High energy density, high degree of product integration, small size, suitable for distributed energy storage applications; It can conveniently meet users' needs such as peak shaving and valley filling, dynamic capacity increase, demand management, guaranteed power supply, backup power supply, etc Configurable well off grid switching module to achieve simultaneous off grid switching within 20ms, ensuring stable power supply for customers; With strong load adaptability, it can drive motors, air conditioners, water pumps, and even impulse loads and half wave loads when working off the grid Multiple charging and discharging times can be set, and the system operates automatically to achieve unmanned operation; It is convenient to connect multiple devices in parallel to form a small and medium-sized energy storage system, with no limit to the number of connected devices.