Eva Discoloration Solar Panels

Identifying early stage discoloration in the ethylene vinyl acetate eva copolymer encapsulants used for crystalline solar module lamination can spot panel degradation before power output is.

Eva discoloration solar panels. There are two main. Solar panel discolouration yellowing and browning occurs when exposed to sunlight in the first few years. Discoloration itself may not be directly related to power performance of pv modules. Acetic acid and other volatile organic components are also produced from the.

Eva browning is defined as a change in color of the eva film. Solar panel discoloration solar panel blemishes. As a result the eva starts turning to a yellow or brown colour. However discolored eva encapsulant is reported to cause a loss of light transmission to the solar cells leading to loss in power production by up to 0 5 a year by average or up to 1 a year in subtropical climates and this loss can be as high as 10 a year in case of mirror concentrated pv systems in desert conditions.

The eva discoloration is caused by the formation of polyconjugated c c sub n sub double bonds of various lengths. First let s talk about what solar panel discoloration is and why it occurs. Browning in the modules happen when certain additives used to prevent browning and enhance uv tolerance start to disappear after losing strength against uv rays. Essentially an acetic acid formation is the problem but not too blame.

We ll get to that.