The ornamental design for a solarpanel, as shown and described.
FIG. 1 is a front, bottom, and left side perspective view of a solar panel;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side elevational view;
FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image of the top plan view; and
FIG. 6 is an enlarged view of the section indicated by the dot-dash callout box 6 in FIG. 3; and,
FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6.
The evenly spaced broken lines shown in the figures are for the purpose of illustrating portions of the solar panel that form no part of the claimed design.