The 12V150Ah valve-regulated lead-acid batteries is the core energy storage device for small and medium-sized off-grid photovoltaic systems, suitable for off-grid villages and field power supply scenarios. With sufficient capacity and high stability, it efficiently stores solar power generated during the day and solves the intermittency of photovoltaic power generation. It features low self-discharge rate and excellent charging adaptability for fluctuating PV charging. The sealed design requires minimal maintenance and supports long-term outdoor operation. It can stably power lighting, small household appliances and monitoring equipment, serving as a mainstream cost-effective option for civil off-grid PV energy storage.