A solar cell is an electronic device designed to convert solar energy into electricity and represents the technology of the future. Since silicon currently dominates the world market, this paper considers basic measurements on monocrystalline and polycrystalline silicon panels. Using a temperature chamber and artificial sunlight, module efficiency measurements were made in laboratory conditions. The same was done in real conditions for mFNE. Based on the results, conclusions were made about the optimal operating mode of the solar panel.