Can we talk about a BASIC UNIVERSAL simple PV kit for preppers.

[Skvez]

Most wind controllers have a dummy load (resistor bank) that they 'short' across the wind turbine when the battery bank is full. Without this the wind turbine can overspeed and be damaged.

I don't think there is a simple "yes" or "no" with regards to whether regulators can be operated in parallel into the one battery bank. It depends on the regulator, some may be able to others can not.

A grid tie wouldn't be operating at 11kV unless it was a very very big system, much bigger than anything we would be considering. If the power comes into your house at 230V then you would export (to the utility) at 230V.
Some of the cost is the protection required for a grid tie. A los off mains relay is required to ensure that if the line is broken that the 'load' side generation (your solar grid tie) disconnects very quickly. Otherwise someone working on the line could be injured since they wouldn't be expecting power to be coming from the load. Also once you are disconnected you will lose synchronism with the mains. If the mains was to reconnect your system would be damaged. These relays can cost about £1000.

You also require a grid tie inverter that can match the Voltage of the mains very closely and control the amount of power exported, these are much more expensive than a simple inverter.

And you need a new meter that can count 'units' going both ways (imported and exported)

Unfortunately solar systems seem to be designed either for feeding battery (disconnected from the mains) or mains-tie with no battery back-up. Systems capable of both are uncommon and therefore cost more. For most preppers we should forget the grid tie, especially if we've EMP concerns. Install a separate DC lighting system somewhere to use the power before an event and know that it's available for other things after an event.