The GoodWe BT series is an AC coupled retrofit inverter that is capable of upgrading existing three-phase on-grid photovoltaic systems to energy storage systems. The AC-coupled solution can transform any three-phase PV system on the grid into an energy storage system with batteries, increasing grid independence and self-consumption. It is compatible with high-voltage lithium-ion batteries from 180 to 600 V and features a UPS level switching for stable and reliable power. The BT series can intelligently transfer the UPS level to standby mode in less than 10ms, ensuring that critical loads are uninterrupted. Supporting various communication protocols, the BT series enables the integration of smart home systems according to the individual needs of users. Easy, smart and intuitive.