Hello:
I bought about a year ago a windblue dc 512 alternator. Our site is 320 ft head and 1,3 liters a second; we installed a harris pelton turbine with pitch diameter of 4". The problem is that alternator begins to charge the 12 volt dc bank at more or less 750 rpm, and the turbine needs to develope about 3700 rpm for its optimal efficiency. Then we only obtained a 13 amps charging current. After that, we rewound the alternator stator at 2 turns by coil (alternator has originally 5 turns by coil); after that, we obtained 22 amps charging current at 2200 rpm. Then I thought that rewinding with even less turns (1 and 2, 1 and 2) we would increase the charging current, but this did not happen; instead increasing amp charge, this decreases to 18 amps, and heat the stator, and I want to know what is the matter. In the wind blue data sheets, is shown that these alternators continue increasing its voltage with the rpm's, so I thing that the problem is not saturation effect. Could somebody help me with this? Do we really can extract more power from a wind blue? According to our calculations, we should be getting about 600 watts, discounting the losses. Thanks