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Degradation in PV encapsulant strength of attachment: An interlaboratory study towards a climate-specific test

: Miller, D.C.; Annigoni, E.; Ballion, A.; Bokria, J.G.; Bruckman, L.S.; Burns, D.M.; Chen, X.; Feng, J.; French, R.H.; Fowler, S.; Honeker, C.C.; Kempe, M.D.; Khonkar, H.; Köhl, M.; Perret-Aebi, L.-E.; Phillips, N.H.; Scott, K.P.; Sculati-Meillaud, F.; Wohlgemuth, J.H.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016 : 5-10 June 2016, Portland, Or.
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-5090-2724-8 (Electronic)
ISBN: 978-1-5090-2725-5 (Print on Demand)
Photovoltaic Specialists Conference (PVSC) <43, 2016, Portland/Or.>
Fraunhofer ISE ()
Fraunhofer CSE ()

Reduced strength of attachment of the encapsulant resulting from the outdoor environment, including ultraviolet (UV) radiation, may decrease photovoltaic (PV) module lifetime by enabling widespread corrosion of internal components. To date, few studies exist showing how the adhesion of PV components varies with environmental stress. We have conducted an interlaboratory experiment to provide an understanding that will be used to develop climatic specific module tests. Factors examined in the study included the UV light source (lamp type), temperature, and humidity to be proposed for use in accelerated aging tests. A poly (ethylene-co-vinyl acetate) (EVA) formulation often used in veteran PV installations was studied using a compressive shear test - to quantify the strength of attachment at the EVA/glass interface. Replicate laminated glass/polymer/glass coupon specimens were weathered at 12 institutions using a variety of indoor chambers or field aging. Shear strength, s hear strain, and toughness were measured using a mechanical load-frame for the compressive shear test, with subsequent optical imaging and electron microscopy of the separated surfaces.