In this thesies photovoltaic energy production parameters are described in detailed manner. The concept of solar radiation and of solar radiation estimation on an inclined surface is described, as well as solar cell working principle and it’s interconnection into photovoltaic modules. Main part of this thesis is relied on a designing a hybrid photovoltaic system on a Dalmatian island of Drvenik Mali. Necessary steps for realization of a photovoltaic system project are described, starting with the purpose of construction. When choosing equipment, object location itself must be taken into account as well as the building's roof surface. Facility location is proved to be favorable for the installation of photovoltaic modules based on the online PVGIS tool. Selected configuration of the components required for the implementation of the photovoltaic system will not be able to fully cover the maximum requirements for daily electricity consumption. Therefore, a diesel generator is paired with the system as an auxiliary source of electricity, which will be activated depending on the battery charge. Parallel operation control of diesel generator and photovoltaic system was achieved using Siemens LOGO! programmable logic controller. PLC will control the system using a program written via LOGO! Soft Comfort software. The program enables generator to be activated as needed. A signal from Color control GX control unit is fed to the input of the PLC, which, when activated, executes the commands necessary to start the unit. When auxiliary energy source is no longer needed, control unit of the photovoltaic system sends a signal to the regulator, which executes the commands to return to it’s normal state.