The Photovoltaic Power Profile Emulation (PPPE) software was tested in this thesis. PPPE is software that enables the emulation of photovoltaic panels on programmable DC sources manufactured by Magna-Power Electronics. For a better understanding of the system emulated by the software, a simplified structure of a photovoltaic cell is described and a basic physical description of photovoltaic conversion (photoelectric effect) is given. Basic equations are given that describe the equivalent electrical circuit of a photovoltaic cell. In the PPPE software, there is the option of choosing two technologies for the production of photovoltaic panels. Therefore, in a separate chapter, the technology of manufacturing photovoltaic panels in crystalline silicon and thin film technologies is described with an explanation of the catalog data of commercial panels. The basic technical requirements that a personal computer must meet in order to use PPPE are given and the software installation procedure is briefly described. The program interface is shown and the mode of operation in the software is described in detail. In order to be able to fully use all the possibilities of PPPE, four data entry methods are described, which are used to emulate photovoltaic panels. The software enables emulation of electrical characteristics for different values of temperature and solar radiation of the panel using profiles. Electrical characteristics for a commercial photovoltaic panel Suntech STP190S-24/Ad+ were obtained in Matlab/Simulink, for different values of solar radiation and temperature, using the corresponding block from the Simulink library. Characteristics emulated using PPPE with input parameters of the same Suntech panel were compared with those obtained in Simulink. PPPE was tested in an experiment using a direct current source SL50-30/UI. The experiment used the software’s ability to sequentially change different preset profiles. With the help of the software, either it is possible to sample the values of the emulated electrical quantities. The description of the experimental part shows the time responses of electrical quantities during tests of changes in the input parameters of insolation and temperature, and when the source load changes. Finally, in order to get an impression of where the operating points are located, the corresponding stationary characteristics.