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Wind Generators - Vertical vs Horizontal
#1
With minimal rooftop room I have been pondering other options for supplementing power generation. We have more than enough wind, so I figured that might be a complementary source of power. 

I have been looking at several vertical axis wind generators, including those with magnetic levitation. I am a complete novice with wind generators, so was wondering if anyone else had investigated the options? 

I've read vertical is not as efficient as good old propeller blade generation, so am interested to hear what you think? Including wind generation products that you think are worth a try. I've seen there are loads of chinese products available only, but what to purchase?

Thanks for your help  Smile
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#2
If you're in a tight area with trees or buildings around, you want to go with a VAWT. It can handle turbulent winds without any issue.

Yes, the VAWT isn't quite as efficient as a HAWT, if the wind is identical. But put them in their own elements where they shine, and they will out perform each other in their respective fields (literally).

A HAWT works very well in open fields with lots of room to allow the winds to settle and more-or-less blow in a straight line.
A VAWT works very well in low areas or near trees/buildings that are within a few hundred feet/meters, in all directions.

So on a farm with no trees around, a HAWT. If near a forest or hills or suburbs, go with a VAWT.

A VAWT built with two moving plates, one with magnets that are turned by the blades and one that has coils below it, is one of the most efficient ways to build them. The discs lay horizontal and turn above the coils (there are some versions where there are actually two discs of magnets sandwhiching the coil disc, this gives higher output)
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#3
Basically your after a 3 bladed turbine, as long as the tip noise is not an issue. They are the best $/kW and $/kWh value, the main issue is getting a controller that works with the turbine properly. Otherwise a vertical or a 3 blased turbine with a ring around the edge of the blades but these are limited to about 400W due to the size.

A lot of the smaller turbines have nice specifications upto 15-20m/sec and then leave you guessing as to what happens next, only saying turn the unit off (brake/short the output) before a storm (15m/sec a storm ???). This seems to be more down to the use of controllers that do not track the power profile correctly and limit the power draw to the maximum current the turbine can handle, which then over heats as a result of too much current draw (lots of youtube videos of people with burnt out coils and dislocated magnets from overheating). The unit I have has a brake voltage level with no regard as to the current, no other settings available to chage.... which will be used for testing only next month before switching to a different grid tied unit setup that allows the current level to bet set at different voltage levels.

I have not seen any details about what the actual maximum survival rpm speeds are for turbines... but one guy has one in 100km+ winds still running.

The cheap Chinese units that are used on street lights, as a thought, check the last few typhoon paths and see if any of the areas hit had them up on the lights and how many were left working.. off to google...

I'm thinking your not the middle of town ?
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#4
You might like to have a read here:
http://www.thebackshed.com/windmill/home.asp
Heaps of good hands-on info :-)
Running off solar, DIY & electronics fan :-)
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#5
Thanks for the feedback and info folks. Redpacket I went to the back shed site and found the maglev vertical axis generator, which I will investigate further. Looks good, so maybe an option. I've sought a price on the CXF-600, so will go from there.



Interested in everyone's thoughts on above?
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#6
(09-18-2018, 09:37 AM)Redpacket Wrote: You might like to have a read here:
http://www.thebackshed.com/windmill/home.asp
Heaps of good hands-on info :-)

Bookmarked! Wink
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#7
A very temporary test to make sure everything works before trying to put it 11m up on 3 poles (>300 miles away)... 2m diameter, 700W, sets on fire at 900W.. lol..



And a completely unconventional setup... still have a small buck, fan array and the manual brake switch to connect.



I had thought that putting a tubine on a hydaulic mast would be better, because when it get's dark you raise it up and before dawn take it down. Nobody would know it is there (appart from the WTF is that noise !!!)
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#8
Is that a solar MPPT controller I spy ?
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#9
I did think it was not an MPPT in any way as it seems to just charge based on the voltage waveform... starts charging when the AV input is ACvolts / SQRT(2) - i.e. it starts charging as soon as the peak voltage goes above the battery voltage, so just connecting to the battery directly.

Loads of "MPPT" controllers on eBay and Ali are anything but MPPT. Maybe Maximum Purchase Price Testing... so had to open it up...


I stand corrected, as there is one inductor tucked in the back of the unit and another componet I can't figure out what it is, although the inductor is probably for the solar, so will have to test that next month. I took one of the ends off the case to have a peek, can't see the traces on the PCB so have no idea as to the wiring layout internally. The other end I can't fit a screwdriver in the gap to open it up.

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#10
You'll get very very poor results using a controller like that with a WT, unless it has a user definable option to manually enter a power curve.
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