A 20 kW Energy Storage System (ESS) is an integrated electrical power system designed to store energy and deliver it in a controlled manner to support power demand. The system generally comprises an energy storage unit (such as lithium-ferro-phosphate batteries), a power conversion system (PCS), a battery management system (BMS), protection devices, and a monitoring and control interface.

The primary function of a 20 kW ESS is to improve the reliability, efficiency, and flexibility of electrical power systems. It enables the storage of excess energy generated during periods of low demand or high renewable generation and supplies this energy during peak demand, grid disturbances, or outages. Such systems are widely applied in small-scale commercial facilities, residential clusters, and distributed energy systems, particularly in conjunction with renewable energy sources.

It supports essential grid services, including peak load management, voltage and frequency regulation, and backup power provision. By reducing peak demand and smoothing power fluctuations, the ESS contributes to improved power quality and reduced operational stress on the electrical grid. With the continued development of advanced battery technologies and intelligent energy management systems, 20 kW ESS installations play an increasingly important role in enhancing energy sustainability, resilience, and overall system performance.