The design of solar power plants up to 100 [kW] connected to the grid by category entrepreneurcustomer with own production is based on precisely defined guidelines. In this case it will be used, panels with a peak power of 0.395 [Wp]. The project envisages the installation of a total of 138 panels, a peak power of all plant will be 54.5 [kWp]. The inverter that is planned to be installed is a Huawei "SUN2000 50KTL M0" product with a peak power of 50 [kVA]. Concrete profiles will be used for the construction, which are also weights. The entire system will be connected to the Internet, access and management will be possible via mobile phone. The possibility of expanding the system is foreseen at the facility, and the selected cables are oversized with adequate protection within the permitted limits. Along with the attached drawings and cost estimates, purpose is show a detailed analysis of the system. According to the attached graphs, the selectivity of the system itself and the elaboration of protection settings up to 100 [kW] will be proven.