As far as electrical goes, if the battery is in store mode and the shore power cable is unplugged and the generator is not running, you should be essentially dead electrically. Do check where the battery disconnect solenoid is, though; it may well be in the same general area as the electric panel, rather than next to the battery, and the cable up to that point would still be energized. Disconnecting a battery lead (preferably the ground) would readily and reliably take care of that.