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Author Topic: Typical cost  (Read 209540 times)
itsnewtome
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« Reply #15 on: January 31, 2010, 01:29:54 PM »

I'm near Oxford so about 850kwh/year. But the 2 calculations seem to be based on different parameters i.e. 97% for being 3 degrees off south.
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AidyB
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« Reply #16 on: February 01, 2010, 12:19:15 AM »

Another point of discussion.
When the company gave me a quote they also gave an estimate for predicted  output.
It was under the heading SAP Calculation which was as follows
2880(wp of system) X 1.1 (solar radiation for my area(1100kwh/m2) x 97% (my roof is approx 3derees off os south = 3072kwh/ annum.
Having looked on the SAP 2005 document I believe the calc should be as follows
0.8 (each kwp produces 800kwh approx) x 2.88 x 1042 (solar radiation at 30 degree incline) = 2400kwh/ annum
None of the above take account of any shading.
This is a difference of over 25%.
Which is correct?

B is correct.  Under the MCS accreditation they HAVE to use the SAP figure, irrespective of what it'll actually produce, or if they do produce a differing figure they have to be very careful in their wording and show it in a lesser light than the SAP figure.  It's all very sensible, and your installer is being a little naughty.  However, if you don't then hit that target you can probably take legal action, so it's not all bad.  £240 a year difference as well under the FiT!
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Declaration of interest: I used to work for a Solar PV Installer.
mpooley
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« Reply #17 on: February 13, 2010, 12:40:59 PM »

I have just had a "rough" quote of £5000 - £5500 per KWP for a 6KWP system installed without any Grant as I will be try to get a Feed in Tarriff -

judging from this discussion this is sounding a bit dear?
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Moxi
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« Reply #18 on: February 13, 2010, 03:31:22 PM »

mpooley

That does sound expensive, are there any special requirements regards your install ie scaffold more specialised?, a number of roofs to cover?  also what panels and inverter have been quoted? and finally 6kWp is over the level stipulated for FITs which is 5kWp (Ted is this still the case or has that item changed?)

Installed kit has been coming in at around 3.90 to 4.50 per Wp so unless you have anything thats driving the cost up as a more complex install you'll need to shop around.

Moxi
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Ted
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« Reply #19 on: February 13, 2010, 06:15:34 PM »

Not sure which FITs limit you are thinking of. The PV rates are banded at 4kW, 10kW and 100kW so a 6kW system will be paid at the 36.1p rate.  FITs applies to systems upto 5MW.
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mpooley
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« Reply #20 on: February 15, 2010, 12:44:59 AM »

mpooley

That does sound expensive, are there any special requirements regards your install ie scaffold more specialised?, a number of roofs to cover?  also what panels and inverter have been quoted? and finally 6kWp is over the level stipulated for FITs which is 5kWp (Ted is this still the case or has that item changed?)

Installed kit has been coming in at around 3.90 to 4.50 per Wp so unless you have anything thats driving the cost up as a more complex install you'll need to shop around.

Moxi


Thanks
as it happens I think it will be an easy installation. I will shop around. Are there any recomended installers?

mike
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It's not easy having a good time. Even smiling makes my face ache.

“Science is the belief in the ignorance of experts.” Richard Feynman
Moxi
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« Reply #21 on: February 15, 2010, 08:17:05 AM »

Roughly where are you in the UK?

I think there are installers of PV on the forum, if you are in their area I expect they'll get in touch, otherwise there is a section on the forum where you can request installers to contact you, its traditionally been for solar hot water and the like but I would think PV installers would read it also.

I know Navitron now stock MCS accredited equipment but not sure if they have any installers, could anyone advise?

Moxi
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mpooley
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« Reply #22 on: February 15, 2010, 11:00:19 AM »

Roughly where are you in the UK?

I think there are installers of PV on the forum, if you are in their area I expect they'll get in touch, otherwise there is a section on the forum where you can request installers to contact you, its traditionally been for solar hot water and the like but I would think PV installers would read it also.

I know Navitron now stock MCS accredited equipment but not sure if they have any installers, could anyone advise?

Moxi

thanks

I'm in Norfolk
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It's not easy having a good time. Even smiling makes my face ache.

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Solar Sam
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« Reply #23 on: February 21, 2010, 06:20:23 PM »

For a 3.8kWp grid tied and ground mounted system you are looking at £15,000+VAT at 5%.





I forgot to add these systems use 240W mono-crystalline modules which are 14.6% efficient, not the cheaper less efficient poly-crystalline type.

