Will look at them. Thanks for the pointers.
I am currently trying to figure out if their US split phase units (example MIN10000TL-XH-US) will work on the delta 208 VAC 3 phase power I have. They show L1, L2 and N connections, and the N will not be stable between L1 and L2 (60 VAC wander as you noted) due to the 120 degree phase shift. N and PE will be stable, however, since they are bonded at the main panel.
Before committing to that, I would want a wiring diagram from the inverter maker showing it can be wired that way. The wandering N concerns me. Maybe that's is a non issue, or maybe it is fatal. I have emailed Growatt to ask about this.
A hopeful sign is that the Growatt units for the US market have 208 VAC numbers in them (somewhat derates their power output versus 240 VAC), and the only reasonable way you get that is by touching two phases of a 3 phase system. So there must be a way to use them that way or why would they give both 240 VAC and 208 VAC numbers?
Interesting.
It would take a lot of capacitance to make meaningful current at 60 Hz. At 100 nF (way more than one would expect), at 60 VAC wander, looking at 2.2 mA RMS current. Not a big deal.
I have a neutral. 208 VAC 3 phase wye. A "proper" 3 phase inverter is an option, but seemingly less choice and not as cost effective. Also, if I put in 6 Growatt single phase units and lose one, I don't lose the whole array. Also, having a spare inverter is cheaper if it is a smaller single phase unit.
SolarEdge has something, SE50KUS.
Main bug is that is requires SolarEdge optimizers at each panel. Apparently, it can't work without them, perhaps the units rely on the optimizer for MPPT functionality. Those units appear to be ~$100 per panel, which is budget busting.
I'm really trying to avoid MLPE boxes if I can, just extra parts, connections, failure points. I also don't like the everything in one box architecture if I can help it.
Ideal for me is a cost effective grid tied 208 VAC inverter in the 6 to 12 KW class that will drive 2 phases of a 3 phase system.
Mike C.