DC-DC Converter or charger or isolated or non isolated...? Which one to use?

Our solar system on our RV consists of a 24V eco-worthy lifepo4 battery bank that originally was supposed to drive the 12v systems of the RV by the way of a Victron Orion Step-Down Converter but our system evolved when we decided to bring in a small Victron Charge controller so that we could utilize the tiny solar panel Forest River gives you in their Juice Pack system which meant I needed a small 12V battery on the 12v side of the down conversion.... I have struggled through a few problems trying to get my head around this whole change and came to realize that there are a few things to consider when choosing a step down converter.

I realize my theory on what was happening with regards to current directions and electrons ect is probably flawed however my thinking on changing equipment directions was sound. I still believe an isolated converter would have maintained the voltage level at a minimum set point similar to what the charger does in power supply mode but I do live having the added control over things with the charger. At the time of this video being published the new charger has been installed and is working exactly as I hoped for some time now.

As I've mentioned before I'm no electrical engineer but we are happy to have our install working really well finally.