Confused walking into an incomplete off grid setup
I recently purchased an off grid place and it has some existing solar equipment setup. From my limited knowledge, It is a 24V system with 12-2VDC batteries connected to an Outback FM 80 charge controller. There are 4 Sun-A-205-fa3 panels with the wiring all just electrical taped together (Really want to get this fixed). I have 4 additional, matching, panels that need to be installed. I want to add these four panels and get the entire array setup correctly but I am having difficulty in finding the knowledge to do so.
With a 1640W setup of 8 panels what is the best way to wire
these? Two strings of series put in parallel?
What combiner box should I be using and what gauge wire to the house? (150 foot from array to charge controller)
The system is also using a VFXR3024E inverter. I have a second one in a box that I am guessing the intent was to stack with the installed at some point.Does this system seem balanced and where should I focus on improvements?