The aim of this final thesis is describe construction and installation of the same, rotary photovoltaic system. The comparison of the fixsed and rotary system for Karlovac. The introduction briefly describes the content of the final thesis, and can be clearly seen that, due to the increasing awareness, more and more countries turns the production of electricity trough renewable sources. The second section provides general information about the Sun and Sun structure. The third chapter describes the Sun solar radiation in the atmosphere boundary, world wide and in Croatia, and the spectrum of Sun solar radiation. The fourth section describes the conversion of sunlight into electrical energy, photovoltaic or solar cells. Production technologies for solar cells are described in chapter five. The sixth chapter describes photovoltaic systems. In the seventh section shows the performance of photovoltaic systems. Chapter eight presents construction of the uniaxial roof rack photovoltaic panels. The final ninth chapter contains the conclusion of this final thesis.