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Author Topic: Grid connected turbine on auction site  (Read 4249 times)
ecogeorge
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« on: June 23, 2019, 10:55:58 PM »

https://www.ebay.co.uk/itm/Nemo-Grid-Tie-Wind-Turbine-4000W-4Kw-grid-turbine-with-Growatt-Grid-Inverter-Kit/303171288840?hash=item46966abf08:g:bhEAAOSwcWRc7vyp

Saw this today (no connection  -hope its ok to post linky) -can anyone answer the grid fail question here -what if grid lost and turbine speeds up ? will output voltage be below grid inverter max ??
Thinking these inverters may suit other wind turbines , large voltage range and mppt.
Any thoughts anyone ...........

PS -bought 3rd Windsave turbine today -(got one at x wifes and 2 in shed ) can't help myself  surrender surrender
George
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RIT
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« Reply #1 on: June 23, 2019, 11:27:38 PM »

https://www.ebay.co.uk/itm/Nemo-Grid-Tie-Wind-Turbine-4000W-4Kw-grid-turbine-with-Growatt-Grid-Inverter-Kit/303171288840?hash=item46966abf08:g:bhEAAOSwcWRc7vyp

Saw this today (no connection  -hope its ok to post linky) -can anyone answer the grid fail question here -what if grid lost and turbine speeds up ? will output voltage be below grid inverter max ??
Thinking these inverters may suit other wind turbines , large voltage range and mppt.
Any thoughts anyone ...........

PS -bought 3rd Windsave turbine today -(got one at x wifes and 2 in shed ) can't help myself  surrender surrender
George

Odd to see a solar inverter being paired up with a wind turbine. If you look around the internet for the inverter you can come across diagrams that show overvoltage protection being something to add in addition to the inverter rather than the inverter having it builtin.

All in all, it seems to be a very bad match as the recommended PV power input for the inverter is 3400W, while the turbine can operate at 4000W and the max input voltage for the inverter is listed at 500V while the turbine has a stated max output of 550V. I think most people would over spec. the inverter rather than the turbine to get the best life expectancy from the parts.
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Why bother? - well, there is no planet B
ecogeorge
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« Reply #2 on: June 23, 2019, 11:30:57 PM »

So at 550v turbine and inverter 500v = magic smoke ??
would not the mppt function be useful on a turbine ??
George
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biff
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« Reply #3 on: June 23, 2019, 11:38:51 PM »

4000 watt or 4kw will not sit on top of a scaffold pole.
  It is very sad to still see misleading adds like that.
The prop is 69inches and there is no furling mechanism.
       Biff
       
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todthedog
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« Reply #4 on: June 24, 2019, 05:48:51 AM »

Could it be 400watt not 4kW.

Agree with Biff scaffold pole just not suitable.

4kW would be a sizeable lump.
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brackwell
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« Reply #5 on: June 24, 2019, 06:54:19 AM »

What about guy wires and the electronic brake ?
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oliver90owner
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« Reply #6 on: June 24, 2019, 09:13:09 AM »

4kW from a 69 diameter rotor?  Who is joking?  Even without the Betz limit, they must be up in the howling gale wind speed region!
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Tinbum
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« Reply #7 on: June 24, 2019, 10:00:58 AM »

could it be this. Huh 4000 but 1kW  Huh Huh Huh Huh

https ://www.youtube.com/watch?v=FWAyw1RQ1EE
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marshman
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« Reply #8 on: June 24, 2019, 10:29:31 AM »

Agree it should be classified as 1kW as the video says. Their website spec. states 4kW. The graph shows 4kW at 44mph (20m/s). At 12m/s it shows 1kW which was the rated output of my 1kW Futurenergy (when I had it). It pushed out 1.5kW (actual measured) in 30 mph winds before the tail started to furl. So I guess in theory 4kW is possible but doubt if you would get more than a quick burst in a violent gust in reality - assuming the turbine/tower survives. Also think the 15 year life is pushing it with out some major maintenance. After 5 years the blades on my turbine were pretty tired looking and also quite a lot of corrosion of internal bits.

Interesting idea of having an output that can fed to a solar inverter though.

Roger
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biff
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« Reply #9 on: June 24, 2019, 01:26:17 PM »

 Once I read claims of 4kw on top of a scaffold pole,
                                           Then I am quite content to tolerate a good fairy tale or joke Everything else about the add should be treated with scorn and not allowed near the verges of reality.
   The prop of 69.9 inches in diameter, so blades of less than 3ft. It a joke.It would have problems putting out even 1kw. The true output of that yoke is somewhere between 300watt and a top output of 800watt, You would have to be in the middle of a force 8 at least to get the top whack.
  The thing that annoys me is that young couples who want to go green and save the planet will actually believe this rubbish and throw their money away on it. 15 years lifespan,, hysteria hysteria hysteria
  Our Y/S is built like a tank and has bearing that you would find on a tractor. It has furling gear ,etc  etc,, It weighs 56kgs out of the box and for all its good qualities I had to reduce the prop to 9ftin x 1kw
 order to survive the storms and even when a nasty one rears it,s head I lower the tower because I want to extend the life of it. I believe it is pointless leaving it up to get thrashed needlessly.
   One thing That I have learned down through the years ,is that  95% of the people selling wind turbines never fly them themselves. with each increase in exaggerated specs and ouput the price goes up and up till the final seller is quoting absolute wubbish like the one in question.
  Believe it or not, I will eventually get people visiting me and showing me the pic of that turbine that outputs 4kw. They will say that it is Quare and handy,.All they need is a scaffold pole and it can be fed through the solar inverter. They don,t realise it but they are praying out loud. I used to get annoyed but not anymore. I just say,,trust your instinct.
                            Biff
 
« Last Edit: June 24, 2019, 01:28:32 PM by biff » Logged

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