Being in sunny south Florida you might want to consider the Tesla Powerwall, using their battery pack with solar panel generation.
Here is the link to their quick estimate calculator.
https://www.tesla.com/powerwall
Large scale power outages last far longer than the weather event and down there it seems clear bright skies follow once it has passed. So the back up battery bank tides you over for a day or two until the solar panels start recharging them.
Zoning the house for required critical elec. services would give minimal spec requirements for 24-48 hr period with perhaps a smaller gasoline genset to charge the power wall.
That 27kw presents a high bar with operating costs. Need to run some what if scenarios on the spread sheet. Quick historic research on post weather event follow on conditions and historic outage periods.
Can’t speak for Florida but some power companies and some states really frown on combining a battery bank with a grid-tied system. Makes a lot of sense to me, too, to have a charged battery bank ready and waiting along with solar but Duke Energy does not allow it here in NC.