Also be aware that some converters don't operate properly if they are not connected to batteries. That's not generally true of modern converters, but many of the older ones require a battery or something sort of equivalent (like a large capacitor) to operate at the right voltage and/or to clean up the 12V power sufficiently.
On my RV, apparently unlike many, the converter is wired to the battery side of the disconnect switch, so using the disconnect switch while on shore power results in the battery still being charged but the house circuits having no power. Obviously, physically disconnecting the battery ground lead is still an option with this setup.
