Power Inverter

FIG. 1 is a top, right, front isometric view of an ornamental design for a power inverter; FIG. 2 is a bottom, left, rear isometric view of the power inverter of FIG. 1 ; 3 is a front elevational view of the power inverter of FIG. 1 ; FIG. 4 is a rear elevational view of the power inverter of FIG. 1 ; FIG. 5 is a right side elevational view of the power inverter of FIG. 1 ; FIG. 6 is a left side elevational view of the power inverter of FIG. 1 ; FIG. 7 is a top plan view of the power inverter of FIG. 1 ; and, FIG. 8 is a bottom plan view of the power inverter of FIG. 1 . The dash-dash-dash broken lines are included for the purpose of illustrating portions of the power inverter that form no part of the claimed design. The dash-dot-dash broken lines depict boundary lines and form no part of the claimed design.