Photovoltaic installations are used to obtain solar energy and convert it into electricity. This is done by means of silicon wafers, from which a photovoltaic panel is built. A set of photovoltaic installation also consists of an inverter changing direct current to alternating current, a meter for consumption and production of electricity, electric cables and an energy storage battery. We distinguish on-grid installations connected to the power grid, to which we give the surplus energy with the possibility of their later use and off-grid focusing on storing energy in batteries installed in the installation.