The commercial & industrial (C&I) energy storage system of Sermatec integrates batteries, battery management system (BMS), energy management system (EMS), modular power conversion system (PCS), and fire protection system into the cabinet. The system’s capacity is up to 215 kWh and the power is up to 100 kW. The modular design facilitates flexible capacity expansion and adapts to various scenarios. The system has many functions such as voltage regulation, three-phase imbalance control, and harmonic control to improve power quality. It also enables load tracking, back-up power supply and peak shaving, which can reduce enterprises’ energy consumption costs, increase their green energy consumption, and keep their systems running safely and stably.