Will be upgrading a 5th wheel from FLA to LFP batteries, along with a MultiPlus 3000VA 12v 120a replacing the current AC/DC converter and 1200w inverter.
Completing the install in stages would make things easier and maintain RV use during nice weather.
Any issues with connecting AC In/Out to the Multiplus without being connected to batteries, and will the transfer switch pass-through AC power?
I'll do the same thing during short storage intervals with a disconnect switch to maintain batteries below 100% SOC, while allowing AC to a residential fridge.
If this works fine, what position should the panel switch on the Multiplus be in when disconnected from batteries?