as an essential sealant of photovoltaic solar modules for ensuring the reliability and performance.
Encapsulant sheets play an important role in preventing water and dirt from infiltrating into solar modules as well as protecting the cell by softening the shocks and vibrations to the cell. They should possess certain properties like excellent durability,adhesive bonding to the cell and glass, excellent optical transmission and transparency and flexibility. Cells are encapsulated before being laminated with glass and the backsheet.
So, in a typical solar module, you have the glass on top, an EVA sheet after that, followed by the cells, one more layer of EVA sheet below the cell, and finally the backsheet.
You thus typically have two layers of EVA-based encapsulants in a solar module.
Source: EVA from Solar Mango’s Solar Dictionary
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