Solar panels on 150 x 30 roof
- Thread starter focussed
- Start date
- Location
- Northumberland
Since the plumet in FIT probably not worth bothering, - Unless you can use all the power yourself, even then the economics will be marginal. Unless someone knows otherwise ?
Exfarmer
Member
- Location
- Bury St Edmunds
Forget it unless you need the power.
akaPABLO01
Member
Always install solar panels. Don't listen to these above.
Get yourself at least 3 quotes and start generating your own electricity
Get yourself at least 3 quotes and start generating your own electricity
attached is a guide to pv payback, it calculated on a live spread sheet but it cannot be uploaded due to virus implications.it can be altered to suit your own circumstances, with 29.9kw you get the generation tariff and due to you not needing a export meter it is assumed you will export 50% so you are paid extra for exporting 50% at the export rate even if you actually export very little
Can anyone recommend any companies? I know there are a lot of rip off companies out there
- Location
- Northumberland
He just said he did not need any power !
most of the fly by nights have gone out of the industry now, due to the low demand now the ones that are left will have been in the industry for quite a while, the tariff has came down a lot but so has the cost of an installation, we have installed about 200 systems mainly on farms in south west Scotland. the most common is steel frame building with cement fibre roof. and a few ground mounts.
Exfarmer
Member
- Location
- Bury St Edmunds
Unless you are a a heavy user of electricity there is not a hope in hell it will pay back.
you are wrong, it will pay for itself as long as the size of the array is correct for your energy usage, you do not want a massive array with low energy consumption, you do have to slightly change your usage habits of electricity in order to get the best out of it but it will pay itself off, the amount generated is not in dispute with a given size of array you "will" get a specified amount of electricity as long as the array is within 20 deg of south and a pitch of 36deg if poss, any deviation from these settings can be factored in to the program to give a more accurate figure for your location, climate data for your area is also factored in to the equation, 30 kw produces about 26000 kwh pa up here in Scotland, further south and you get more.
Exfarmer
Member
- Location
- Bury St Edmunds
F0ster your spreadsheet includes 4%general inflation .
10% energy inflation and zero maintenance costs
The reality in the last 3 years has been
1.5 % general inflation
- 20% energy inflation
Maintenance ?
It is always easy to justify spending when you invent costs and returns.
10% energy inflation and zero maintenance costs
The reality in the last 3 years has been
1.5 % general inflation
- 20% energy inflation
Maintenance ?
It is always easy to justify spending when you invent costs and returns.
akaPABLO01
Member
Couple grey areas in the spreadsheet
You should only do 2% inflation on electricity price and fit and export.
It's not rpi anymore, maybe over 12 months ago it changed to cpi. The good thing is both of these are increasing dramatically recently and should catch 2011 5% come brexit. But means life is more expensive.
http://www.bbc.co.uk/news/business-39337909
Factor in a minimum 10% of what you pay out for the system for maintenance and repair, you should achieve over production to compensate this. But still factor it in as over production should be used to cover downtime.
£27k ain't bad for a 30kW but the irradiance is probably more south then Kent. Probably central France of 1100 hours. Average north of Bristol South facing is about 850 hours. I see you've compensated 0.8 load which brings it back in line with a genuine 26,400kWh which is plausible.
Usage for 30kW being 80% throughout would be best suited on a site that probably uses over...75,000kWh at a guess, and that is daytime usage. Remember, summer you may peak at 10kWh draw whilst producing 30kW solar. By accreditation the maximum used can only be 50% and if memory serves me right, a new update dictates only factoring in 20/25% on a domestic property. I may be wrong.
I think that's it... oh, one last point!
Fit is only paid for 20 years not 25. You would need to knock off the export too as it would prove negative to sell the energy produced if you're using most of it plus the export license would make it non viable. Double edge sword.
That being said, there is no better return on your pound then generating your own heat and power, NOTHING, (maybe bricks and mortar, but as seen in 2007/8 you can lose a small fortune) invest and stick two fingers up to the rip off energy companies.
You should only do 2% inflation on electricity price and fit and export.
It's not rpi anymore, maybe over 12 months ago it changed to cpi. The good thing is both of these are increasing dramatically recently and should catch 2011 5% come brexit. But means life is more expensive.
http://www.bbc.co.uk/news/business-39337909
Factor in a minimum 10% of what you pay out for the system for maintenance and repair, you should achieve over production to compensate this. But still factor it in as over production should be used to cover downtime.
£27k ain't bad for a 30kW but the irradiance is probably more south then Kent. Probably central France of 1100 hours. Average north of Bristol South facing is about 850 hours. I see you've compensated 0.8 load which brings it back in line with a genuine 26,400kWh which is plausible.
Usage for 30kW being 80% throughout would be best suited on a site that probably uses over...75,000kWh at a guess, and that is daytime usage. Remember, summer you may peak at 10kWh draw whilst producing 30kW solar. By accreditation the maximum used can only be 50% and if memory serves me right, a new update dictates only factoring in 20/25% on a domestic property. I may be wrong.
I think that's it... oh, one last point!
Fit is only paid for 20 years not 25. You would need to knock off the export too as it would prove negative to sell the energy produced if you're using most of it plus the export license would make it non viable. Double edge sword.
That being said, there is no better return on your pound then generating your own heat and power, NOTHING, (maybe bricks and mortar, but as seen in 2007/8 you can lose a small fortune) invest and stick two fingers up to the rip off energy companies.
akaPABLO01
Member
I can help you do a study if you like then you'll have a good idea of what's involved, and what you can expect as accurate as you will get.
The measurements dictate a 50kW solar system, that's what you have to work with.
If it's cement then it's landscape, 8 down 25 across. This depends then on your purlins, you'll need 1 below ridge and 1 above gutter.
What's your supply like, do you have a db in the shed or how far to the nearest db? Is there a spare 3 phase to jack into? What amp incoming supply do you have on each phase?
Those questions will do for now.