ENERGY STORAGE SYSTEM INCLUDING NEWLY INSTALLED BATTERY RACKS AND METHOD FOR CONTROLLING THE SAME

An energy storage system may include one or more first battery racks, one or more second battery racks, one or more DC/DC converters configured to manage the one or more second battery racks respectively, and a battery system controller configured to monitor outputs of the one or more first battery racks and outputs of the one or more DC/DC converters, and to control the outputs of the one or more DC/DC converters. Tye one or more second battery racks and the one or more DC/DC converters are additionally installed in the energy storage system after the first battery racks are installed in the energy storage system to augment the first battery racks.