There are 5 layers inside the panel: the front side is AR coating solar glass; the back side is TPT backsheet, the EVA as adhesive to attach the glass and backsheet together, cells inside without any Humidity and air for power safely generation. The frame is anodized with silver or black color to improve the mechanical strength of solar module. 

Most solar panels are still made up of a series of silicon crystalline cells sandwiched between a front glass plate and a rear polymer plastic back-sheet supported within an aluminium frame.

Once installed, solar panels are subjected to severe conditions over the course of their 25+ year life. Extreme variations in temperature, humidity, wind and UV radiation can put enormous stress on a solar panel. Fortunately, most panels are well-engineered to withstand extreme weather.