Welcome aboard!!
I'm with Mary B on this one.
Pictures will be one of the best ways at this point.
Taking a wild guess here, those 3 wires goes from the turbine directly into the inverter?
The somewhere inside it is a rectifier that takes it from AC to DC.
Like Mary B said, disconnect that part , get to the 3 wires put a meter on it in AC mode, give it a spin. Try this on all three wires, as such A-B, A-C, B-C , this should give fairly close readings if the "spin" is the same speed for each test.
IT will also give you and us a good idea of what voltages you can expect.
The better test would be to have a known RPM for all 3 tests, if possible a few different speeds to assist in what is possible with what you have.
IT would be nice to have a picture of the entire setup and individual items.
There might be others on here who have similar and assist even more.