Recently, the construction of residential complexes has spread significantly in all cities of Iraq. Hence, incorporating renewable energy into residential buildings provides multiple advantages as an essential component of the global sustainability initiative. In this study, a techno-economic analysis of a photovoltaic (PV) system has been evaluated in residential buildings of Kass Suwailem I and II, Iraq-Hilla, as a case study. The evaluation involved the technical and economic feasibility of implementing a solar power generation system in this residential setting. Furthermore, it assessed the costs, benefits, and financial viability of installing and operating a PV system for electricity generation. The optimal size of the PV system based on the energy consumption, local solar irradiation levels, and electricity demand patterns for each apartment unit has been evaluated. For each apartment unit, the total PV system cost is assumed to be $12,470 consisting of a 14.7 kW array, 8-battery bank of 230 Ah each, controller, and 10 kW inverter. Life-Cycle Cost analysis has been employed to determine the comprehensive cost of the PV system, encompassing all expenditures accrued throughout its operational lifespan. The calculation of the installed PV system involves annual energy rationalization, along with determining the amount of cost reduction and comparing the system with a generator or any other source that uses fossil fuels.

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