The photo-voltaic modules are composed of various components that surround the solar cells; whose function is to protect them from external agents. Such is the case of the EVA encapsulant.
What is the EVA?
EVA is ethylene vinyl acetate, a material that has good radiation transmission and low degradability to sunlight. This is a thermoplastic polymer, which is used in solar modules as an encapsulating agent since, by applying heat to the assembly, it forms a sealing and insulating film around the solar cells. It prevents the entry of air and the formation of moisture, lets the sun’s energy go through while being resistant to sunlight degradation over time.
What happens if the EVA is of poor quality?
Solar cells are made of silicon. This chemical element has a tendency to react to other molecules; among its favourites is oxygen. If the EVA is of poor quality or the lamination process was not done correctly, the silicon wafer will come into contact with water or air (both very rich in oxygen) and the panel will begin to oxidize, looking yellow or brown depending on the case.
The consequences? The panel has lower efficiency, which will reduce the efficiency of the entire system.
The solution? Replace the panel with a new one.
How can you avoid this?
Work with a solar panel supplier that uses EVA brands with certified quality, and with a strict Incoming Quality Control (IQC) process to test each raw material received. That is why in ECO GREEN ENERGY we make sure to work with the best brands for each component of the panels and even for the machinery of our factory.
Our lamination process is in vacuum, with a temperature of 152 ° C for 19 minutes, encapsulating all the components so that no air or humidity will enter in contact with the cells.
Our EVA provider is SVECK, a brand that also works with companies such as Luxen Solar and Jinko Solar. It has TUV, SGS, VDE, ISO certification. The EVA we use has a thickness of 0.5mm and a weight of 420g / m2 while other brands work with 390g / m2, which could decrease the cells lifetime.
In addition, our rolling machine is from BOOSTSOLAR PV brand, experts in the manufacturing of this type of machinery, certified with ISO 9001 and CE, and with worldwide sales, covering the main markets of Europe (Germany, Spain and Italy), USA, Brazil, Japan, etc…
In Eco Green Energy we also carry out double EL test before and after the lamination process to verify that everything is in perfect condition and we offer our customers a certified quality product, because we care.
If you have any questions about our quality control, you can write to firstname.lastname@example.org and we will gladly answer all your questions.