Lake-6 is an AC-coupled energy storage system designed to work with household PV systems, providing a flexible and reliable energy management solution for home applications. Based on an intelligent energy management system, users can select from AI Mode, Self-Generation and Self-Consumption Mode, Time-Based Control Mode, and Backup Power Mode according to their actual energy needs. The system supports grid charging, solar surplus storage, peak shaving, and export control, helping optimize household energy use during grid-connected operation while providing backup power for critical home loads during power outages to improve power reliability and reduce electricity costs.