grey box
Measures to reduce fuel bills ROI*
water tank insulation energy saving Lagging 1
loft insulation energy saving Loft Insulation 2
cavity wall insulation energy saving Cavity Wall Insulation 2.3
underfloor insulation energy saving Underfloor Insulation 4.4
solid wall insulation energy saving Solid Wall Insulation 15.8
solar energy energy saving Solar Hot Water 35
double glazing energy saving Double Glazing 58.1

*ROI is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house. The table assumes no government incentive schemes are used.

Renewable Energy Measures ROI**
ground source heat pump Heat Pumps
- Replacing Electric
4 to 8
ground source heat pump Heat Pumps
- Replacing LPG
120 to 239
wind power Wind Power 13 to 52
solar PV Solar Photovoltaics 23 to 60

**ROI is the time it takes in years to return the investment in electricity savings. The table assumes no government incentive schemes are used.

Money
Saving
Tips
 Energy 
Savings 
Each Year
 Money
Savings
Each Year
 CO2
Savings
Each Year
 Comments
dishwasher energy saving tips Dishwashers
Read More
30kWh -
90kWh
£4.62 -
£13.86

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11.01kg -
33.03kg
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Run the machine full and less often

boil less water in kettle energy saving tips Boiling Water
Read More
82kWh -
164kWh
£12.628 -
£25.256

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30.09kg -
60.19kg
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Boil only what you need. Savings depend on how much tea you drink!

fridge freezer energy saving tips Fridge Freezers
Read More
50kWh -
400kWh
£7.7 -
£61.6

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18.35kg -
146.8kg
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Fridge maintenance. Savings depend on size, age and rating

dmoney saving tips tumble drying Tumble Dryers
Read More
90kWh -
350kWh
£13.86 -
£53.9

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33.03kg -
128.45kg
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Operate Less often, clean filters, part dry clothes?

differnce in cost of shallow or deep bath Baths
Read More
700kWh -
1400kWh
£30.1 -
£215.6

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147kg -
513.8kg
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Have shallower baths and consider how you heat water

change energy supplier to save money Change Supplier
Read More
0kWh -
0kWh
£0 -
£500

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0 -
0
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save money and have a beerSwitch! This is the single simplest way of saving money. This is equivalent to 100 pints of beer!

shower or power shower which is cheaper Shower of Power Shower
Read More
120kWh -
1100kWh
£18.48 -
£242

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25.2kg -
403.7kg
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Aviod immersion heated power showers

save money and energy with good loft insulation Install Loft Insulation
Read More
3000kWh -
3750kWh
£129 -
£161.25

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630kg -
787.5kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

save money and energy with good loft insulation Improve Loft Insulation
Read More
1000kWh -
1500kWh
£43 -
£64.5

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210kg -
315kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

This table is under construction there are more tips here.

Solar Photovoltaic’s (Without FITS)

solar pv economics
 Cost:  High
 ROI:  23 Years (No FIT)
 Skill:  Specialist
 Energy Saving:  Medium
 Priority:  Low
 CO2 Saving:  Medium
 How much this measure costs to install: Low : Medium : High
 ROI is the time it takes to return the investment in fuel savings for an average gas heated 3 bed semi-detached house and assumes no government incentive schemes are used: Years
 How easy this is to do: DIY-Easy : DIY-Skilled : Specialist
 How much energy will be saved with this measure: Low : Medium : High
 What priority should be attached to this measure, this is based on the cost and ease with which it can be achieve togeteher with the savings in money and energy: Low : Medium : High
 How much Carbon Dioxide emission will be saved with this measure: Low : Medium : High

The terms solar energy and solar power are often used to describe technologies which collect the energy of the sun and redistribute it for our use. These terms are however a little ambiguous. For example, solar energy effectively drives our whole planet, wind, wave and fossil fuels could ultimately be regarded as solar energy.

pv economics

For the purposes of this site our only concern is for solar energy that can be collected directly by our dwelling and used to, for example, heat water or to drive our electric devices. For this article only Solar Photovoltaic power generation is considered. Please follow the link to take a look at Solar hot water.

good investment solar PVNB Please note this article only relates to solar photovoltaic economics without the Feed-in Tariff government incentives. Please refer to the energy saving trust for the latest on The FITs scheme as they do make a significant difference making solar PV economically viable in the UK where the sun does not shine as brightly as Spain.

Solar Hot Water...

To collect solar energy a method is required to collect photons of light and to convert the energy in this light into another form of energy for storage or use.

