The effect of encapsulant discoloration and delamination on the electrical characteristics of photovoltaic module

Abstract Discoloration and delamination (D&D) of encapsulant in a photovoltaic (PV) module affect the electrical characteristics. Therefore, in this study D&D-induced degradations are investigated with a 25-year-old PV module. The average power output of 25-year-old PV modules decreased by 17.9% compared to initial value. However, insulation properties have been stable over 25 years. Electroluminescence image shows that discoloration has an effect on the cell degradation. The effect of D&D on the light reflectance and transmittance is evaluated by performing a trapezoidal integration with the standard global reference spectrum. Failure analysis reveals that delamination occurs at the interface between encapsulant and solar cell and also shows that corrosion of solder occurred near delamination site

[1]  Gary Jorgensen,et al.  Moisture transport, adhesion, and corrosion protection of PV module packaging materials , 2006 .

[2]  Cheryl E. Kennedy,et al.  Acetic acid production and glass transition concerns with ethylene-vinyl acetate used in photovoltaic devices , 2007 .

[3]  S. Reiber,et al.  Galvanic Stimulation of Corrosion on Lead-Tin Solder-Sweated Joints , 1991 .

[4]  Gernot M. Wallner,et al.  Evaluation of the aging behavior of ethylene copolymer films for solar applications under accelerated weathering conditions , 2009 .

[5]  Lewis Fraas Larry Partain.  Solar Cells and Their Applications , 2010 .

[6]  E. E. van Dyk,et al.  Investigation of delamination in an edge-defined film-fed growth photovoltaic module , 2005 .

[7]  F. Chenlo,et al.  Early degradation of silicon PV modules and guaranty conditions , 2011 .

[8]  Anming Hu,et al.  Microscopy study of snail trail phenomenon on photovoltaic modules , 2012 .

[9]  Krissanapong Kirtikara,et al.  Physical deterioration of encapsulation and electrical insulation properties of PV modules after long-term operation in Thailand , 2010 .

[10]  D. Berman,et al.  EVA laminate browning after 5 years in a grid-connected, mirror-assisted, photovoltaic system in the Negev desert: effect on module efficiency , 1995 .

[11]  M. Kempe.  Modeling of rates of moisture ingress into photovoltaic modules , 2006 .

[12]  Giorgio Graditi,et al.  Optical degradation of long-term, field-aged c-Si photovoltaic modules , 2005 .

[13]  Wolfgang Tress,et al.  Photovoltaic Energy Conversion , 2014 .

[14]  Hui Zhang,et al.  Mechanism study of the electrical performance change of silicon concentrator solar cells immersed in de-ionized water , 2012 .

[15]  A. Carr,et al.  A comparison of the performance of different PV module types in temperate climates , 2004 .

[16]  E. E. van Dyk,et al.  Evaluation of performance parameters of PV modules deployed outdoors , 2005 .

[17]  Neelkanth G. Dhere,et al.  Adhesional shear strength and surface analysis of a PV module deployed in harsh coastal climate , 2001 .

[18]  F. Pern,et al.  Encapsulation of PV modules using ethylene vinyl acetate copolymer as a pottant: A critical review , 1996 .