The master thesis consists of two parts. The first part of the thesis is based on the theoretical explanation of components for photovoltaic power plants. The components of photovoltaic power plants are the photovoltaic module, photovoltaic panel supports, photovoltaic inverter, photovoltaic cables and protection of photovoltaic power plants and connection of photovoltaic power plants to the power grid. In this part of thesis, photovoltaic power plants and their divisions are explained. The second part of the thesis consists of the practical part the calculation of components for a photovoltaic power plant. The practical part of the thesis was created in the spreadsheet program Excel. The initial parameter in making the calculation was the desired output power of the photovoltaic power plant. Based on the output power of the photovoltaic power plant, the calculation part of choosing the number of components of the photovoltaic power plant was performed. The table with the technical parameters for the photovoltaic module and the technical parameters for the photovoltaic inverter should be supplemented in the spreadsheet program Excel. After calculating the required number of components for the photovoltaic power plant, it is necessary to compare whether the photovoltaic arrays can function together with the photovoltaic inverter. After comparing photovoltaic arrays and photovoltaic inverter, the required number of photovoltaic converters should be selected according to the given output power.