i recently repowered a 6kwatt inverter, 208/120 single phase
with a 192vdc front end buss
i also frequently work with 480vac three phase mains, and i have to say
192vdc scares the living beejeesus out of me!
in my opinion, you would be better off with a 48volt version, even those will bite
you, but not kill you dead.
one bad connection, or bad battery cell in the 192volt string can have horrendous
reprecussions should there be a short or some fault like a shorted cell.
if you are comfortable with enormous amounts of power, then by all means have fun.
as for the NEC thing, placing the batteries and inverter in a separate and non habitated bunker or building and then bringing the 120, or whatever to the house
in a conventional manner will negate most of your worries,
as long as the outbuilding does not burn your house down should it catch on fire
you are ok,, but the insurance company will likely not pay off on the bunker or its contents.
bob g