I would like to wire my bird so ground power can be used to learn/troubleshoot avionics. I have installed a plug with a 30a breaker on the sub panel so ground power can be easily connected/disconnected. Currently, this wiring is simply attached to the pos and neg terminals of the battery with the 30a breaker in series between the pos bat terminal and the plug on the subpanel. Would it be advisable to disconnect the ship battery from this setup while running on ground power?