Partial shading is one of the most challenging aspects that affects performance and efficiency of photovoltaic (PV) systems. Due to environmental obstructions and structural restrictions, this phenomenon is responsible for power mismatch losses as well hotspots production resulting in lower energy produced by the PV arrays hence its less reliability. These two issues must be resolved if solar energy systems are ever to provide cost effective long term solutions. The review paper examines the relevance of scalability in modern PV system, highlighting the layered series/parallel connection of numerous solar arrays as an effective and firm solution to prevent partial shading. Hierarchical connections are unlike traditional layouts, they provide modularity and improved shading-resiliency while being scalable therefore catering for multiple applications from residential setups to utility-scale solar farms. Additionally, the review introduces current research of reconfiguration algorithms and its underlying to dynamic control strategy for energy harvest optimization under non-uniform shading condition. In addition, this paper gives a systematic review of PV array reconfiguration techniques in their scalability and application challenges as well benefits. We also compare existing methods and demonstrate through case studies as well as simulations that hierarchical connections are indeed effective in mitigating power losses due to shading. This review is aimed to help further improvement being made on more efficient and scalable PV systems by addressing the intersection of scalability along with shading resilience. It also highlights some potential research areas, with an emphasis on the integration of new technologies such as AI and IoT for real-time reconfiguration. The results underline the urgent necessity for new solutions to boost PV performance and drive tomorrow’s sustainable energy systems.