In photovoltaic’s this energy is directly transferred into electrical energy using solar cells, the energy may then be stored in a battery, used immediately in your house or sold back to the grid.

If you are interested, all light is made up of photons, which might be best described as tiny little packets of energy. There is a whole range of different energies or “packet sizes” which if you put them all together from small to large would constitute the spectrum of light.
Is it worth it?

On the face of it, it should be quite straight forward to calculate how sensible an investment in photovoltaic power generation is likely to be. The number of variables is however extraordinary, here are the more important

  • How sunny is it where you live.
  • How dirty is your panal
  • The orientation of solar panel, (North, South, East, West).
  • The angle of the panel.
  • The size of the intended panel.
  • The efficiency of the solar cells.
  • Efficiency of the electrical systems, (invertors and power storage)
  • The cost of the installation.
  • The cost of mains electricity.
  • The value of government incentive schemes to encourage you to install them.

The first term that you generally come across when looking into solar modules is the term Kilowatt peak (kWp) or peak power. This value specifies the output power achieved by a Solar module under solar radiation under set standard test conditions. Standard test conditions use a solar radiation level of 1,000 watts per square meter (W/m2).

In solar cells the light photons are absorbed by transferring electrons in a semiconductor to higher energy levels. They are transferred to what is called the conduction band of the semiconductor, where they can flow through a circuit and provide electrical energy to your property. Semiconductor physics is a bit much for this site; there is a good wiki on the subject. http://en.wikipedia.org/wiki/Semiconductor.

As an old example, take an 8m2, 1kW peak system (1 kWp). This means that under test radiation conditions of 1000 W/m2 this panel is capable of producing a 1kW power output. A general consensus of suppliers indicates that such a unit should produce 750 kWh of electricity per year in the UK, if correctly oriented. (As physically smaller 1kW peak system would produce the same but would have more efficient solar cells.)

The tables below give an indication of how these values might be derived and considers different radiation level across the UK and the world and various panal efficiencies, but it is very rough. If you are interested there is also a solar radiation map of Europe at the bottom of the article. We also show how much carbon dioxide emission you are preventing by generating your own. * The figures calculated for useable energy include an efficiency factor for pre-photovotaic losses and system losses, this is approximately 25%

