An Energy Storage Inverter (ESI) is an important electrical device that enables the conversion of electricity between a battery storage system and the grid or a connected load. Essentially, it is a specialized power inverter that is specifically designed to function seamlessly with a battery storage system, solar PV system, or other types of renewable energy sources. The main purpose of an ESI is to manage the flow of electricity between these different sources to ensure that energy is stored, distributed and utilized in the most efficient and cost-effective manner.