This AC-coupled integrated 8KWh energy storage system integrates battery and inverter modules without additional wiring, suitable for upgrading old photovoltaic systems. Equipped with a self-developed 8KW power inverter with 97% high conversion efficiency, it adapts to small industrial and commercial energy storage scenarios. Using first-grade dedicated energy storage cells, it has a 15-year design life and over 15000 full charge-discharge cycles at 25°C. With IP65 outdoor protection level, it is fully dustproof and waterproof, featuring excellent temperature resistance and aging resistance for outdoor installation.