An energy storage system (ESS) is a technology that stores electrical energy that is typically generated from renewable sources like solar or wind, for later use. The battery energy storage system (BESS) is the most common type of ESS, comprised of battery packs and a battery management system (BMS). BMS is a critical component of an energy storage system and is responsible for monitoring and controlling the battery cells' performance to ensure optimal operation and to prevent damage. The power conversion system (PCS) is the heart of the energy storage system, responsible for converting the DC power stored in the battery to AC power that can be used in homes, industrial and commercial sites, or the utility grid. An energy management system (EMS) is responsible for managing and controlling the entire energy storage system, including the battery, power control system (PCS), and other components, to ensure efficient and safe operation. In addition to these key components, an energy storage system also requires environmental control systems (ECS) to maintain a stable operating environment connecting with HVAC, temperature, and humidity sensors.