The voltage of an inductive system is 150- 600 volts, there are 3 transformers that set the transmission voltage. it would take me a few weeks to build and test one for you, as I would want to duplicate your head and flow here on my test bench and dial the system in for you. the cost would be around $700.

You can't use the c-40 at a higher voltage on the turbine with 12 volt batteries. The C-40 should be connected to the batteries and be set in diversion mode with a proper load hooked up to it. The wires from the turbine should be connected directly to the batteries and the charge control just takes excess power from the batteries to keep them from overcharging.

If you buy the rotor only  from that site, you can put it in your existing alternator and then use an MX-60 to track the max power point. but you first need to test the open circuit voltage of the alternator, to do that you would  open all 4 nozzles and check the voltage at the alternator to make sure the voltage is not over about 125 volts with the alternator running unloaded.  the MX 60 can take 150 VDC absolute maximum, and will stop working temporarily at 135 VDC. If your open circuit voltage was 120 vdc, your max power voltage would be around 60 VDC  which would greatly cut your transmission losses.