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Thread: Wind energy

  1. #41
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    Default Re: Wind energy

    Quote Originally Posted by ekkekan View Post
    That is why I posted the Tesup Zeus information. Good to see that they employ the brake in high wind times. The rotary type blades also look interesting. Also many different sizes.
    Those are called VAWT and they don't work. I researched them for MONTHS. Well technically they actually do work - but not quite as well as advertised.

    They are however one of the easiest DIY options. Just google VAWT.
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    Default Re: Wind energy

    Quote Originally Posted by Fluffy View Post
    Probably many similar uses.
    Give us some ideas: shaded parking at Malls?

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    Default Re: Wind energy

    Quote Originally Posted by bigboy529 View Post
    Ja sorry the discussion got a bit mixed up between 1 kW and 3 kW units.

    Point however stands, you are not going to put up a wind turbine whether 1 kW or 10 kW with a 6m pole or whatever and a bag of ready mix concrete. It will need something much more substantial able to take the weight and wind load generated at a specific height, it will probably have to be designed and signed off by a structural engineer, conform to SANS codes, local building regulations, environmental regulations etc. Eventually your support structure might just cost you more than the turbine itself.
    The units they put up on most farms are simply on a pole supported by strut wires just below the turbine blades. The strut wires carry the lateral forces and the pole just keeps it in the air.


    C
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  4. #44
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    Default Re: Wind energy

    Quote Originally Posted by tripodontour View Post
    Give us some ideas: shaded parking at Malls?
    Shaded horticulture.
    Cheers

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  5. #45
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    Default Re: Wind energy

    Quote Originally Posted by C Africa View Post
    The units they put up on most farms are simply on a pole supported by strut wires just below the turbine blades. The strut wires carry the lateral forces and the pole just keeps it in the air.


    C
    Yep, and how big are the turbines. These are mostly your typical 200W to 500W.
    Cheers

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  6. #46
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    Default Re: Wind energy

    I am all for better solutions, but I do believe that this site https://www.tesup.co.za/ is a bit of a rip-off.
    Yes, the graphics and everything looks extremely professional, but once you start reading the details, I get worried.

    So they say "World's best wind turbine charge controller with fully automatic wind turbine protection and a manual emergency brake on it. These are one of the most advanced charge controllers in the market today. " yet, you can only adjust the voltage output and that is via a pot. Come on!!!
    Where is my current limiting function or my brake controller?

    Both the 5kw and the 3kw unit is given with the same rotor diameter of only 2250mm!!!
    At least the tail on the 3kw unit is 1970mm, which seems ok, but on the 5kw the tail is only 1550mm

    Buyer beware.


    2007 Nissan Navara 4L Auto - Worshond


  7. #47
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    Default Re: Wind energy

    Quote Originally Posted by C Africa View Post
    The units they put up on most farms are simply on a pole supported by strut wires just below the turbine blades. The strut wires carry the lateral forces and the pole just keeps it in the air.


    C
    Quote Originally Posted by Fluffy View Post
    Yep, and how big are the turbines. These are mostly your typical 200W to 500W.

    And those guy wires are attached to anchors concreted in to the ground. Usually a guy wire anchor requires a bigger / stronger concrete base than the tower / mast itself due to the forces involved.
    So mast plus 3 or 4 guy wires, 4 or 5 cubes of concrete, rebar in the ground, anchors, guy cable, it quickly adds up.

    I could be totally missing the pot here since I don't have experience specifically with masts for wind turbines, but I have quite a lot of experience with masts for antennas, I doubt the 2 differ by very much.
    I actually think wind turbines will need something even more substantial than antennas, wind turbines have a high wind load, the whole idea is for the wind to move it, where they try to get antenna wind load as low as possible by design. Then of course there's the movement as well.
    "The man who does not read has no advantage over the man who cannot read" - Not Mark Twain

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    Default Re: Wind energy

    Quote Originally Posted by RoelfleRoux View Post
    Noise??
    No permission from town board and aesthetics.I never saw it ,he just told me but i dont think it was like a fan, more like a squirrel cage.,vertically.
    Last edited by plunger; 2021/10/18 at 04:30 PM.

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    Default Re: Wind energy

    2 blade generators are much more noisy than multi blade ones. For house use it also do not need to be that large because its producing 7/24.
    Sovanious rotors are low speed and quite silent.

  10. #50
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    Default Re: Wind energy

    Quote Originally Posted by ZuluCowboy View Post
    I don't know much about this topic, but just out of curiousity, how would say a Climax windmill work connected to a car's alternator work, or not?
    Not sure how much kw a windmill produce but a 90A car alternator would be nothing for it I think. When using a car alternator you make some changes to make it self exciting at lower speeds without a battery exciting it. You can buy alternators that are converted.

  11. #51
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    Default Re: Wind energy

    Quote Originally Posted by bigboy529 View Post
    And those guy wires are attached to anchors concreted in to the ground. Usually a guy wire anchor requires a bigger / stronger concrete base than the tower / mast itself due to the forces involved.
    So mast plus 3 or 4 guy wires, 4 or 5 cubes of concrete, rebar in the ground, anchors, guy cable, it quickly adds up.

