3x 15kw proven turbines production drop off...

hubbahubba · Nov 29, 2023

The last few years we have had a pretty massive drop-off in our turbines. Installed 2012 and normally in the 90000kw but last few years a drop of and this year the worse. They a serviced yearly by a well respected company and 2 had magnets repotted on etc. In central scotland.

Maybe a longshot to find someone with 3 provens but has anyone experiencing similar? Fortunately there at a serious rate this year but 30k kw more would be an extra £20k!

I have been recording data from each of the invertors and there adding up.

I will include there annual generation and wind speed data i got from the met office from local weather station. Everytime i take reading i just get frustrated... last year exactly today only done 61000kw.

workin f nowt · Nov 29, 2023

My turbine not a proven hasn't produced as much this last rolling 12 months as the previous put it down to not as consistent a wind.

Exfarmer · Nov 29, 2023

Has anything changed in the vicinity of the turbines ie. tree growth, new buildings etc

hubbahubba · Nov 29, 2023

Exfarmer said:
Has anything changed in the vicinity of the turbines ie. tree growth, new buildings etc

Nothing, first year i thought maybe just one of these things but not 3 years in a row now.

Exfarmer · Nov 29, 2023

Another point , do you have tracking on the inverters? It may be that you are experiencing over voltage thanks to grid issues ( we have had this on a solar install ) the result was a throttling or total shut down . Also do you track then individually ?

hubbahubba · Nov 29, 2023

Exfarmer said:
Another point , do you have tracking on the inverters? It may be that you are experiencing over voltage thanks to grid issues ( we have had this on a solar install ) the result was a throttling or total shut down . Also do you track then individually ?

Sorry i dont know what that is? I have just been reading the 3 invertors for each turbine.

workin f nowt · Nov 29, 2023

Mine 10kw average 23500 kw per year last 2 years. Changed head 2 years ago. Not sure how this compares

Still Farming · Nov 29, 2023

What was or is wind speed records too possibly?
Did you replace new magnets and stator(core) totally?
What does your service chap or people you had magnets and core off say??
Have you done anything to the rectifer box or renewed anything there?

hubbahubba · Nov 29, 2023

Still Farming said:
What was or is wind speed records too possibly?
Did you replace new magnets and stator(core) totally?
What does your service chap or people you had magnets and core off say??
Have you done anything to the rectifer box or renewed anything there?

The windspeeds i got was from a couple miles away for last 5 years and i broke that down to a daily average per knots.
I think they just refurbished the magnet plates after a couple were cracked or broken off.
Service lads just think its lack of wind, im not sure so last week i had a different company service them but appart from one of the brushes not msking a good contact on the brass flywheel thing on one turbine that was all they found.
I dont think anything like that was changed. I will include invoice.

Mr chips · Nov 29, 2023

hubbahubba said:
The last few years we have had a pretty massive drop-off in our turbines. Installed 2012 and normally in the 90000kw but last few years a drop of and this year the worse. They a serviced yearly by a well respected company and 2 had magnets repotted on etc. In central scotland.

Maybe a longshot to find someone with 3 provens but has anyone experiencing similar? Fortunately there at a serious rate this year but 30k kw more would be an extra £20k!

I have been recording data from each of the invertors and there adding up.

I will include there annual generation and wind speed data i got from the met office from local weather station. Everytime i take reading i just get frustrated... last year exactly today only done 61000kw.View attachment 1150742

We have two Proven installed in 2012. Our did exactly the same slowly got worse. We put new blades on two years ago. Have done more KW than they have ever done.

hubbahubba · Nov 29, 2023

Mr chips said:
We have two Proven installed in 2012. Our did exactly the same slowly got worse. We put new blades on two years ago. Have done more KW than they have ever done.

Mine would of been 2012 too. What sort of generation did they drop of too and what now? Is that the new style blades that have a curve on them? I was told i should try them but at £4k i wasnt sure id worth it. Must be though?

Still Farming · Nov 29, 2023

Mr chips said:
We have two Proven installed in 2012. Our did exactly the same slowly got worse. We put new blades on two years ago. Have done more KW than they have ever done.

When bought was it compleat blades set up being blades, springs plates, boards etc etc

Mr chips · Nov 29, 2023

hubbahubba said:
Mine would have been 2012 too. What sort of generation did they drop of too and what now? Is that the new style blades that have a curve on them? I was told i should try them but at £4k i wasnt sure id worth it. Must be though?

They dropped by about 30%. Yes they are the curved blades around that price fitted. We can get up to max power regularly now we couldn’t before. We couldn’t believe how rough the old blades where very weathered.

Still Farming · Nov 29, 2023

Mr chips said:
They dropped by about 30%. Yes they are the curved blades around that price fitted. We can get up to max power regularly now we couldn’t before. We couldn’t believe how rough the old blades where very weathered.

Fiberglass type?

Mr chips · Nov 29, 2023

We only replaced the blades nothing else. We are near the North Sea but not part exposed.

hubbahubba · Nov 29, 2023

Mr chips said:
They dropped by about 30%. Yes they are the curved blades around that price fitted. We can get up to max power regularly now we couldn’t before. We couldn’t believe how rough the old blades where very weathered.

Thats very interesting. Will they do about 30-40k kw each now?

HAM135 · Nov 29, 2023

This year will be our worst output over 8yrs,last year was best,down 20% this year,summer mths had very little wind this yr.

Mr chips · Nov 29, 2023

I don’t think they are fiberglass Not sure to be honest.

Still Farming · Nov 29, 2023

hubbahubba said:
The windspeeds i got was from a couple miles away for last 5 years and i broke that down to a daily average per knots.
I think they just refurbished the magnet plates after a couple were cracked or broken off.
Service lads just think its lack of wind, im not sure so last week i had a different company service them but appart from one of the brushes not msking a good contact on the brass flywheel thing on one turbine that was all they found.
I dont think anything like that was changed. I will include invoice.View attachment 1150765

I guess you live by the manufacturers up there do you too?
Didn't know they refurbished or stuck new magnets on?
New magnet plates build up in resin now compared to old one?
So old stator core the same is it?

Mr chips · Nov 29, 2023

hubbahubba said:
Thats very interesting. Will they do about 30-40k kw each now?

Yes unbelievable the difference. We also lost output when we had the new thicker shafts fitted six years ago.

3x 15kw proven turbines production drop off...

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0 %

Up to 25%

25-50%

50-75%

75-100%

100% I’ve had enough of farming!

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