The ornamental design for a casing for a solar mobile charger, as shown and described.
FIG. 1 is a front-bottom perspective view of an ornamental design for a casing for a solar mobile charger according to a first embodiment of the present invention;
FIG. 2 is a front-side perspective view thereof;
FIG. 3 is a back perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a first side view thereof;
FIG. 7 is a second side view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a top view thereof;
FIG. 10 is a front-side exploded perspective view of the ornamental design for a casing for a solar mobile charger; and,
FIG. 11 is a side view thereof, with the exploded panel removed for ease of illustration.
The broken lines shown in FIGS. 1-11 are for illustrative purposes only and form no part of the claimed design.