N.B. FITS and government incentives are not included in these calculation, they just change too often.
The approximate annual electricity generation potential per m2 of solar panal in various irradiation conditions with various panal efficiencies and corresponding CO2 emission reduction.
Solar panal efficiency Example Places 12% 14% 16% 18% 20% 22% 24% 26%
Useable energy with irradiation level 900 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Scotland - North 81 kWh/year £12.474 (29.7kg) 94.5 kWh/year £14.553 (34.7kg) 108 kWh/year £16.632 (39.6kg) 121.5 kWh/year £18.711 (44.6kg) 135 kWh/year £20.79 (49.5kg) 148.5 kWh/year £22.869 (54.5kg) 162 kWh/year £24.948 (59.5kg) 175.5 kWh/year £27.027 (64.4kg)
Useable energy with irradiation level 1000 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Scotland - South 90 kWh/year £13.86 (33kg) 105 kWh/year £16.17 (38.5kg) 120 kWh/year £18.48 (44kg) 135 kWh/year £20.79 (49.5kg) 150 kWh/year £23.1 (55.1kg) 165 kWh/year £25.41 (60.6kg) 180 kWh/year £27.72 (66.1kg) 195 kWh/year £30.03 (71.6kg)
Useable energy with irradiation level 1100 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) England - North, Germany 99 kWh/year £15.246 (36.3kg) 115.5 kWh/year £17.787 (42.4kg) 132 kWh/year £20.328 (48.4kg) 148.5 kWh/year £22.869 (54.5kg) 165 kWh/year £25.41 (60.6kg) 181.5 kWh/year £27.951 (66.6kg) 198 kWh/year £30.492 (72.7kg) 214.5 kWh/year £33.033 (78.7kg)
Useable energy with irradiation level 1200 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) England - South 108 kWh/year £16.632 (39.6kg) 126 kWh/year £19.404 (46.2kg) 144 kWh/year £22.176 (52.8kg) 162 kWh/year £24.948 (59.5kg) 180 kWh/year £27.72 (66.1kg) 198 kWh/year £30.492 (72.7kg) 216 kWh/year £33.264 (79.3kg) 234 kWh/year £36.036 (85.9kg)
Useable energy with irradiation level 1300 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Canada - South 117 kWh/year £18.018 (42.9kg) 136.5 kWh/year £21.021 (50.1kg) 156 kWh/year £24.024 (57.3kg) 175.5 kWh/year £27.027 (64.4kg) 195 kWh/year £30.03 (71.6kg) 214.5 kWh/year £33.033 (78.7kg) 234 kWh/year £36.036 (85.9kg) 253.5 kWh/year £39.039 (93kg)
Useable energy with irradiation level 1400 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) France 126 kWh/year £19.404 (46.2kg) 147 kWh/year £22.638 (53.9kg) 168 kWh/year £25.872 (61.7kg) 189 kWh/year £29.106 (69.4kg) 210 kWh/year £32.34 (77.1kg) 231 kWh/year £35.574 (84.8kg) 252 kWh/year £38.808 (92.5kg) 273 kWh/year £42.042 (100.2kg)
Useable energy with irradiation level 1500 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Italy 135 kWh/year £20.79 (49.5kg) 157.5 kWh/year £24.255 (57.8kg) 180 kWh/year £27.72 (66.1kg) 202.5 kWh/year £31.185 (74.3kg) 225 kWh/year £34.65 (82.6kg) 247.5 kWh/year £38.115 (90.8kg) 270 kWh/year £41.58 (99.1kg) 292.5 kWh/year £45.045 (107.3kg)
Useable energy with irradiation level 1600 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Australia - South 144 kWh/year £22.176 (52.8kg) 168 kWh/year £25.872 (61.7kg) 192 kWh/year £29.568 (70.5kg) 216 kWh/year £33.264 (79.3kg) 240 kWh/year £36.96 (88.1kg) 264 kWh/year £40.656 (96.9kg) 288 kWh/year £44.352 (105.7kg) 312 kWh/year £48.048 (114.5kg)
Useable energy with irradiation level 1700 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) USA - Florida 153 kWh/year £23.562 (56.2kg) 178.5 kWh/year £27.489 (65.5kg) 204 kWh/year £31.416 (74.9kg) 229.5 kWh/year £35.343 (84.2kg) 255 kWh/year £39.27 (93.6kg) 280.5 kWh/year £43.197 (102.9kg) 306 kWh/year £47.124 (112.3kg) 331.5 kWh/year £51.051 (121.7kg)
Useable energy with irradiation level 1800 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) India, Spain 162 kWh/year £24.948 (59.5kg) 189 kWh/year £29.106 (69.4kg) 216 kWh/year £33.264 (79.3kg) 243 kWh/year £37.422 (89.2kg) 270 kWh/year £41.58 (99.1kg) 297 kWh/year £45.738 (109kg) 324 kWh/year £49.896 (118.9kg) 351 kWh/year £54.054 (128.8kg)
Useable energy with irradiation level 1900 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Brazil - Pantanal 171 kWh/year £26.334 (62.8kg) 199.5 kWh/year £30.723 (73.2kg) 228 kWh/year £35.112 (83.7kg) 256.5 kWh/year £39.501 (94.1kg) 285 kWh/year £43.89 (104.6kg) 313.5 kWh/year £48.279 (115.1kg) 342 kWh/year £52.668 (125.5kg) 370.5 kWh/year £57.057 (136kg)
Useable energy with irradiation level 2000 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Australia - North, California, South Africa 180 kWh/year £27.72 (66.1kg) 210 kWh/year £32.34 (77.1kg) 240 kWh/year £36.96 (88.1kg) 270 kWh/year £41.58 (99.1kg) 300 kWh/year £46.2 (110.1kg) 330 kWh/year £50.82 (121.1kg) 360 kWh/year £55.44 (132.1kg) 390 kWh/year £60.06 (143.1kg)
Useable energy with irradiation level 2100 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Nigeria 189 kWh/year £29.106 (69.4kg) 220.5 kWh/year £33.957 (80.9kg) 252 kWh/year £38.808 (92.5kg) 283.5 kWh/year £43.659 (104kg) 315 kWh/year £48.51 (115.6kg) 346.5 kWh/year £53.361 (127.2kg) 378 kWh/year £58.212 (138.7kg) 409.5 kWh/year £63.063 (150.3kg)
Useable energy with irradiation level 2200 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Saudi Arabia 198 kWh/year £30.492 (72.7kg) 231 kWh/year £35.574 (84.8kg) 264 kWh/year £40.656 (96.9kg) 297 kWh/year £45.738 (109kg) 330 kWh/year £50.82 (121.1kg) 363 kWh/year £55.902 (133.2kg) 396 kWh/year £60.984 (145.3kg) 429 kWh/year £66.066 (157.4kg)
Useable energy with irradiation level 2300 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Peru - South 207 kWh/year £31.878 (76kg) 241.5 kWh/year £37.191 (88.6kg) 276 kWh/year £42.504 (101.3kg) 310.5 kWh/year £47.817 (114kg) 345 kWh/year £53.13 (126.6kg) 379.5 kWh/year £58.443 (139.3kg) 414 kWh/year £63.756 (151.9kg) 448.5 kWh/year £69.069 (164.6kg)
Useable energy with irradiation level 2400 kWh/m2/year) * Grid cost of equivalent energy (CO2 emission reduction) Sahara! 216 kWh/year £33.264 (79.3kg) 252 kWh/year £38.808 (92.5kg) 288 kWh/year £44.352 (105.7kg) 324 kWh/year £49.896 (118.9kg) 360 kWh/year £55.44 (132.1kg) 396 kWh/year £60.984 (145.3kg) 432 kWh/year £66.528 (158.5kg) 468 kWh/year £72.072 (171.8kg)