« Last Edit: February 23, 2010, 09:07:14 PM by Solar Sam » Logged
chorisia
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« Reply #24 on: February 23, 2010, 12:38:56 PM »

I have been in contact with several installers near me in suffolk and national. The best I have been offered is £10000 for a just over 2Kw set up + vat at 5% and scaffolding £500 comes to £11000,most others have qouted £11500 all in price. The most rediculous price I had was from a national company who used typical double glazing sales pitch, £14800,...that was their discount price...and their name includes 'affordable'! My problem is my house is victorian and installers advise its my problem to work out if the roof can take the weight....building engineers are expensive. I am waiting for my local library to provide me with Structural engineers Pocket Book by Fiona Cobb...I hope I can understand it. I think it should be for the installer to at least offer a basic calculation as well as the wind loading calculation they do,if PV systems go on old roofs that cant take the weight it will soon put people with old houses of and its this old housing stock that needs to be made as energy efficient as possible. I have all the measurements of my roof if someone feels like helping with the calculation Smiley......ground installation not an option....
I have decided reluctantly not to proceed, paying building control over £300 who will want an engineers calculation another £300....for an 'anybodies guess' answere wont do, given the cost if something adverse develops after installation its my problem so its back to insulation, insulation,insulation... I can do a lot with £11000!
« Last Edit: February 24, 2010, 08:20:55 PM by chorisia » Logged
Solar Sam
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« Reply #25 on: February 23, 2010, 12:43:30 PM »

I have been in contact with several installers near me in suffolk and national. The best I have been offered is £10000 for a just over 2Kw set up + vat at 5% and scaffolding £500 comes to £11000,most others have qouted £11500 all in price. The most rediculous price I had was from a national company who used typical double glazing sales pitch, £14800,...that was their discount price...and their name includes 'affordable'! My problem is my house is victorian and installers advise its my problem to work out if the roof can take the weight....building engineers are expensive. I am waiting for my local library to provide me with Structural engineers Pocket Book by Fiona Cobb...I hope I can understand it. I think it should be for the installer to at least offer a basic calculation as well as the wind loading calculation they do,if PV systems go on old roofs that cant take the weight it will soon put people with old houses of and its this old housing stock that needs to be made as energy efficient as possible. I have all the measurements of my roof if someone feels like helping with the calculation Smiley

Is a ground mounted array out of the question? I must say I also shy away from old roofs  Embarrassed
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murraymint
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« Reply #26 on: February 23, 2010, 12:48:59 PM »

Would a 1950's roof fall under the term "old"?
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Kombi
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« Reply #27 on: February 23, 2010, 07:02:24 PM »

I was quoted about £12000 all in, and after grant, for a 3.96kW system installed by MCS installer. This works about £3/Wp.
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Brandon
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« Reply #28 on: February 23, 2010, 09:44:30 PM »

Would a 1950's roof fall under the term "old"?

According to the calcs, your 50's roof will most likely fail under it's own weight, let alone allowing for snow load or wind loading.

This could be a stumbling block for in-numerous older roofs.  I have had a few chats with our local BC about his, and they agree that a 60 year old roof that is still as straight as the day it was put on, (despite modern theory saying that it will collapse, ) is clearly a good roof, but then what will / may happen when it is loaded is anyones guess!!
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Simon
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« Reply #29 on: March 19, 2010, 04:35:50 PM »

Rather late response but my 1.35kWP system cost £4/kWp after receipt of £2500 grant which equates to £5.89/kWp if I exclude the grant which is no longer available. Judging by the other posts, this is on the expensive side but I had 3 quotes plus 2 refusals to quote and this was the cheapest (just). I supplied the scaffolding which had been estimated at about £400 as I had my own tower. It took one man 3.5 days working 9-6 or 7 with a small amount of assistance from me when the panels were lifted to the top of the scaffolding.

There is a shortage of MCS approved installers in Pembrokeshire and most people were adding quite a bit for travel.

Incidentally my roof was rebuilt in 1969 I believe but the rafters are 4x2 at 30 inch spacing in old money. I don't know what the Building Regs say but they looked a bit lightweight to me and the installer so he bolted doublers to the 3 load bearing rafters.

Anyway pleased with the job and now waiting for loads of sunshine  Grin

Simon
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20 tube Navitron Solar HW, 2.16kWp Solar PV, 7kW wood burner and insulation up to the ears, "Dolnet", Llanycefn, Pembrokeshire
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