Energy Storage System

FIG. 1 is a right, front, top perspective view of an energy storage system showing our new design; FIG. 2 is a left, rear, bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side elevational view thereof; FIG. 6 is a right side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is an enlarged view of circled portion 9 in FIG. 1 ; FIG. 10 is an enlarged view of circled portion 10 in FIG. 1 ; FIG. 11 is an enlarged view of circled portion 11 in FIG. 1 ; FIG. 12 is an enlarged view of circled portion 12 in FIG. 1 ; FIG. 13 is an enlarged view of circled portion 13 in FIG. 1 ; and, FIG. 14 is an enlarged view of circled portion 14 in FIG. 4 . The dash-dash broken lines in the drawings illustrate portions of the article that form no part of the claimed design. The dash-dot broken lines illustrate the boundaries of the portions shown enlarged in the drawing figures, and form no part of the claimed design.