Photovoltaic Degradation Rates—an Analytical Review

TLDR

Accurate prediction of photovoltaic power output decline over time is essential for ROI calculations as grid penetration rises, requiring known degradation rates to forecast delivery. This article reviews degradation rates of flat‑plate terrestrial modules and systems reported in published literature from field testing throughout the last 40 years. The review is structured into a historical overview, an analytical summary of degradation rates, and a technology‑partitioned bibliography. Nearly 2000 degradation rates, measured on individual modules or entire systems, have been assembled from the literature, showing a median value of 0·5%/year. © 2011 John Wiley & Sons, Ltd.

Abstract

ABSTRACT As photovoltaic penetration of the power grid increases, accurate predictions of return on investment require accurate prediction of decreased power output over time. Degradation rates must be known in order to predict power delivery. This article reviews degradation rates of flat‐plate terrestrial modules and systems reported in published literature from field testing throughout the last 40 years. Nearly 2000 degradation rates, measured on individual modules or entire systems, have been assembled from the literature, showing a median value of 0·5%/year. The review consists of three parts: a brief historical outline, an analytical summary of degradation rates, and a detailed bibliography partitioned by technology. Copyright © 2011 John Wiley & Sons, Ltd.