Adopting a modular design, the 51.2V LiFePO4 solar storage battery supports intelligent parallel connection for capacity expansion to meet diverse household power demands. Basic models with 5KWH to 10KWH capacity cover daily household power needs, and expanded versions support high-power appliances and home charging piles. It fits small apartment daily power use, large house full-house energy storage and off-grid power supply scenarios. Easy to install with wall-mounted and stacked options, it realizes capacity upgrade without complex renovation, providing a flexible and low-cost solution for household energy upgrading.