    I could be totally missing the pot here since I don't have experience specifically with masts for wind turbines, but I have quite a lot of experience with masts for antennas, I doubt the 2 differ by very much.
    I actually think wind turbines will need something even more substantial than antennas, wind turbines have a high wind load, the whole idea is for the wind to move it, where they try to get antenna wind load as low as possible by design. Then of course there's the movement as well.
    Actually they just hammer a 1 meter steel fence pole into the ground and that does it. They use the same mechanism to anchor fences, so farmers know all about the forces that such a peg can handle. The one my neighbour has is a 750 watt.

    C
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  12. #52
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    Default Re: Wind energy

    Quote Originally Posted by bertus View Post
    Not sure how much kw a windmill produce but a 90A car alternator would be nothing for it I think. When using a car alternator you make some changes to make it self exciting at lower speeds without a battery exciting it. You can buy alternators that are converted.
    The problem is the RPM's. You cant drive the alternator directly off the turbine shaft. Even if modified for permanent magnet.

    Somehow you have to get the alternator into the several thousand RPM range. Which is why your car alternator has a high ratio pulley arrangement with the crank pulley.
    Cheers

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  13. #53
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    Default Re: Wind energy

    Quote Originally Posted by Fluffy View Post
    Those are called VAWT and they don't work. I researched them for MONTHS. Well technically they actually do work - but not quite as well as advertised.

    They are however one of the easiest DIY options. Just google VAWT.
    Fluffy could we please learn from your knowledge/experience. Here are some of the specs of the Zeus 3kw.
    Weight 24kg and size of blades 2.25m diam.
    Max speed: 1200rpm
    Even if the output quoted at a wind speed of 10 m/s of 1365W is in fact only 1000W will it not make a good contribution in PE with good wind for 7 months of the year and some of it will be when no solar available. The points of high maintenance is well taken and that regular inspections needs to be done to get an early warning of bearing failure.

    CLAIMED OUTPUT:
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    SPECS:
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    MOUNTING:
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    It does seem like the 3kw Zeus can be mounted with 3 stays and pole. Some pics show stays anchored to a wall where space is limited.

    Looking forward to your specialist input.

  14. #54
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  15. #55
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    Default Re: Wind energy

    Quote Originally Posted by Fluffy View Post
    The problem is the RPM's. You cant drive the alternator directly off the turbine shaft. Even if modified for permanent magnet.

    Somehow you have to get the alternator into the several thousand RPM range. Which is why your car alternator has a high ratio pulley arrangement with the crank pulley.
    Easy to do

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    Default Re: Wind energy

    Quote Originally Posted by bertus View Post

    There we go --- just what I was, err warning against.

    It doesn't actually work or exist.

    Be aware, or maybe beware.

    Promise, I have researched these things for tons of hours. Literally. It's part of what I do full time as a hobby and living.

    I have never seen one successfully deployed. Nowhere.

    They and all the other alternative operation wind turbines show great promise, but hey haven't got there yet.

    You wont see them deployed by those that know anywhere.
    Cheers

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  17. #57
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    Default Re: Wind energy

    Quote Originally Posted by bertus View Post
    Easy to do
    NOT.

    All of a sudden that simple shaft connected to an alternator becomes a shaft alternator gearbox combination.

    So it can be done, but it's not simple and it's not cheap or maintenance free.
    Cheers

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    Default Re: Wind energy

    Quote Originally Posted by ekkekan View Post
    Also at over about 70kmh gusts the brake is activated. Bear in mind the 3kw is generated at below 70kmh. At 22kmh wind it already generates about 300W at 48V.
    This for me is the issue. 22km/h sustained is quite the breeze for only 300W. Just how often does the average house experience that? 22km/h gusts yes, but sustained and “clean” I’ve got my doubts. I lived for two years on the top floor of an apartment building in on the brow in Salt Rock. The wind only stops to turn around in Durban, and yet I doubt it was over that number by much for very often.

    Fifteen years ago every cruising yacht had a wind generator on the back. Now I see almost none. “Everyone” has gone solar.

    A lot of posts here relate to “a bit extra at night”. Doesn’t the wind normally die down at night.

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  20. #59
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    Default Re: Wind energy

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    Default Re: Wind energy

    Quote Originally Posted by BruceB View Post
    This for me is the issue. 22km/h sustained is quite the breeze for only 300W. Just how often does the average house experience that? 22km/h gusts yes, but sustained and “clean” I’ve got my doubts. I lived for two years on the top floor of an apartment building in on the brow in Salt Rock. The wind only stops to turn around in Durban, and yet I doubt it was over that number by much for very often.

    Fifteen years ago every cruising yacht had a wind generator on the back. Now I see almost none. “Everyone” has gone solar.

    A lot of posts here relate to “a bit extra at night”. Doesn’t the wind normally die down at night.
    We do realise it will not be sustained. Storage is key. I have never paid attention to the wind but it does seem it normally comes up in the afternoon when PV is dwindling. Yes may be wishful thinking to get some power when there is no sun at night.
    Still interesting to chat about it and learn even if we never go down that route.

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