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The aim of this article is to describe how closely PV grid-connected inverters operate at the actual maximum power point. To carry this study out six 50 Hz single-phase inverters were selected from European market, around of 5 kW. Each one of them was put into an outdoor grid-connected system installed in LeganeÂ¿s (Madrid), Spain. Different electrical signals with respect to irradiance, PV module temperature and local time were measured. DC voltage and maximum power point tracking were analysed.