The increasing integration of renewable energy sources, particularly photovoltaic (PV) systems, has led to greater electricity price volatility and grid stability challenges. To address this, energy storage solutions have become crucial for balancing supply and demand. This paper examines the feasibility and advantages of DC-coupled battery energy storage systems (BESS) for PV parks, comparing them to traditional AC-coupled alternatives. A detailed market review of existing BESS products and DC/DC converters is conducted, highlighting the efficiency and cost considerations of different topologies. The study explores various configurations of DC-coupled storage, including small-scale residential, medium-scale commercial, and large-scale utility applications. Key challenges, such as battery selection, power conversion efficiency, and grid integration, are discussed, with a focus on optimizing economic returns through energy arbitrage. The findings suggest that DC-coupled energy storage offers improved efficiency and cost-effectiveness for PV applications, making it a viable solution for future renewable energy expansion.