Perspective: Performance Loss Rate in Photovoltaic Systems

Michael Deceglie, Kevin Anderson, Daniel Fregosi, William Hobbs, Mark Mikofski, Bennet Meyers, Marios Theristis

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations


Photovoltaic systems may underperform expectations for several reasons, including inaccurate initial estimates, suboptimal operations and maintenance, or component degradation. Accurate assessment of these loss factors aids in addressing root causes of underperformance and in realizing accurate expectations and models. The performance loss rate (PLR) is a commonly cited high-level metric for the change in system output over time, but there is no precise, standard definition. Herein, an annualized definition of PLR that is inclusive of all loss factors and that can capture nonlinear changes to performance over time is proposed. The importance of distinguishing between recoverable and nonrecoverable losses which underly PLR is highlighted.

Original languageAmerican English
Article number2300196
Number of pages6
JournalSolar RRL
Issue number15
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Alliance for Sustainable Energy and The Authors. Solar RRL published by Wiley-VCH GmbH.

NREL Publication Number

  • NREL/JA-5K00-85463


  • degradation
  • performance loss rates
  • photovoltaic systems
  • underperformances


Dive into the research topics of 'Perspective: Performance Loss Rate in Photovoltaic Systems'. Together they form a unique fingerprint.

Cite this