As a classic backup energy storage device for photovoltaic power systems,  lead-acid batteries effectively solve unstable power supply caused by intermittent sunlight. With mature manufacturing technology and high stability, they store excess solar power generated during the day and supply electricity continuously at night, on cloudy days or during power outages. Mainstream valve-regulated sealed lead-acid batteries are maintenance-free with no acid mist leakage and easy installation. They are widely applied in household and small-scale photovoltaic stations. Featuring outstanding cost performance and strong compatibility, lead-acid batteries remain one of the most mainstream and reliable backup power solutions for small and medium-sized photovoltaic systems.