The ornamental design for a solar panellayout on a vehicle, as shown and described.
FIG. 1 is a top, right, front perspective view of a solar panel layout on a vehicle;
FIG. 2 is a top, right, back perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings depict portions of the solar panel layout on a vehicle and form no part of the claimed design. The broken lines showing a vehicle depict environmental structure that forms no part of the claim.