The ornamental design for a solarpanel, as shown and described.
FIG. 1 is a perspective view of a solar panel showing my new design;
FIG. 2 is a first side view thereof;
FIG. 3 is a second side view thereof;
FIG. 4 is a third side view thereof;
FIG. 5 is a fourth side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of portions of the solar panel in the figures is included for the purpose of illustrating environmental structure and forms no part of the claimed design.
The short dash long dash broken lines define the bounds of the claimed design and form no part thereof.