Evaluation based on performance and failure of PV system in 10 years field-aged 1 MW PV power plant

Wonwook Oh, Hoonjoo Choi, Kun Won Seo, Daesung Kim, So Yeon Kim, Hae Seok Lee, Heon Hwang, Donghwan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


PV (Photovoltaic) power systems have been rapidly installed and spreading worldwide in recent years. And there is a belief that the PV power plant will operate stably for more than 25 years. However, the PV modules have an unexpected failure. In this paper, we diagnosed a 10-year-old power plant using drone with infra-red (IR) camera, current-voltage (I-V) and electroluminescence (EL) measurement. The approximately 1 MW plant, consisting of two different PV modules, 200 W and 220 W, showed various failure modes. 59% PV modules failure caused an output loss, and an inverter with a serious loss is expected to degrade more than its annual degradation rate in PV strings above 40%. As a result, the power loss was quantitatively estimated to hot spot, bypass diode failure and degradation rate, and the capacity of the current PV system was evaluated at 88.3% and 93.2%.

Original languageEnglish
Article number113763
JournalMicroelectronics Reliability
Publication statusPublished - 2020 Nov

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Safety, Risk, Reliability and Quality
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering


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