Solar modules - assembly of multiple layers, photo: dowcorning.com
Solar modules - assembly of multiple layers, photo: dowcorning.com

Solar module assembly - layers of solar panels

Solar module assembly. Solar modules consist of multiple layers. Besides the power producing layer of solar cells, the structure of solar modules also has to allow for stability and corrosion protection.

 

Here are the different layers of a photovoltaic solar module:

 

    • face-plate (ESG)

The first layer is a 4mm thick ESG glass plate (safety glass), which is not only impact-, pressure- and temperature-resistant, but also shock-proof. For area loads in snow and wind load zone 3, values of 5400 N/m2 should be adhered to. Applying an anti-reflective coating to the cover glass will reduce reflections and increase the module's output power.

 

    • upper encapsulating film (EVA)

A plastic layer made from EVA (ethylene vinyl acetate) or a cast resin layer is inserted as the upper moisture barrier. The plastic films are welded (laminated) onto the solar cells at temperatures around 150°C forming a water-proof corrosion protection.

 

    • solar cells

Single solar cells, interconnected with each other, produce elecctric power.

 

    • lower encapsulating film (EVA)

A plastic layer made from EVA (ethylene vinyl acetate) or a cast resin layer is inserted as the lower moisture barrier. The plastic films are welded (laminated) onto the solar cells at temperatures around 150°C forming a water-proof corrosion protection.

 

    • Tedlar laminated film

A plastic layer made from polyvinyl fluoride, better known under the trade name Tedlar and ICOSOLAR, or a glass plate is used as finish on the back side.

 

    • Frame

To give stability to the different layers and to facilitate the assembly, the module is enclosed in an aluminum frame.