Should solar and battery resources be shared?

But for several reasons, I’d like them to share Solar and battery resources with each other, and do away with one of the utility services. One reason is that the buildings are occupied and used differently; sometimes one of them uses a lot of power over a few days, then is dormant for a week or two.

Should I use a paralleling control connection across 200 feet?

Yes Using a paralleling control connection across 200 feet sounds like a shitshow recipe. You could still have a less expensive inverter or micros at the other location to take advantage of the roof space for panels. That’s basically what I’m doing.

Can a Bldg A and B a battery be connected together?

Probably require larger wire between, so it may not be sensible, but if either system were capable of running the local load, it might be possible to keep the batteries close to the same charge level with a link between. Bldg A has SCC, inverter, battery, as does Bldg B, with the two batteries tied.

How do parallel inverters work?

The parallel inverters each have 200-amp pass-through, and would feed the main panel for that structure. Off that main panel, we would run an underground feeder cable to the second structure, where it would run into the grid lugs of the inverter there. That inverter would feed the main panel of the second structure.

How would a two-inverter system work?

That inverter would feed the main panel of the second structure. In essence, the two parallel inverters would form a sort of mini-grid feeding the solo inverter and providing their excess capacity when needed, and the solo inverter could become AC-coupled power to the two-inverter structure when needed.