Navitron Renewable Energy and Sustainability Forum

HYDRO TURBINES => Hydro Turbines => Topic started by: camillitech on January 12, 2021, 09:17:09 PM



Title: Community Hydro
Post by: camillitech on January 12, 2021, 09:17:09 PM
Well chaps,

it's been a long time in the planning but at last our island is heading towards its long awaited goal of drawing some power from the abundant rain we are blessed with here on the West Coast. https://www.raasayrenewables.co.uk/index.html#readmore Pleased to say my son is actively involved and on the board as well as other young blood from the island. Young Camillitech has had plenty of hands on experience with his Dad right enough.

(https://lifeattheendoftheroad.files.wordpress.com/2011/10/021011012_thumb.jpg?w=611&h=459)

Cheers, Paul

 


Title: Re: Community Hydro
Post by: Philip R on January 12, 2021, 10:38:30 PM
Had a look at the website.
Under CO2 emissions, they saved "127 cubic tonnes". Over the last year. Not heard this combination of units before.


Title: Re: Community Hydro
Post by: dan_b on January 12, 2021, 11:16:47 PM
Wonderful news.  Congratulations!


Title: Re: Community Hydro
Post by: todthedog on January 13, 2021, 06:07:59 AM
Fabulous well done to all involved.


Title: Re: Community Hydro
Post by: offthegridandy on January 13, 2021, 09:53:01 AM
Hi Paul, it must feel really good that your investment in the young one has not been wasted.

Good luck with the fund raising/share issue.

Andy


Title: Re: Community Hydro
Post by: oliver90owner on January 13, 2021, 10:24:58 AM
Had a look at the website.
Under CO2 emissions, they saved "127 cubic tonnes". Over the last year. Not heard this combination of units before.



Ha ha! I didnít notice that one, but I did note they were only predicting running at an average of 50% of installed capacity - and wondered why. 

Also, £958k (already £307,700 + the additional £650,000) seems quite a lot for an installed capacity of only 137kW (or the actual predicted average output of ~60kW (520MWh/annum).




Title: Re: Community Hydro
Post by: biff on January 13, 2021, 12:59:08 PM
Great news Paul     
        Well done.
      Biff.


Title: Re: Community Hydro
Post by: billi on January 13, 2021, 01:30:44 PM
Good stuff Camillitech and Camillison  ,  thumbs up and  :genuflect 


Title: Re: Community Hydro
Post by: pantsmachine on January 13, 2021, 04:52:21 PM
Good to see! Well done. :)
I'd invest at 4.5% pa variable on BOE rate with a cap or 4% fixed and 1st return in 2022, can't as is now. Nonetheless I wish you best of fortune and much clean power!


Title: Re: Community Hydro
Post by: pdf27 on January 13, 2021, 06:14:12 PM
Ha ha! I didnít notice that one, but I did note they were only predicting running at an average of 50% of installed capacity - and wondered why. 

Also, £958k (already £307,700 + the additional £650,000) seems quite a lot for an installed capacity of only 137kW (or the actual predicted average output of ~60kW (520MWh/annum).
Reading the prospectus, there is a 50kW grid limitation on Skye for the next 3 years - so output is limited to island consumption + 50kW, and they mention there is spare capacity to use on the island as a result. If the grid gets reinforced, they can generate rather more.


Title: Re: Community Hydro
Post by: camillitech on January 13, 2021, 07:46:27 PM
Ha ha! I didnít notice that one, but I did note they were only predicting running at an average of 50% of installed capacity - and wondered why. 

Also, £958k (already £307,700 + the additional £650,000) seems quite a lot for an installed capacity of only 137kW (or the actual predicted average output of ~60kW (520MWh/annum).
Reading the prospectus, there is a 50kW grid limitation on Skye for the next 3 years - so output is limited to island consumption + 50kW, and they mention there is spare capacity to use on the island as a result. If the grid gets reinforced, they can generate rather more.

Aye PDF,

once the grid is upgraded, things will improve and there is talk of using some capacity locally via the distillery during the day for heating the stills and the ferry overnight for charging the batteries. Hallaig uses around 750kWh per night, be really useful if we could charge her up from 'locally grown' electricity  ;)

Cheers, Paul


Title: Re: Community Hydro
Post by: brackwell on January 14, 2021, 08:16:01 AM
Hallaig, the ferry, cant be easy to charge 750kwh from a 50kw supply overnight. How long is night up there. ???
Ken


Title: Re: Community Hydro
Post by: biff on January 14, 2021, 09:10:21 AM
But I will be a great help Ken.   
  The Ferry will ensure that there is always some place to put the surplus. It is a brave venture.
      Biff   


Title: Re: Community Hydro
Post by: brackwell on January 14, 2021, 09:58:10 AM
Biff,

Regardless of the source of the leccy charging 750kwh from a 50kw supply is 15hrs not counting losses and battery charging tailoring off with SOC. I guess multi chargers but then only one mains cable covering all the chargers. A bit of a load. Just wondering.  Ah, perhaps the 50kw is per phase but still.


