Photovoltaic (PV) power supply systems are the most commonly used power supply method for marine buoys. Due to the limitations of the buoy structure and considering the rotation of the buoy in the ocean, most of the PV modules are placed in a four-sided enclosure. The solar power generation is roughly estimated. Therefore, how to provide a long-term power supply for the buoy system is critical to be addressed. Five standard self-contained models are available: PS 314, PS 20, PS 55 and PS 95 manufactured by. The PowerBuoy® line represents the cutting edge of ocean-based energy and intelligence, delivering reliable, renewable, and robust solutions to meet the demands of modern maritime operations.