Climate Specific Thermomechanical Fatigue of Flat Plate Photovoltaic Module Solder Joints

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69 Scopus Citations

Abstract

FEM simulations of PbSn solder fatigue damage are used to evaluate seven cities that represent a variety of climatic zones. It is shown that the rate of solder fatigue damage is not ranked with the cities' climate designations. For an accurate ranking, the mean maximum daily temperature, daily temperature change and a characteristic of clouding events are all required. A physics-based empirical equation is presented that accurately calculates solder fatigue damage according to these three factors. An FEM comparison of solder damage accumulated through service and thermal cycling demonstrates the number of cycles required for an equivalent exposure. For an equivalent 25-year exposure, the number of thermal cycles (- 40 °C to 85 °C) required ranged from roughly 100 to 630 for the cities examined. It is demonstrated that increasing the maximum cycle temperature may significantly reduce the number of thermal cycles required for an equivalent exposure.

Original languageAmerican English
Pages (from-to)124-129
Number of pages6
JournalMicroelectronics Reliability
Volume62
DOIs
StatePublished - 1 Jul 2016

Bibliographical note

Publisher Copyright:
© Published by Elsevier Ltd.

NREL Publication Number

  • NREL/JA-5J00-65152

Keywords

  • Acceleration factor
  • Photovoltaic reliability
  • Solder fatigue
  • Thermal cycling

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