Different techniques can be used to detect and quantify PV modules anomalies, as visual inspections, electrical tests like the I-V curve test, thermography or electroluminescence (EL). Each of these techniques has some advantages and disadvantages, and based on them, PV plants operators usually apply only one or two of these techniques within the Operation and Maintenance (O&M) activities. Additionally, the results provided by each of them are usually studied separately, by different
research groups. However, these methods can 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.
