###### Abstract
However, scientific works [17; 18; 19; 20] do not indicate how to adjust the angle of inclination of the module panels depending on the season. Such studies are presented in scientific works [21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35]. In particular, the author of a scientific work [21] provided technical recommendations for the values of the optimal angles of inclination of PV-module panels for each month of the year, for each season for different regions of the city of Medina, which is in Saudi Arabia. Adjusting the angle of inclination of the PV-module panels depending on the season increased the installation efficiency of electricity production by 8%. The expediency of adjusting the optimal inclination angle of the PV-module solar panels depending on the season was also confirmed by research conducted in the winter period on the territory of Athens, Greece [22]. In turn, the authors of a scientific work [23], based on their own research, recommended reducing the angle of inclination of the PV-module solar panels to the horizon in the summer season in order to meet the need for electricity of the consumers in different latitude zones of India. According to the results presented in a scientific work [23], when the optimal angle of inclination of PV-module solar panels was reduced by 10\({}^{\circ}\), the level of monthly electricity generation by PV-module panels increased by 8.5%, although at the same time there was a slight decrease in the indicator of the annual level of electricity generation. A scientific work [24] analyzed the dependence of the power generated by the PV-module in the western region of Saudi Arabia on the values of the angle of inclination of the solar panels to the horizon and their orientation in space. The studies were carried out for different time periods: a month, two months, a quarter of a year, half a year, and a year. The highest average monthly power output for a 1 kW PV-module panel was 0.225 kW at a panel angle of 0\({}^{\circ}\) to the horizon, and it was obtained in June. The authors recommend adjusting the angle of inclination of the PV-module panel to the horizon in a time frame shorter than a month, in order to maximize the power produced by PV-module panels and increase the installation efficiency of the PV-module. Similar studies have been described in another scientific work [25]. The authors, by using isotropic and anisotropic models of diffuse solar radiation, determined the optimal tilt angles of the PV-module panels for 44 cities of Ethiopia during different time intervals from a season to a year. The results of numerous studies show that the optimal value of the angle of inclination of the PV-module panel to the horizon should be smaller than the geographical latitude of the PV-module's installation location. It is noted that the use of the annual average fixed value of the optimal angle of inclination of the PV-module panel compared to the monthly optimal angle of inclination value allows one to save from 5.11% to 6.275% (isotopic model) and from 5.72% to 6.346% (anisotropic model) of solar radiation energy. A scientific work [26] studied and compared the values of PV-module performance at different azimuths and tilt angles of PV-module solar panels to the horizon. The results of the experiments emphasize that the tilt angle of the panel and the values of the azimuth angles have a significant impact on the power generation process, the filling factor and the current strength. Thus, for the province of Konya in Turley, the maximum energy generation took place when the tilt angle of the PV-module solar panel was 32.08\({}^{\circ}\), and the azimuth angle was 0\({}^{\circ}\). The authors of a scientific work [27] tried to solve the problem of increasing the share of energy generated from the solar source in the energy balance of Bangladesh, in the absence of space for the installation of large-scale power plants.