<p>This study explores the transformative potential of digital twin technology within the solar photovoltaic (PV) ecosystem, emphasizing its applications, performance metrics, challenges, and future directions. By synthesizing insights from cutting-edge research, the paper provides a holistic framework that integrates digital twin features—such as architecture, modeling, software, and IoT-based integration—with the core functionalities of solar PV systems. These features enable real-time simulation, predictive analytics, and system interoperability, thereby optimizing energy generation, streamlining maintenance processes, and extending lifecycle management. The review highlights critical performance metrics, including output efficiency, cost-effectiveness, fault detection, and sustainability, offering a data-driven perspective on enhancing system reliability and reducing environmental impact. The paper also addresses significant challenges confronting the adoption of digital twins in the solar PV sector. Technological hurdles, such as data synchronization and system scalability, are explored alongside financial barriers that impede widespread deployment. Regulatory complexities, including compliance with energy standards and cybersecurity protocols, are analyzed to offer actionable recommendations for policymakers. By identifying gaps in current research—such as the lack of scalable, real-time frameworks and cost-effective deployment strategies—the study lays the groundwork for future advancements. Furthermore, the review outlines promising trends and opportunities, including the integration of artificial intelligence, blockchain, and circular economy principles in PV system management. Emerging applications in predictive fault diagnosis and enhanced grid interaction underscore the potential of digital twins to revolutionize renewable energy. The paper concludes by presenting a roadmap for researchers, practitioners, and policymakers to collaboratively advance the digital twin-powered solar PV ecosystem. By bridging interdisciplinary domains, this study aims to accelerate the transition toward sustainable, resilient, and highly efficient solar energy systems, aligning with global energy and climate goals. This comprehensive review not only elucidates the current landscape but also serves as a catalyst for innovation, equipping stakeholders with a strategic vision to harness the full potential of digital twins in driving the next generation of solar PV technologies.</p>