This looks like it should go in classifieds since it only points to an Ebay item, how did you decide it fit in the "wind" category? Just curious. They mention in the listing they were built for solar but no mention of wind is why I ask.

Cheers.

TomW

The Truth is the Truth, even if no one believes it; and a lie is a lie even if everyone believes it

If used as a gen....

You would probably have difficulties getting enough flow with say a small drop (3 ft (1 meter)or so).

But...  say, if you had a good mountain creek that you wanted to dam up and feed all or part into a large pipe (6", 8"???) then plunge 100 feet or so down the hill and reduce and feed into the pump/generator.....

I would imagine that one could get reasonable power generation.

I'd wonder about efficiency.  Of course, this is a very simple system based on equal water velocity on the inlet and outlet.  A turbine, on the other hand is far more complex, but has a high velocity inlet and a low velocity outlet, essentially absorbing all the energy in the system.