Operahouse. I looked at DC Side Diversion Load options and Leterblow's Fet circuits. I am not knocking those approaches. There are 14 ways to skin a cat. I wanted something that ran unattended, partially braked the Turbine in overspeed conditions, automatically dumped excess voltage while capping charging voltage, highly reliable, and required few parts. I like the Keep It Simple approach.
SCR's run cooler than MOSFETS, and in my circuit, they cycle ON/OFF on positive AC cycles, and only when the voltage exceeds the Zener/PNP trigger voltage. Since wind speed is variable, the SCR's only get invoked to protect the Turbine and Batteries when the voltage limit is reached.
The dual 300W Dump Load Resistors are providing the load for the Turbine when the SCR's are triggered, and it that respect, they become similar to the standard diversion load found in DC side circuits.
I think my circuit is simpler, more reliable, and meets expectations.