In short, do not buy! My unit did not produce even 5 watts during the week I had it up, and there were 40-60 MPH wind gusts during this time. Specs state the rated wind speed is 144w m/s…26 mph. This is where it should output 400 watts.
The primary problem is highlighted in the photo of the motor…I believe the magnets are simply not strong enoufh for one. In any case, it is not a quality build, but then what do you expect for $200? At least half the rated power output I’d say.