This paper presents a simulation-based analysis of a small residential microgrid composed of one prosumer equipped with photovoltaic generation, wind energy and battery storage, along with two consumers. The study evaluates energy balances, grid interactions, and economic indicators under different operating conditions. A reference case and study case are compared in terms of annual energy exchanges, self-consumption, self-sufficiency, and Net Present Value. A sensitivity analysis is performed on PV size to determine its impact on system performance. The integration of battery storage enables 0.82 MWh of energy to be supplied to loads, with losses limited to 3% annually. From an economic perspective, the resulting levelized cost of electricity for the prosumer is 0.649 €/kWh, and the Net Present Value analysis indicates that renewable investments become economically viable in the long term despite high initial capital expenditures. Results show that increasing PV capacity significantly enhances self-consumption and reduces grid dependency, while battery storage smooths energy flows and improves flexibility. The study highlights the importance of proper sizing of distributed energy resources in residential microgrid development.