The efficiency of solar energy conversion using semiconductor elements is being developed in the following areas: increasing the efficiency of
photovoltaic cells through the search for new materials and methods of their processing; use of solar energy concentrators; development of solar orientation systems; creation of cogeneration plants for more efficient use of solar energy. Currently different type of solar cells are being developed, silicon photoconverters (due to their low cost and well-established manufacturing technology) and multijunction heterostructures (GaInP/GaIn/Ge), which have the highest efficiency, are of interest. The latter type of photocells has the greatest efficiency in concentrated solar radiation with a concentration coefficient of 100...1000. High concentration factors are most easily achieved using a Fresnel lens. To cool photovoltaic elements, it is recommended to use thermal energy and use an active cooling system. In this regard, the task was set to develop an experimental device with a solar energy concentrator based on Fresnel lenses.