The grid-connected photovoltaic system represents the largest percentage of photovoltaic installations. This type of system consists of photovoltaic panels, an inverter and a grid connection system. The block diagram of an on-grid photovoltaic system connected to the 230 V grid is presented in Fig. 1, while a photovoltaic farm in Fig. 2.

Figure 2: Photovoltaic farm built with Sunport Power MWT 400 Wp modules from Columbus Energy. Photo used with permission from Columbus Energy.

The settlement with the power company takes place on a balance basis at the end of the settlement period, i.e. up to 365 days from the moment the energy is fed into the grid [1]. For installations up to 10 kWh, it is possible to take back \( 80\% \) of the generated energy from the grid, and for installations over 10 kWh \( 70\% \). For this reason, an on-grid installation requires the installation of a bidirectional meter to measure the amount of energy taken from and returned to the grid, respectively.