Questions about wiring for Samlex inverter/charger/converter

I don't know why they put the Converter on the Fridge breaker.

Myself I'd run a sub panel for the inverter (IN fact that is how my rig is wired) but in your case.. locate the converter and either disconnect the 120 volt in or add a switch in that line (A switch with a lockout so you can pin it off) I think the boondockers are stand alone converters so this should be easy.

I will keep the boondocker in place (Just turned off or ac disconnected) so as to have it when (not if) you need it years from now.