Title: Re: Community Hydro
Post by: Countrypaul on January 14, 2021, 12:32:34 PM
Hallaig, the ferry, cant be easy to charge 750kwh from a 50kw supply overnight. How long is night up there. ???
Ken

But why limited to 50KW?  The Hydro is lmited to 137KW and therefore the charge could be 137+50 = 187KW (Ok assumes no one on the island uses any other electric),  so only needs about 4hrs  ;D


Title: Re: Community Hydro
Post by: billi on January 14, 2021, 02:12:31 PM
....  i guess the diesel generators , can help too to recharge  , a few crossings a day are only on battery power

I remember  Paul posting  battery PŲrn  pics here  in relation to the ferry

power to gas  will be an option one day too


Quote
he hybrid diesel electric propulsion system will use at least   20% less fuel than a diesel mechanical propulsion system  operating at design speed and with the vessel fully loaded, resulting in at least a 20% reduction in CO2 emitted by the Vessel.  At lower speeds and light loaded conditions; greater fuel savings can be achieved and a greater reduction in CO2 emissions.On days with reduced numbers of crossings it will be possible to operate on batteries only for some crossings.In port the vessel is capable of operating on batteries only, zero emissions  ......Overnight Charging:  Power Supply Ė 400V, 3ph, 50Hz, 125A  Advantage of cheaper over night tariff  No plans to charge during the operation day  From renewable source  10 -13 hour overnight charging window  Automatic plug in system under investigation
   
 
https://cmassets.co.uk/wp-content/uploads/2015/11/CMAL_HybridFerriesPresenatation_040512.pdf


Title: Re: Community Hydro
Post by: Fintray on January 14, 2021, 03:11:55 PM
Hallaig, the ferry, cant be easy to charge 750kwh from a 50kw supply overnight. How long is night up there. ???
Ken

About all day at the moment  whistle


Title: Re: Community Hydro
Post by: JohnS on January 14, 2021, 04:49:16 PM
I would have thought that there would be a case for the ferry having an onshore battery that is continually being charged so that it can be used to charge the onboard battery during turnarounds.  I believe this is the procedure for the Helsingor - Helsingborg ferry between Denmark and Sweden.

Regarding the community hydro project, the big uncertainty is how much other green energy is produced on Skye and how much of it is curtailed due to the maximum export limit for the Isle.  Also, once the export limit is increased, which generators will rank highest in being allowed to use it?

It also looks to me as though there is none or minimal water storage in the catchment areas and therefore when production is curtailed, the water resource is 'wasted'.  Unlike with a dam where the resource is kept for later use.


Title: Re: Community Hydro
Post by: camillitech on January 14, 2021, 07:35:50 PM
Hallaig, the ferry, cant be easy to charge 750kwh from a 50kw supply overnight. How long is night up there. ???
Ken

But it is a 137kW supply  ;)


Title: Re: Community Hydro
Post by: camillitech on January 14, 2021, 07:44:37 PM
Hallaig, the ferry, cant be easy to charge 750kwh from a 50kw supply overnight. How long is night up there. ???
Ken

But why limited to 50KW?  The Hydro is lmited to 137KW and therefore the charge could be 137+50 = 187KW (Ok assumes no one on the island uses any other electric),  so only needs about 4hrs  ;D

Aye, Hallaig is capable of accepting a 250A supply but current input is limited to 125A meaning we can fully charge in around 10h. So I guess anything over 100kW would suffice.


Title: Re: Community Hydro
Post by: camillitech on January 14, 2021, 07:53:52 PM
I would have thought that there would be a case for the ferry having an onshore battery that is continually being charged so that it can be used to charge the onboard battery during turnarounds.  I believe this is the procedure for the Helsingor - Helsingborg ferry between Denmark and Sweden.



Aye John, I have suggested something similar ( having a large battery bank ashore ) in the past as a means of improving resilience to our frequent power cuts and surges which play havoc with the electronics, despite isolation transformers and multiple UPS systems. Even the main batteries are utilized as a 'shore UPS' in the event of grid failure above 30% SOC. Sadly ruled out on grounds of cost and we do not have a long enough 'turn around' to charge between sailings ::)