A great many homes in Florida and elsewhere are equipped with PV modules and a grid tie inverter.
Such systems reduce utility bills and reduce pollution from the burning of fuel in power plants.

They absolutely rely on a grid connection to work. Such systems simply wont work without a grid connection.
It is not simply a case of "flicking a switch and dealing with the consequences later"

Even if you could find a way to illegally bypass safety features, a grid tie inverter simply wont produce line voltage and line frequency without a grid connection.

If backup power is required, then a different type of system is required, known as a self contained off grid system.
These systems are normally fitted to remote premises without utility service.
I am not aware of any prohibition on installing such a system in grid served premises. They consist of one or more PV modules, a battery bank and an off grid inverter. Rather expensive for standby use, but perhaps worth considering.
Small of grid systems can be purchased for fitting to boats, motor homes, travel trailers, and remote cabins.