The research team in Tunisia has studied how capital constraints affect optimization of grid-connected PV systems through a detailed case study conducted in Sousse. According to the research team in Tunisia, HOMER and MATLAB simulations were applied to evaluate system sizing, surplus energy management, and overall economic performance outcomes. Findings from the research team in Tunisia showed that an optimized configuration of 2.25 kW solar array, 1.5 kW inverter, and 1 kWh battery required investments exceeding TND 8 million (~$2.72 million). The research team in Tunisia confirmed that this optimized setup has reduced electricity costs to TND 0.130 per kWh (~$0.044/kWh). It was also shown by the research team that annual carbon dioxide emissions decreased significantly from 2,597 kilograms to 1,490 kilograms under the optimized configuration. The research team has indicated the need to incorporate financial constraints into design planning to improve feasibility when there is limited funding. The team has stressed the findings support guidance for policymakers and investors as they consider affordability, efficiency, and emissions reduction.