The electrochemical Residential Energy Storage System is mainly composed of battery packs, battery management systems (BMS), energy management system EPMS), and energy storage inverters (PCS).

In terms of cost. The cost of battery packs has the largest proportion, up to 70 % of the entire electrochemical Residential Energy Storage System, followed by energy storage inverters and battery management systems, each of which can account for about 10 %.

In terms of function. The battery pack is usually composed of multiple battery modules. Each battery module is composed of multiple batteries through series or parallel. It is the core of electrochemical Residential Energy Storage System. Storage and release.

The battery management system (BMS) is mainly monitored by various data in the process of battery packs, such as temperature, current, voltage, and charging status (SOC). System's safe and smooth operation.

Energy management system (EMS) is mainly composed of two parts: basic functions and application functions.

Basic functions refer to computers, operating systems, and EMS support systems; application functions include data collection, data analysis, network monitoring and energy scheduling.

The energy storage inverter (PCS) is composed of DC/AC two -way variables, control units, etc., which can control the battery charging and discharge, and is responsible for the conversion of AC power and direct current.