Good info about the hertz shift, thanks! I'm still debating if we buy a portable generator gas or propane for potential longer outage without sun as you say. Although with events the size of these hurricanes, I've discovered it often makes buying gas or small propane tank refills difficult with sometimes great travel distance needed. We don't really have the space here to keep enough on hand, and don't want to buy or pay for the larger burined Propane tank and setup.
Buying more batteries is expensive though. I'm definitely on a track to buy the bi-directional vehicle charger from Enphase when they come out. That will add at least another day or two for the house if needed and I think give me the comfort level I'm looking for.
We've had a GREAT day today. The weather has cooled enough that we are not running the AC for a couple days and the average power curve looks like this! 56.7 kWh produced and 47.1 kWh exported back to the grid. Woot! Gonna love seeing the power payback next month from days like that.