**2.1. Relationship Among PV Cell, Module and Array**

Photovoltaic cells are the basic building blocks on construction of PV power systems. The amount of power delivered by a PV cell is, typically, restricted to few Watts, due to the sur‐ face area limitation. For raising the generated power, in order to reach hundreds of Watts, PV cells may be grouped in a PV module. Similarly, it is possible to connect a group of PV modules (series, parallel or both) in order to obtain a PV array, whose power range is estab‐ lished from kilo-Watts to mega-Watts [19]. The distinction among PV cell, module and array is illustrated at Figure 1.

**Figure 1.** PV array composed by an arrangement of PV modules and PV module composed by an arrangement of PV cells.
