The development of renewable energy sources (RES) and energy storage technologies is a key element of the transformation of modern power systems. The growing importance of solar energy, as one of the cleanest and most accessible energy sources, requires the optimization of its use in local power systems. This study analyzes the parameters of local power system (LES) devices with solar power plants and energy storage devices and determines their operating modes during different periods of power outages. As part of the research, an analysis of the reliability of electricity supply to LES recipients were carried out using the REopt platform for 4 different dates – December 22, June 22, March 22 and September 22. In the second step, the solar energy system modes were analyzed using the System Advisor Model (SAM) software. The analysis showed that the orientation of the module subassemblies with deviations of ±45° from the south direction allows for higher power output in the morning and evening hours. It was also shown that the arrangement of the modules in two subassemblies allows for reducing the power cut-off by the inverters at noon, so with one module arrangement, the cut-off value is 1.743%, and with two subassemblies – 0.339%.