Choosing PV modules, you should be very attentive to each detail, as they may disrupt the performance of your solar installation. Last time, we discussed the Snail Trail effect and how it can affect the PV modules, you can read more here.
Today, Eco Green Energy would like to highlight the problem of EVA delamination and share with you what it is, why it appears, and how to prevent such an effect on your solar panels.
Back to the production part
A PV module has a multi-layer structure that is sealed by an encapsulated, often based on Ethylene Vinyl Acetate (EVA). The manufacturers use a laminator machine to melt together all the layers in one piece. The laminator has a working cycle lasting less than 20 minutes at a controlled temperature of approximately 140 C in a vacuum.
During the lamination, the EVA changes from a solid state to a liquid one, settling in the form of a gel at the end of the cycle.
The percentage of the EVA gel determines how long layers sealed together will serve this way, guaranteeing the power output of the PV modules for a long time.
Common causes of EVA delamination
Even though manufacturers protect PV modules with a layer of tempered glass and a plastic back sheet, there is possible delamination of solar panels. Usually, the process starts at one angle or a side of the panel and then spreads across the PV module. The start of delamination is possible to determine by bubbles and creases on the plastic rear surface. Some owners try using duct tape and sealant to slow the process down, but such a panel isn’t going to last long.
Here are some possible reasons why EVA delamination happens:
- Poor manufacturing, such as the low temperature of the laminator or short time laminating time;
- Bad raw material production, such as allowing foreign matter to be on the surface of solar photovoltaic module raw materials such as EVA, glass, and back sheet;
- The uneven composition of the EVA raw materials (such as ethylene and vinyl acetate) of the solar photovoltaic module;
- High temperatures outside (delamination often occurs in tropical climates, and semi-flex panels are especially vulnerable).
How to prevent EVA delamination
There are some tips on what you need to be sure of when buying solar panels. Firstly, choose a trusted manufacturer that strictly controls the temperature, time, and other significant parameters of the laminator, and regularly conducts the crosslinking degree test according to the requirements.
Another thing is to make sure of the quality of raw material suppliers and raw material inspection.
With a strict choice of raw materials, accurate production processes, and double EL tests, Eco Green Energy ensures customers with the highest quality solar modules under safety and necessary security standards.
Moreover, our manufacturing process integrates EMS Tracking in all our panels, the panel prior to being delivered it’s assigned an ID, and each test result is archived within the respective ID and kept the records for more than 10 years. According to the Packing List of each delivery, we provide QC reports and Certifications to our customers.
Eco Green Energy is always here as your most reliable solar partner!
Feel free also to contact us for more information: info@eco-greenenergy.com
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For more information about our PV modules, also visit our product page.
