You can't run loads from cells directly, you need a battery and inverters. Or every cloud will fluctuate the voltage and watts massively and your electronics will fry. In the olden days, flickering incandescent would be fine.
It has a single emergency outlet that will provide up 1500w when the grid is down. With the power being down last week from Irma it was able to output at least a 1000w load even with heavy overcast. It will off course shut off if it can't provide the attached load.
If you have a solar system for home its going to have an inverter, but most likely no batteries, some inverters can provide emergency power without them.
Batteries obviously work much better for that scenario allowing them to buffer energy. But nearly all grid tie systems installed do not have batteries due to extra cost and maintenance.
If so, it demonstrates that the article is, uh, not well researched.
The inverter doesn't backfeed for emergency power, it just has a separate output wired to a single outlet for emergency power.
But the article would have us believe that it is illegal to use those inverters in Florida.
Main issue I have seen with the law in FL for them is that they are net metered but the power bill can't go negative. So if they produce more than they use the power company doesn't have to pay them for it, also they always get a service charge no matter what. So their power bill ends up being about $20 a month no matter what which is just the service charge.
Now that 280 watt panels are becoming common, up to 7kw is a "standard" install.
I don't know about three phase.