Insufficient light on rainy days greatly reduces photovoltaic power generation, and thunderstorms easily cause temporary power outages. The 51.2V 314Ah energy storage battery can perfectly solve this problem. The fully stored electric energy can automatically switch to power supply after rainy-day power outages without manual operation. With low self-discharge and stable power retention in idle state, it works well after long-term standing on rainy days. It supports continuous operation of essential appliances such as lights, refrigerators, routers and monitors, avoiding food deterioration and network interruption, providing reliable and long-lasting emergency power guarantee for sudden power outages.