Will multiplus 2 work with my original rv converter?

Do I’m rebuilding my off grid system. Originally I ran off a 2000 watt inverter and auto transfer switch. When I did this I unhooked my converter and tied into the system I was building.

Now I’m going to a multiplus 2. I tore it all apart and found out none of my dc works probably cuz I unhooked my converter. So my plan is to rebook the converter up.

I’m going to be installing a switch to bypass the multiplus during the winter so I can take my batteries out and still have power if I need to get into camper.

So my question is. Do I leave my converter hooked up? Or is there something else I need to be doing so I still have power with multiplus switched off and no batteries.

If it is mains voltage you need then this is the way.

So yes I need to hook it up to converter correct?

and when I put batteries back in in the spring do I leave converter hooked up?