23 August 2017 Comparison of higher irradiance and black panel temperature UV backsheet exposures to field performance
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The need for faster PV qualification tests that more accurately match field observations is leading to tests with higher acceleration levels, and validating the new tests through comparison to field data is an important step. We have tested and compared a wide panel of backsheets according to a proposed new backsheet UV exposure qualification standard from the International Electrotechnical Commission (IEC). Weathering Technical Standard IEC 62788-7-2 specifies higher irradiance and higher black panel temperature UV Xenon exposures. We tested PVF, PVDF, PET, PA and FEVEbased backsheets in glass laminates and simple backsheet coupons in UV exposure condition A3 (0.8W/sqmnm@340nm and 90° C BPT) We find mild yellowing with no mechanical loss in the original lower intensity ASTM G155 0.55 W/sqm-nm 70C BPT exposure condition. The new A3 exposures creates mechanical loss in sensitive backsheets, with no effect on known durable backsheets. Results from the new exposure are closer to field mechanical loss data.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas C. Felder, William J. Gambogi, Nancy Phillips, Steven W. MacMaster, Bao-Ling Yu, T. John Trout, "Comparison of higher irradiance and black panel temperature UV backsheet exposures to field performance", Proc. SPIE 10370, Reliability of Photovoltaic Cells, Modules, Components, and Systems X, 1037002 (23 August 2017); doi: 10.1117/12.2275284; https://doi.org/10.1117/12.2275284


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