Different sized power plants with crystalline silicon PV modules were inspected directly on-site. For the inspection purpose, measurement equipment was used in different situations. First at plants with good infrastructure and accessible power sockets for powering whole PV strings, second with only a small battery powered system for powering separate modules. Characterization methods like thermography, electroluminescence and ultraviolet fluorescence were performed for field use with the goal of testing the practicability in a non-laboratory surrounding. The checked PV plants of different sizes were evaluated to accessibility and difficulties faced by the local conditions on-site. In the majority of cases, and despite of adverse conditions, the checks were successfully performed.
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