This study designed and simulated three low-cost solar microgrid architectures to address the critical challenge of offgrid rural electrification in Uganda. The primary objective was to identify the most techno-economically viable and sustainable configuration for a model community of 100 households. The methodology involved modeling three distinct systems a PV-battery system (Microgrid A), a PV-battery-diesel hybrid (Microgrid B), and a PV-wind-battery hybrid (Microgrid C) using the HOMER Pro software, with analysis based on local solar resource data, detailed load profiling, and sensitivity analyses for key variables like fuel cost and component pricing. The results demonstrated that Microgrid A was the most optimal configuration, achieving a levelized cost of energy (LCOE) of $0.18/kWh, a 100% renewable fraction, and zero carbon emissions, while reliably meeting the community's annual energy demand of 110,000 kWh. Microgrid B, though reliable, proved economically and environmentally inferior with an LCOE of $0.23/kWh and annual emissions of 9.2 tCO₂ due to diesel dependency. Microgrid C, while fully renewable, had a higher LCOE of $0.20/kWh and capital cost, making it less attractive. Sensitivity analysis confirmed the robustness of Microgrid A, showing minimal LCOE fluctuation under cost and demand variations. It was concluded that a solarplus-storage microgrid is the most feasible solution for rural Uganda, balancing cost, sustainability, and reliability. It is therefore recommended that stakeholders proceed with the pilot deployment of Microgrid A, supported by a phased implementation plan, community-based management training, and a sustainable tariff model to ensure long-term operational and financial viability.