what make model converter/charger
some can be used with NO batteries, some recommend batteries always be connected
SOlar
batteries must be connected to controller, BEFORE panels are connected to the controller
many controllers 'auto sense' battery system voltage
connecting panels first can spike the controller and damage it
NOTHING needs to be disconnected before installing solar
in fact i would do the opposite of what you intend
i would unhook from shore power, while doing the install and leave the batteries connected and powering the RV
nothing will shake up your day, like putting a screw thru a HOT 120v wire routed thru the ceiling, or re-connecting A powered hot charge/converter while doing 12v wires
