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SomeoneSomewhere:neb: That apparently doesn't work, since it's on a common bus the 1m of conductor from the Enphase controller to the non-backup load represents a much easier current path than the (say) 200m of conductor to the street transformer, so the draw will be from the Enphase not the grid.
Common bus has nothing to do with it. Your neighbour is also physically connected via a hunk of copper, and it's not compensating for their usage, or for other grid voltage variations.
It's simply whether or not the current goes through the CT on the mains site of the controller box.
That was my thinking as well but another solar user who had asked his installer (who wasn't just the first Harrison's franchisee who was free that day but really knew his stuff) about this was told that that wouldn't work. I couldn't see why it wouldn't work but then see my earlier note about having forgotten pretty much everything I've ever learned about AC power theory.
