Are all the MPPT charge controllers from the inverters individual or are they hooked up to each other?

If you use more than one Any-Grid PSW-H unit then each one will handle its own PV array and the PV modules may not be inter-connected between more than one unit. So if you are multiplying the number of devices you are also multiplying the number of MPPT’s and the MPP trackers work independently of each other. This optimizes the PV harvest with partial shading or other suboptimal situations.