This research explores the intricate dynamics of rural electrification, presenting a meticulous analysis of a revolutionary PV/Biogas/Lithium Ion Battery Off-Grid System. Utilizing advanced simulation via HOMER software, the optimal system configuration is unveiled, and the system's nuanced sensitivity to variations in photovoltaic (PV) and Lithium-Ion battery costs is examined. The optimal system configuration, derived through rigorous analysis, encompasses a PV capacity of 50 kW, a Biogas capacity of 50 kW, and a Lithium-Ion battery capacity of 12 kWh. These findings serve as crucial benchmarks, providing tangible parameters for the design of sustainable and economically viable energy solutions in remote, off-grid communities. The study delves into economic intricacies, emphasizing the direct relationship between cost multipliers and key metrics such as Total Net Present Cost (TNPC) and Cost of Energy (COE). The research's implications reach far beyond the specific system, resonating profoundly within the broader landscape of rural electrification. Identified sensitivities in cost variations offer actionable considerations for stakeholders, policymakers, and practitioners involved in energy solutions for off-grid communities. Furthermore, the optimal system configuration serves as a tangible blueprint, guiding the implementation of efficient and sustainable energy solutions across diverse off-grid contexts.