The 60a fuse in the #4 wire is not needed. You could short the wires and you would be at 35a max and no harm would come of it.
I would also skip the additional 60a fuse in the 2/0 and just stay with the existing. I believe the existing fuse needs to be closer to 100a to cover the converter and controller. Although I think I would prefer separate and direct connection for the solar and converter to the battery.
Does that WFCO actually charge properly at 14.4 volts when expected?
Simple on/off switch is available for both locations.
