Novel Accelerated UV Testing of Field-Aged Modules: Correlating EL and UV Fluorescence Images with Current Drop

Hamsini Gopalakrishna, Archana Sinha, Jaewon Oh, Kshitiz Dolia, Sai Tatapudi, Govinda Samy Tamizh Mani

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Encapsulant discoloration, a commonly occurring and serious field degradation mode, can be replicated by exposing modules to UV light. Increasing the UV light intensity and the testing temperatures reduces the required testing time. Calculating activation energy using Arrhenius equation for the encapsulant discoloration requires short-circuit current data (or yellowness index data) at multiple temperatures over significant time period. A method of simultaneously obtaining four temperatures in four photovoltaic modules in a single walk-in accelerated UV weathering chamber which drastically reduces the required time and resources is presented. Field-aged modules with visible encapsulant browning were selected for the accelerated testing to determine the wear-out failure mechanisms rather than the early life and midlife failure mechanisms conventionally determined using fresh modules. These modules have been subjected to a very long UV exposure of 450 kWh operating at high temperatures. This work demonstrates that a fast, repeatable, and non-contact UV fluorescence setup can be used in the accelerated testing programs and in powerplants as a standardized technique for an early encapsulant browning detection.

Original languageEnglish (US)
Title of host publication2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1603-1608
Number of pages6
ISBN (Electronic)9781538685297
DOIs
StatePublished - Nov 26 2018
Event7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - Waikoloa Village, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

Name2018 IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 - A Joint Conference of 45th IEEE PVSC, 28th PVSEC and 34th EU PVSEC

Other

Other7th IEEE World Conference on Photovoltaic Energy Conversion, WCPEC 2018
Country/TerritoryUnited States
CityWaikoloa Village
Period6/10/186/15/18

Keywords

  • accelerated UV exposure
  • characterization.
  • detection
  • encapsulant browning
  • multiple module temperatures
  • ultraviolet fluorescence imaging

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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