Infrared thermography could be an important diagnostic tool for assessing the performance of photovoltaic panels. Malfunctions, material and insulation defects can be detected easily and fast without complicated proceedings. It can be applied to large and small scale systems so as to secure the best possible function and thus performance of the panel(s). In this work, a thermographic survey was performed on a photovoltaic plant of 1 MW in Greece. Various deficiencies were detected by using in situ thermography. Although these panels were only a few months into use, there were defected areas spotted by thermography, indicating the poor performance of these panels and thus affecting the total power output of the photovoltaic plant
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