This paper presents a comprehensive analysis of implementing solar photovoltaic (PV) systems for billboard lighting, with a focus on technical design, economic feasibility, and sustainability. Traditional billboard lighting methods largely depend on conventional power sources, which not only contribute to environmental pollution but also incur significant energy costs. To address these challenges, we propose a solar PV system specifically designed for dual-sided billboards typically found in urban and rural settings across Colombia. The study covers detailed system design, including the selection and optimization of PV panels, inverters, batteries, and LED lighting fixtures, ensuring efficient energy use and compliance with local illumination standards. A technical-economic analysis is performed to evaluate the project's viability, highlighting potential cost savings and environmental benefits. The results indicate that, despite higher initial investments, solar-powered billboards can significantly reduce operational costs and carbon footprints compared to traditional systems, offering a promising alternative for sustainable outdoor advertising. The study contributes to the broader discourse on renewable energy adoption in commercial applications, providing valuable insights for stakeholders considering green solutions in the advertising sector.