50 KW solar PV

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50 KW solar PV

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50 KW solar PV

Postby BigG » Wed Mar 19, 2014 5:30 pm

Finally got this project started after years of red tape!!
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Re: 50 KW solar PV

Postby Mark » Thu Mar 20, 2014 5:07 am

Nice big garden you've got !
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Re: 50 KW solar PV

Postby BigG » Thu Mar 20, 2014 8:52 am

You want to see the lawn mower, it has 4 legs! :laughing-rolling:
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Re: 50 KW solar PV

Postby Paul » Tue Mar 25, 2014 10:12 pm

Hi BigG

Do you get a FiT tariff payment or the equivalent (as I'm not too sure which part of Ireland you live in) etc? if so which rate (as they change all the time!)?

I'm sorry to ask so many questions, but with the Local Authority I work for we are doing similar things albeit mainly on buildings so far (roof arrays) that's in addition to Biomass etc. etc..

As I'm involved with our Carbon Management Plan, I am also interested in what individuals are doing as compared to organisations as well :D
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Re: 50 KW solar PV

Postby BigG » Wed Mar 26, 2014 11:30 pm

Hi Paul, I live in N Ireland ( a part of the UK) but we get payments via ROCS (Renewable obligation certificate scheme) which comes out at approx. 17p per unit generated and 6p per unit fed into the grid. What type of solar have you been involved in?
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Re: 50 KW solar PV

Postby Paul » Thu Mar 27, 2014 6:43 pm

BigG wrote:Hi Paul, I live in N Ireland ( a part of the UK) but we get payments via ROCS (Renewable obligation certificate scheme) which comes out at approx. 17p per unit generated and 6p per unit fed into the grid. What type of solar have you been involved in?

Hi BigG,

They've only been very small roof mounted ones on schools so far though more are planned .....!!!!!
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Re: 50 KW solar PV

Postby Paul » Thu Mar 27, 2014 10:17 pm

Hi BigG,

I think all the rates are changing again in the next couple of months and with non domestic they have to be installed and registered before a certain date, I'm not sure if this applies to domestic ones though.
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Re: 50 KW solar PV

Postby Paul » Fri Mar 28, 2014 8:38 pm

Hi BigG,

I'm not too sure if this will apply to you, but we commissioned some evaporative cooling units instead of air conditioning earlier this month.....

Amazingly our initial half hourly data backs up the original feasibility study in terms of kWh reduction, cost and CO2 savings and the pay back period of within 2 years ! :shock: :D :D
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Re: 50 KW solar PV

Postby Mark » Fri Mar 28, 2014 9:54 pm

What interest rate did you use to calculate the NPV ?
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Re: 50 KW solar PV

Postby Paul » Fri Mar 28, 2014 10:11 pm

Hi Mark,

I'm not too sure if that question is aimed at me or BigG :oops:

With ourselves we looked at pay back based on the current costs (though they will obviously increase - assumed at 5.8% as per the current Carbon Trust guidelines.....).

As the Pay back is 2 years or even less, then NPV was not too much of a consideration as the funds had already been ring fenced and some of it not used from previous years.

Certain organisations now use an "Invest 2 Save" criteria etc. :)
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Re: 50 KW solar PV

Postby Mark » Sat Mar 29, 2014 2:31 pm

It was aimed at you Paul. BigG hadn't talked about payback time, I don't think.

You have to factor in the interest rate to calculate a NPV in order to work out the payback time.

For anybody who is interested, NPV means net present value. In very simple terms, it calculates how much money is worth in the future. A very simplistic example. If you have a project that's costs £100 today, and will give a payback of £110 in 1 years time, you'd think that the profit is £10. However, if you factor in an interest rate of 5%, then your £100 today would be worth £105 in 1 year, so the true profit is only £5.
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Re: 50 KW solar PV

Postby Paul » Sat Mar 29, 2014 3:08 pm

Mark wrote:It was aimed at you Paul. BigG hadn't talked about payback time, I don't think.

You have to factor in the interest rate to calculate a NPV in order to work out the payback time.

For anybody who is interested, NPV means net present value. In very simple terms, it calculates how much money is worth in the future. A very simplistic example. If you have a project that's costs £100 today, and will give a payback of £110 in 1 years time, you'd think that the profit is £10. However, if you factor in an interest rate of 5%, then your £100 today would be worth £105 in 1 year, so the true profit is only £5.

Hi Mark,

Very well explained :D

I leave all that for finance to work out, as I'm more concerned about reducing and avoiding both costs and carbon emissions in my current role :)
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Re: 50 KW solar PV

Postby Mark » Sat Mar 29, 2014 3:49 pm

It does get quite complicated in real projects.......
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Re: 50 KW solar PV

Postby Paul » Sat Mar 29, 2014 3:59 pm

Mark wrote:It does get quite complicated in real projects.......

Yes I know, hence I just ask the finance people !

However, with interest rates being so low, yet utility costs rocketing the other way, perhaps you can understand why NPV is in the background and Invest 2 Save is more to the fore front..... At the moment! :)

Sorry for the Hijack BigG :oops: :oops: :oops:
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Re: 50 KW solar PV

Postby BigG » Sat Mar 29, 2014 8:31 pm

Not at all, interesting discussion.
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Re: 50 KW solar PV

Postby BigG » Sat Mar 29, 2014 8:33 pm

You also need to factor in inflation and energy cost increases
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Re: 50 KW solar PV

Postby Paul » Sat Mar 29, 2014 8:45 pm

Hi BigG,

That's what we do with the increases in utility prices and also take inflation into account also :)
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Re: 50 KW solar PV

Postby Paul » Sun Apr 20, 2014 2:07 pm

Hi BigG,

Have you managed to get it all installed and working yet? :)
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Re: 50 KW solar PV

Postby BigG » Sun Apr 20, 2014 6:09 pm

Hi Paul, the frame posts and ducting is all ready. The utility company have been very slow at doing the alterations (thier main sub contractor went bust causing all sorts of problems with grid connections). We are getting a three phase supply connected and three poles changed. It should all be up and running by the end if may , fingers crossed.
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Re: 50 KW solar PV

Postby Paul » Wed Apr 23, 2014 6:11 pm

Hi BigG,

On one of our admin buildings we've changed the air con units for the server rooms to evaporative units.

The initial results are amazing not only with reductions in CO2 but a 2 year payback as well. :D
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