The Sol Ark is flexible. I spilt up my main electrical panel, a "sub panel" that has all my 110/120 loads. (aka my critical loads panel) and the main panels is all my 220 loads. We have a less friendly "Net Metering" set up. The base fee is $35.00 (almost double our base fee) and we only get about a 1/3 of the cost credited for sell back. So, I would have to produce 3x more power to break even. They also have some odd Max usage fee if you use more then X kw's. (They can charge several $dollars per KW used). Our Grid is very stable, so not really worried about it.
There is only a couple months a year that we run the A/C. The Sol Ark from what I have experienced is more than capable of running a significant number of electrical loads simultaneously. This year my plan will be to either set up dual 3.5 tone A/C units, or Multi-Zone Back up Mini-Split...... OR.... Add a Second Sol Ark.... Kinda depends on the out come of our Local "Lottery"....