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The importance of a photovoltaic cell/module operating temperature for its electrical performance is well known, as well as the necessity for in situ fast and reliable monitoring techniques for PV park efficiency. Nowadays, these techniques are based namely on conventional 'data acquiring' measuring principles. The latter are time consuming and unreliable in case of not suitable and uncertified measuring equipment. The challenge for an in situ reliable, fast and adequately accurate technique for the estimation of a PV module performance is more than obvious. The current paper investigates the pertinent correlation among the operating temperature of a PV module in situ (Tc) measured by an infrared (IR) camera and its relative electrical performance. The advantages and disadvantages of the (IR) technique are discussed in an effort to facilitate the monitoring/maintenance process in solar energy applications. In conclusion, infrared thermography appears to be a potential non-destructive method for the in situ evaluation of a PV module performance. The method gives fast, quite reliable and of easy interpretation results regarding to the condition of each solar cell in a PV module. Unfortunately, specific limitations referring to emissivity problems, the presence of glass in front of the solar cells and the undesirable dependency from the environmental (ambient and background) conditions have to be taken into account. In situ thermographic inspections to glass-coated commercial PV modules, as well as the use of active thermography for indoor or night measurements and the inspection of PV plants utilizing aerial thermography, are of further interest and investigation of the current research team which aspires to develop a complete PV module condition monitoring technique, with certain image processing and fault classification tools.