Failure Diagnosis on Photovoltaic Modules Using Thermography, Electroluminescence, Rgb and I-V Techniques

  1. Morales-Aragonés, José Ignacio
  2. González-Rebollo, M.A.
  3. Martinez-Sacristan, Oscar
  4. Hernández-Callejo, Luis
  5. Gómez-Alonso, Víctor
  6. Jiménez-Martín, Marta María
  7. Moretón, Angel
  8. Gallardo-Saavedra, Sara
36th European Photovoltaic Solar Energy Conference and Exhibition

Publisher: WIP

ISBN: 3-936338-60-4

Year of publication: 2019

Pages: 1171-1175

Type: Conference paper

DOI: 10.4229/EUPVSEC20192019-4AV.2.20 GOOGLE SCHOLAR lock_openOpen access editor


Different techniques can be used to detect and quantify PV modules anomalies, as visual inspections, electrical tests like the I-V curve test, infrared thermography (IRT) or electroluminescence (EL). PV plants operators usually apply only one or two of them within the Operation and Maintenance (O&M) activities. Additionally, researchers usually studied them separately. However, these methods provide complementary results, glimpsing interesting information about the PV site state. The main strength of the research performed is the simultaneous study of all these inspection techniques, studying the correlation between them. Results confirm that, EL and IRT under current injection on modules are closely correlated, while IRT under normal operation (sun exposure) reveals complementary information not detected in EL but existing in the visible spectrum. In conclusion, it is advisable using as many techniques as possible to characterize the actual state of the module and to explain its I-V curve.