@starchy The inverter, battery pack and system side of the solar charge controller are all in parallel.
The most orthodox way to arrange that is with busbars.
Considering that 3000 watt inverter's draw, this is a good option
Connect batteries to the Lynx DC distribution system with the Lynx Power In, a modular DC busbar. Find a dealer nearby.
www.victronenergy.com
The battery pack should be fused as close to the positive terminal as possible.
All the other components are fused at the busbar.
Its good to have a means of disconnect between the solar charge controller and the panels.
You might also want one between the battery pack and the positive busbar.