Installation of (2) 48-volt strings of batteries. Assembling and mounting of (2) battery shelving units. Each string that is installed contains (24) 2-volt individual cells and are connected by copper battery bars and have a copper bus installed on the top right battery cell. From this top right cell, we installed 750 MCM power cabling back to the DC power plant. These battery strings supply backup power for the already installed DC power plant.