This paper describes the operation and calibration modes for an experimental monitoring system of a photovoltaic (PV) plant with greater emphasis on the Maximum Power Point Tracker (MPPT). In order to optimize the energy production and therefore the economic convenience, it is very important that MPPT device works properly and that the measurement of PV electrical quantities is not affected by excessive errors. In this regard, the operation and related features of the MPPT3000, multifunction testing device used in the proposed measuring chain, are described in detail. More specifically, in addition to multi-parameter data acquisition system for PV plants, an experimental setup for calibration and operation check of MPPT devices has been developed, during their normal operation directly connected to the PV panels. From the collected data, it is observed a low measurement error (less than 1,5%) and verified the correct functioning of MPPT3000 devices, able to maximize the PV produced power even in case of abrupt variations in the solar irradiation level.
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