Scroll with me for a moment.
See those devices in the bottom of this pic?
They are the same photograph, just rezised.
The first video on how to extend the blades... The thing is so flimsy it cannot sustain wind. Look at my attachment. The blades cannot sustain themselves at a 120 degree angle. (granted, maybe with centrifugal force they do, but how are they preventing oscillations?) Do you think something like that is ready for manufacturing?
And lastly, NONE of the turbines, not even the 2.5kW one, stand more than 2m above the ground. Anyone who's ever read about wind turbines knows that at this sort of height, the available wind is piss poor. The higher you go, the more wind you get. And this is critical, because the power that is generated has a cubic relation to wind flow:
https://en.wikipedia.org/wiki/Wind_turbine_aerodynamics#/media/File:Lee_Ranch_Wind_Speed_Frequency.svghttps://en.wikipedia.org/wiki/Wind_turbine_design#Power_controlWho in their right mind would then go and design turbines that stand from 1 to 3m off the ground?
This is a graph of airflow versus height
According to the source, this graph is for countryside areas, that is, relatively flat. On a suburban environment as shown, getting anything useful and reliable on the ground would be impossible in most cases, unless you're in an urban canyon that somehow concentrates a lot of airflow in one zone.
http://wind-energy.tripod.com/siting.htmlIn general, for wind generation, the higher you go, the more constant wind you will get. For domestic applications, smaller blades are okay, but generally, you want larger, lower RPM blades so that you don't affect birds and so that you don't get a lot of noise.
So it would not make sense at all to have a small wind turbine a bare meter off the ground.
Other concerns?
***The turbines depicted in the video move suspiciously slow given their size. You would expect a small turbine to spin very fast, but these spin at less than 60RPM. Doesn't compare to any small turbine that I have seen.
***They also claim 2.5kW is enough for a house. An air conditioning unit or heater would say otherwise.
***At a 2 year warranty, I would not conside the 1kW and 2.5kW models at all. These are supposed to compete against the 20 to 25 year warranties offered by solar panel manufacturers.
When you are doing projects involving payback and other engineering economy matters, you should assume that the lifetime of a device is as short as its warranty, as a worst case scenario and as a way to protect your investment.
Thanks to the IEEE Dominican Subsection for the trip to Los Cocos eolic park. Learned hell of a lot from that.