Scenario Characteristics: Villas, self-built houses, and some high-rise residential units equipped with rooftop PV systems, enabling "self-consumption with surplus fed to the grid," reducing household electricity costs while providing emergency backup power.

Core Requirements:
Modular design for on-demand capacity expansion
Fast on/off-grid switching (millisecond-level response)
Low noise and aesthetic design that blends with home environments
Smart APP management for real-time energy usage data