Onymous Early-Life Performance Degradation Analysis of Recent Photovoltaic Module Technologies

Marios Theristis, Joshua Stein, Chris Deline, Dirk Jordan, Charles Robinson, William Sekulic, Allan Anderberg, Dylan Colvin, Joseph Walters, Hubert Seigneur, Bruce King

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations


The cost of photovoltaic (PV) modules has declined by 85% since 2010. To achieve this reduction, manufacturers altered module designs and bill of materials; changes that could affect module durability and reliability. To determine if these changes have affected module durability, we measured the performance degradation of 834 fielded PV modules representing 13 module types from 7 manufacturers in 3 climates over 5 years. Degradation rates (Rd) are highly nonlinear over time, and seasonal variations are present in some module types. Mean and median degradation rate values of −0.62%/year and −0.58%/year, respectively, are consistent with rates measured for older modules. Of the 23 systems studied, 6 have degradation rates that will exceed the warranty limits in the future, whereas 13 systems demonstrate the potential of achieving lifetimes beyond 30 years, assuming Rd trends have stabilized.

Original languageAmerican English
Pages (from-to)149-160
Number of pages12
JournalProgress in Photovoltaics: Research and Applications
Issue number2
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Progress in Photovoltaics: Research and Applications published by John Wiley & Sons Ltd.

NREL Publication Number

  • NREL/JA-5K00-82352


  • degradation
  • LeTID
  • PERC
  • performance loss rates
  • PV lifetime


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