MAKEMU Energy Domestic mini micro vertical axis wind turbine generator SMART WIND 300/400 / 500 W savonius multi blades for home garden roof

Hello, I got this vertical axis wind turbine as a present from my better half. I have just tested it half-assembled, without blades attached; but I did attach the three radial arms for the ease of rotating the shaft by hand, and measured voltage and amperage produced. Here is what I discovered.It does actually generate some tens of volts easily, once I even managed to spin it so quickly that my multimeter registered 101.5 V on the MAX setting. Before that I got normal 12 V by rotating the shaft slowly with my fingers, and was kinda pleasantly surprised. However, don't get too excited about the high voltage yet, because there is one BIG CATCH - the supplied M10 three-phase alternator (motor-generator) which presumably is capable of producing 100W of power (max rating I suppose), appeared shy to produce more than 0.185 A (i.e. only 185 miliampers!), irrespective of how fast the shaft is rotated. In fact, I got 150-170 mA again easily at virtually any rate of rotation, but to reach the max registered 185.5 mA I had to work hard (as hard as for 101.5 V)...The moral is, this wind-turbine only looks powerful by the kinda "impressive" voltage figures but is very much powerless in all actuality, because electrical power (Watts) and, for that reason, energy (Watt-hours) is measured as the product of Volts and Ampers (in this case miliampers), i.e. in this case maximum we get is something like 100V*0.2A = 20 W, and this is *at best*. - Well, having my educational background in physics, I have all the reasons to doubt that it can produce max voltage at max current; the physics (electromagnetism and induction laws) simply won't allow this to happen - for a practical test, one can easily check that it's much more difficult to rotate the generator's shaft under any appreciable load demanding current (i.e. not just a voltmeter).Overall, I conclude that this wind-turbine must have been produced as a toy, may-be good for educational purposes (although considering its size I would doubt its usefulness even for that). It is a shame that the manufacturer advertises it as a proper "green energy" solution, claiming that this micro-turbine starts producing "power" in low wind. It only produces mostly useless voltage in any wind conditions, and it's only usable, perhaps, for occasional LED applications (in strong enough winds), where current must be well controlled and kept low. Forget about charging any serious battery or its contributing to a solar-battery array!