Thank you all for the info. More info, a novelette....
I've rewired our house into several independent 100 and 200 amp panels, split loads according to priority, and balanced the loads on each leg of the panels. Those panels are wired into a master panel with individual sub-panel breakers, and generator input. We have had a lot of nature related power outages here. The last big one over 2 weeks long. Lots of 2-6 hour outages. So I started with battery backup systems because they interest me, while I finish up the work. Have a 48v Victron off grid inverter, going to buy more. Building 24 and 48 volt battery banks, but have the idea to go higher voltage at some point. We have no interest in grid tied solar. Our number one goal is to avoid losing heat in winter. The amount they pay you here for grid tie is ridiculous, and the bureaucratic headaches double the price of the system.
Have solar hot water panels on site to be erected as soon as the weather warms up. Enough to keep our house from freezing in winter. It is -16F here now as I type this. The solar panels I'm buying are bi-facial, 375w, 49v open circuit. Have a difficult solar site due to tree shading. Very good Eastern exposure, good Southern especially in winter. Zero Western, due to trees, unless roof mounted panels. Historic home, roof mounting not desirable, but have considered a ballasted system. Cannot in any case drill holes in that roof due to cathedral ceilings. Planning to erect multiple, pole mounted, ground mount systems facing E, SE, S, SW. First one will be SE. That one will house 3 large hot water panels, and probably 6 PV. They are 3/8" difference in height, same width.
Been looking really hard at that Tabuchi Enetelus 25kw inverter Battery Hookup is selling for $1000, plus shipping. I researched Tabuchi (Japanese) a lot, and they make very high quality products. The US operation closed down in California so a bunch of those inverters are sitting around. That model has 6 MPPT strings, and (6) 4.1 kwh inverters. MPPT range is 500 watts, system start-up is something like 140. Have to double check that. Massive overkill for my project, but lots of positives. Don't need 3 phase, but I have a 3 phase distribution panel with breakers sitting in storage, a 3 phase disconnect, and I can buy a transformer for $300-$600. The Tabuchi allows you to shut down and work on one string, while still keeping the others online producing power. I'm also very interested in the much cheaper Delta H6. In all cases, my intent is to generate power for our consumption, and gradually feed multiple smaller PV systems into our loads, and batteries. With my recent battery purchases, I'm now at about 60kw. Will buy much more than that. If possible, I will go off-grid, but have a grid connection for back-up.
Also want to mention that I'm seriously considering buying a cheap, small commercial building that has a super good solar site, and an ideal roof structure to put it on. Or, ground mount. 3-phase service runs right past the building, so would hook it up to 480v. The electrical in that building is woefully outdated, and would be torn out immediately after purchase.
The Tabuchi allows for direct wiring to the unit, without combiner boxes. A real downside would be lack or service,lack of warranty. I'd probably buy a spare.
Please, fire away with suggestions.