Solar Panels

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Re: Solar Panels

Postby Nick » Sun Oct 26, 2014 8:40 am

Hahaha :lol:

That wasn't what I meant. The document is a good document. Summarised, 60s & 70s bungalows have to be assessed seriously, but there shouldn't be an issue with other properties.

Properly accredited Solar Installers (see links above) will be able to self certify the installation, others need to get Building Control approval.
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Re: Solar Panels

Postby Jo King » Sun Oct 26, 2014 10:10 am

Nick wrote:Hahaha :lol:

That wasn't what I meant. The document is a good document. Summarised, 60s & 70s bungalows have to be assessed seriously, but there shouldn't be an issue with other properties.

Properly accredited Solar Installers (see links above) will be able to self certify the installation, others need to get Building Control approval.


Did you actually read the document?!!!

Unbelievable Nick - where do I begin?

1) it mentions many older roofs already being at the limit of their load and a structural engineer should be involved
2) it mentions the way the brackets should be fixed to the rafters - correct spacing, correct fixings etc - now let's take this example:-

We renovated a 1960's house, replacing the entire roof and finished with new concrete roof tiles. It was highly exposed on a hill, West facing looking across Dartmoor so all tiles had to be clipped. The way clipping is done, you cannot 'unclip' and 'reclip' - you have to remove the tiles right up to the ridge and start again. The entire roof was wrapped in TLX gold 30mm quilt and sealed at soffits to create a completely draft free seal and a warm roof.

We sold the house, the buyers immediately had solar panels installed on the roof by accredited installers. They did not remove the tiles to the ridge, they just broke the clips to put their brackets through, they pierced the TLX gold in numerous places.

Neither the buyers or the installers know what they had done.

I hoped you'd leave it so others considering these things on their roof would read the document, but by summarising the way you have is misleading and could cause people to make mistakes, so I felt impelled to comment further. It's your choice to put them on your roof, I don't care anymore because you're fully informed but please encourage others to read the document and not rely on your summary.
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Re: Solar Panels

Postby Jo King » Sun Oct 26, 2014 10:23 am

Victorian and 20th century roofs saw the widespread use of softwood construction. In the 1950s the Timber Development Association (TDA) produced standard pattern roof arrangements, comprising softwood principal trusses, purlins, binders etc.
Studies of these roofs have shown them to be near capacity at present, with the principal variable being the standard of timber used (quality, stress-grading, seasoning etc). Bungalow roofs, on estates constructed in the 1960s and 1970s,
tend to push these roof types to their limit, as spans increase.
Connections are critical in principal trusses, many of which have been found to comprise heavily corroded bolts, varying sizes of washer and inadequate projection of bolt threads. Internal members are often only connected by 2 no. nails!
Structural modelling of the addition of solar panels has indicated that bending stresses would approach 100% capacity and more. This erodes any factor of safety and presents the possibility of an ultimate failure condition (collapse). Member deflections in TDA roofs currently run at around 150% of that recommended for brittle finishes, i.e. plasterboard and plaster skim. Imposition of further dead load only exacerbates this.
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Re: Solar Panels

Postby Lynda » Sun Oct 26, 2014 11:40 am

Thank you all for your help and advice. I'm sure we've made the right decision not to proceed.
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Re: Solar Panels

Postby keith » Tue Mar 03, 2015 10:38 pm

Jan Average 5 KWH per Day february 7.5 KWH

Total from May last year to Date 2600 KWH, Had I been on FIT at 13P a Unit that would be £340 on an approximate cost of £4000 so 9 month £340 Approx 12 Month £450 so not a bad rate of return
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Re: Solar Panels

Postby Nick » Tue Mar 03, 2015 11:11 pm

I haven't looked at the culminative figures, but during the day typically we use 1Kw of which half comes from the solar panels.
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Re: Solar Panels

Postby Steve Griff » Wed Mar 04, 2015 9:27 pm

Nick wrote:I haven't looked at the culminative figures, but during the day typically we use 1Kw of which half comes from the solar panels.


Feck Nick, that's a lot of porn!
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Re: Solar Panels

Postby keith » Fri Mar 06, 2015 10:41 pm

1KW per day don't put kettle on often or toaster do we
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Re: Solar Panels

Postby keith » Fri Mar 06, 2015 10:42 pm

Talking to a friend last night who claims his system cost £4500 and is returning over £1000 a year
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Re: Solar Panels

Postby Nick » Sat Mar 07, 2015 11:39 am

keith wrote:1KW per day don't put kettle on often or toaster do we


Not while looking at the Optimersion display!
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Re: Solar Panels

Postby Nick » Sat Mar 07, 2015 11:44 am

keith wrote:Talking to a friend last night who claims his system cost £4500 and is returning over £1000 a year


I think that's plausible, but at the top end of achievable. I'm currently saving £1/day and being paid 50p/day from a system that cost £7k, but it's winter so it'll be dramatically better later in the year.
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Re: Solar Panels

Postby neevamerk » Thu Aug 22, 2019 7:34 am

This is really very helpful information, it will surely help me and thanks for telling those company traps.
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