NFPA 855, “Standard for the Installation of Energy Storage Systems”, provides guidelines and requirements for the safe design, installation, operation, and maintenance of energy storage systems.
[pdf] However, with anti-islanding protection, the inverter ensures that when grid power is lost or excess power is produced, the energy is directed towards local loads or stored in energy storage systems, instead of being sent back to the grid.
[pdf] ESS can provide near instantaneous protection from power interruptions and are often used in hospitals, data centers, and homes. What Is an ESS? An ESS is a device or group of devices assembled together, capable of storing energy in order to supply electrical energy at a later time.
[pdf] 
