The Battery Energy Storage System (BESS) is designed for deployment across residential, commercial, and industrial applications, providing flexible energy storage solutions for diverse user requirements. It supports peak load management by optimising electricity consumption during periods of high demand while also ensuring an uninterrupted power supply through backup power integration. By storing excess solar energy for later use, the system enhances renewable energy utilisation and improves overall energy efficiency. A smart Battery Management System (BMS) continuously monitors temperature, charging cycles, and battery health in real time to ensure reliable performance and operational safety. The modular architecture allows for scalable energy storage capacity, enabling expansion in line with evolving energy requirements. Additionally, compatibility with rooftop solar and hybrid energy systems supports seamless integration within a wide range of renewable energy installations.