Eva Discoloration Solar Panels

To investigate the eva encapsulant photobleaching and discoloration solar cell laminates having different eva films uv transparent t uv cut c and combination of the two tc were tested.

Eva discoloration solar panels.

Browning in pv modules can induce a power loss by up to 0 5 year. We ll get to that part. Essentially an acetic acid formation is the problem but not too blame. In the solar industry the most common encapsulation is with cross linkable ethylene vinyl acetate eva.

Bad effects of eva browning. Very much what appears to be a visual failure discolouration or browning occurs when there is a yellow or brown discolouration of the ethyl vinyl acetate eva a result of two main causes. Ethylene vinyl acetate eva encapsulants for photovoltaic modules. Solar eva had one job but failed miserably.

The iit bombay group used an ultraviolet accelerated aging test during 34 days on three encapsulant samples. For glass glass module constructions this eva discoloration is more spatially uniform. A new non destructive method has been proposed by researchers in india who say identifying early stage discoloration in eva encapsulants can help detect degradation in solar panels before power. Pern center for performance engineering and reliability national renewable energy laboratory nrel 1617 cole blvd golden colorado 80401 usa.

With the help of a lamination machine the cells are laminated between films of eva in a vacuum which is under. There are plenty of studies online that have fully confirmed that the acetic acid formation is the specific root cause for the discoloration of the eva encapsulate. Solar panel discolouration is an uncontrolled chemical reaction amongst materials. Discoloration itself may not be directly related to power performance of pv modules.

Let s try to make it as simple as possible. Eva films are a key material used for traditional solar panel lamination. Degradation and discoloration mechanisms and formulation modifications for improved photostability f. The thermal ageing of an ethylene vinyl acetate eva polymer used as an adhesive and encapsulant in a photovoltaic module has been investigated.

What are ethylene vinyl acetate eva films. A new non destructive technique has been proposed by researchers who say identifying early stage discoloration in eva encapsulants can help detect degradation in solar panels before power output is affected. Discoloration is rarely observed in the eva between neighboring solar cells.