User side energy storage and grid side energy storage are two different energy storage systems, with the main difference being their location and purpose. They also have certain differences in function and characteristics:

The user side energy storage system is located on the end user's side and can meet their local needs, such as peak shaving and valley filling, backup power supply, self-sufficiency, etc. The user side energy storage system has a small scale, but can provide personalized power reserve and energy management services. Its main feature is the ability to optimize user electricity consumption behavior, improve energy utilization efficiency, reduce electricity costs, and improve the reliability and stability of electricity supply.

The grid side energy storage system is located on the grid side and connected to the power system, providing energy reserves and regulation services for the entire grid. The grid side energy storage system has a large scale, high power and energy capacity, and can achieve balance, stability, and optimization of the power system. Its main purpose is to balance the load and supply of the power system, provide services such as peak shaving, frequency regulation and voltage regulation, and disaster recovery and backup, in order to improve the stability, reliability, and economy of the power grid.

Overall, user side energy storage is mainly used to meet the personalized needs of end users, improve electricity efficiency and quality; The energy storage on the grid side is mainly used for the operation and regulation of the entire power system, improving the flexibility and sustainability of the grid. These two energy storage systems play important roles in energy transformation and smart grid construction, and their coordination can achieve a more efficient, clean, and stable energy supply system.