Marion County is far enough inland to avoid storm surge but not far enough to avoid the wind and the outages. Multi-day losses after a tropical system are a normal occurrence here, and a permanently installed standby unit with an automatic transfer switch is what covers a well pump and an AC system through it.
The electrical scope is the transfer switch, the generator feeder, and the load management that decides what runs when the unit cannot carry everything. Sizing is the decision that matters most. A unit sized to the whole house costs considerably more than one sized to a managed set of essential circuits, and for most homes here the managed approach is the better value.
Homes on well water have a specific reason to care. When the power goes, the well pump goes, and that means no water at all rather than just no air conditioning.
Technician insight
Size for the well pump first if you are on a well. Its starting current is usually the largest single demand on the system and it is the one people forget.