Delamination is damage to the panels by degrading the EVA (ethylene vinyl acetate) film, which is used to cover the photovoltaic modules. The process of covering the panels with EVA film, i.e. laminating, takes place under specific technological parameters such as temperature and pressure. A consequence of the wrong choice of technological parameters of this process is delamination, which occurs during operation. It most often occurs in hot and humid climate and is observed near current paths. Delamination causes opacity of the EVA film, which can be seen on the Fig. 1.

Figure 1: Delamination of EVA film along the module Photo by Stanisław Bajorski used with permission of Solar Building Polska.

The consequence of delamination is a worsening of the protective properties against moisture penetration into the cells, as well as a worsening of the light transmission to the cell, which results in a worsening of the modules' working efficiency [1], [2], [3].