A grid-connected PV system is made up of an array of panels mounted on rack-type supports or integrated into a building. These panels are connected in series or parallel to achieve optimal voltage and current, and feed into an inverter transforming direct current into alternating current at a phase and at the same voltage as the grid. The typical operating voltage of an array of panels is around 150-400 V DC for small systems (1-3 kW) and 400-700 V DC for inverters of 10-500 kW. Maximum voltage is generally limited on the one hand by problems of insulating panels to avoid any current leakage, and on the other hand by the maximum voltage accepted by the inverter. The inverter will be equipped with a maximum power point tracking (MPPT) system that constantly adjusts the entry voltage to the characteristics of the PV modules, which vary according to temperature and solar radiation.