I was interested in @drmi 's questions about connecting two ESS systems: https://community.victronenergy.com/questions/10357/two-ess-systems-grid-parallel.html....
I'm looking at a property with 4 x independent off-grid systems, each using a Multiplus 2 and are about 500m apart from each other. I'm interested in connecting these so that the stronger systems can support the AC power delivery of the weaker ones. (One gets great morning sun, and another gets great afternoon sun.) This would classify as island grid I guess. DC Connect is not an option. It appears that the 4 x systems could be connected via their AC-In. I'm also wanting to account for one or more of the systems going offline occasionally. Each would just treat the AC input as unreliable grid. Daisy chaining AC Out to AC In of the next and so on would not really be workable.
Can this be done? If so, do I need the current sense on AC-In or do I need full metering? Do the systems need to be aware of each other via GX? I know I need to configure for ESS, but any special settings needed for feeding AC only once batts are full?