Solar and wind power generation is highly volatile due to weather and environmental changes, easily causing unstable power supply and power outages. With century-old mature technology and extremely low procurement and operation costs, lead-acid batteries have become mainstream standby energy storage power sources for wind and solar projects. They feature excellent instantaneous discharge performance, quickly responding to power fluctuations of photovoltaic and wind power to stabilize voltage and harmonics. Maintenance-free valve-regulated lead-acid batteries adapt to complex outdoor environments with strong temperature resistance and impact resistance. Widely used in distributed photovoltaic and small wind power stations, they are cost-effective basic options for renewable energy energy storage.