All-in-one design, integrated liquid cooling battery pack, battery management system BMS, energy management system EMS, modular PCS and �H�re protection system in one. The system is equipped with transformers and switchgear. The system can be combined with photovoltaic power generation to form a grid-tied solar with energy storage system. Multiple systems can be connected in parallel for �H�exible expansion. The system is suitable for a variety of applications such as, on-grid/o�H�-grid solar energy and storage system, backup power supply, and solar diesel-microgrid system.