Photovoltaic Fleet Degradation Insights

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations


In the PV Fleet Performance Data Initiative, high-frequency data from commercial and utility-scale photovoltaic (PV) systems have been collected to examine performance loss rates (PLRs) at a fleet scale. To date, performance data from more than 7.2-gigawatt (GW) capacity, 1700 sites and 19,000 inverters—approximately equivalent to 6% to 7% of the entire US PV market—have been collected. An overall PLR of −0.75%/year was found, which is in line with historical and recent findings. Tracked silicon (Si) and cadmium telluride (CdTe) performed comparably with all fixed-tilt systems. Higher PLRs were found for hotter temperature zones; cooler climates exhibit a median −0.48%/year loss, which increases to −0.88%/year in hotter climates. High-efficiency module technologies showed median PLRs in line with conventional Si technologies but demonstrated markedly different PLR behavior when filtered only for low-light conditions <600 W/m2. Causes for this technology-dependent behavior are under investigation.

Original languageAmerican English
Pages (from-to)1166-1175
Number of pages10
JournalProgress in Photovoltaics: Research and Applications
Issue number30
StatePublished - 2022

Bibliographical note

Publisher Copyright:
Published 2022. This article is a U.S. Government work and is in the public domain in the USA. Progress in Photovoltaics: Research and Applications published by John Wiley & Sons Ltd.

NREL Publication Number

  • NREL/JA-5K00-81314


  • degradation rates
  • durability
  • outdoor testing
  • performance
  • photovoltaic modules
  • photovoltaic systems
  • reliability


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