Hi, I have this wind turbine (http://m.ebay.co.uk/itm/251320008073?nav=WATCHING_ACTIVE&skus=Output:12V&varId=550270984212) in the UK, wall mounted about 18ft, its not in the best position, but it still turns pretty fast, enough to hear the blades spinning from inside, and for it to generate 17VDC (Even though its only rated for 12v). The issue is, when its spinning quite fast, its only generating about 5-7 volts, 7volts plus is when you can start to hear the blades making a noise. I'm just wondering why it has to spin that fast to generate anything? It seems like it needs Arctic winds constantly just to get any use out of it. Is there anything I can do? It generates three-phase AC. If I had a 24v turbine, I'm presuming it wouldn't need to spin as fast to generate about 12-14v? Thanks, Owen.