Okay, so there's no shore power plug there now, you were just thinking of using that same sort of plug, but for the solar.
You could, but I'd use something else.
One advantage of the SAE plug posted above, is that quite a few battery chargers have that same plug, so it would be easy to hook up a battery charger to that same plug.
One would be the BatteryMINDER (not Tender, though they might have the same plug). Another would be the little 6a Stanley BC6809 I carry for a backup and to charge other folk's batteries.