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Insights on the Degradation and Performance of 3000 Photovoltaic Installations of Various Technologies Across the United Kingdom

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JournalIndustrial Informatics, IEEE Transactions on
DateAccepted/In press - 4 Sep 2020
DateE-pub ahead of print - 8 Sep 2020
DatePublished (current) - 16 Jun 2021
Issue number9
Pages (from-to)5919-5926
Early online date8/09/20
Original languageEnglish


This article presents the degradation rates over 8 years for 3000 photovoltaic (PV) installations distributed across the U.K. The article considers three PV cell technologies, namely, monocrystalline silicon (Mono-Si), polycrystalline silicon (Poly-Si), and thin-film cadmium telluride (CdTe). The available raw data undergoes three key stages: normalization, filtering, and aggregation, before the degradation analysis of the considered installations. This algorithm can be considered as one of the article contributions. Results show that a maximum degradation rate of −1.43%/year is observed for the CdTe type, whereas Poly-Si and Mono-Si PVs have annual degradation rates of −0.94% and −0.81%, respectively. Moreover, this article exploits the monthly mean performance ratio (PR) for all the examined PV sites. The highest PR value of 87.97% is calculated for the Mono-Si PV installations, while 85.08% and 83.55% are calculated for Poly-Si and CdTe installations, respectively.

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