To determine if a system is financially viable in the Sunny UK it is instructive to use the installers own figures, however the installers do not generally state which part of the UK their figures are applicable to, probably Cornwall! So be wary.

good investmentThe calculations in this article so far do not allow for the Feed-In Tariff (FITs) incentive schemes for renewable energy systems in the UK. They show raw calculations based on the true cost of grid electricity which is being replaced by the renewable energy system. With the FIT's scheme you are essentially paid by the government via electricity companies much more than the electricity is worth, even if you are using what you have generated. With the Feed-In Tariff solar PV looks a lot better, use this website, Energy Savings Trust to get more details and to determine the current rules regulations and eligibility.

Some Useful Links:-

http://solargis.com/assets/graphic/free-map/GHI/Solargis-World-GHI-solar-resource-map-en.png
http://solargis.com/products/maps-and-gis-data/free/overview/
http://www.greenrhinoenergy.com/solar/technologies/pv_energy_yield.php

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0 # MrAndrew 2014-07-07 11:30
Has this site been updated in the last 5 years, as that's around the age of the prices and efficiency ratings you're using?

A 'typical' solar pv system outside London should cost no more than £1500 per kW for a 4kW install and £2000 per kW for the really small ones (1-2 kW) and if anyone outside London quotes more than that, they're robbing you blind (unless all materials used are top-of-the-range)

As for generation figures, MCS now require everyone to base their quotes on a specific set of data, which should ensure that you get exactly the same figures for proposed generation, no matter how many quotes you get, even though their figures are only around 70% accurate in some areas.
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0 # replyrdh 2014-07-07 16:04
Hi Andrew

Yes, last week, but a different section!

Is this an installed price you quote? or just for the parts, the table goes down to £3000 for installed. And the more you stick up there on the roof the cheaper it gets.

If this is an installed price please add some links to a reply, I cannot find them, I will then happily amend the data, lowest I have found is £2800.

As for efficiency this is irrelevant given the way the calculations work above since they use a surface area. As panels get more efficient manufacturers reduce the surface area and they remain as 1kWp. so 5 years ago a 1kWp system was 8m2 it is now smaller.

cheers

Richard
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0 # The stats look wrongJohn 2013-07-02 19:13
I have a 2.5kW system taking up 13.8m2 of roof space (HIT-H250E01 panels), it is south west facing and in Nottingham, so it is far from ideal. It generated 2.16MWh usable electricity in the 1st year, that is 45% higher than your best case scenario.

These people publish their figures month by month and are doing about 15% better than me based on system size:
solarphotovoltaicsinexeter.blo gspot.co.uk/

The price per KW is also wrong, a quick Google search for "4kW solar" indicates that the current price is about 33% of the price used in your calculations, as an example:
navitron.org.uk/.../...
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-1 # replyrdh 2013-07-13 18:13
Thanks very much for the comment, It is appreciated.
The Article uses a 1kWp system as an example. According to the article tables with a 2.5kWp system in Nottingham, you should generate approximately 792 x 2.5 = 1980kWh. not a million miles from your numbers. I would say there is also a +/-10% error in all of these figures. I'll make that clearer.
Also we do not quote a price anywhere instead we give examples of 'fictitious' systems which range from £3000 to £6000 installed price
Granted we should add a 4kWp system to the calcs, as the cost of these is proportionally lower. We will add this soonish.
Thanks
Richard
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0 # New FactsSam 2012-05-22 13:00
This might be the case previously but not any more. Presently, the cost of leading German brands at 0.8-1 Euro where as Chinese manufacturer gives at 0.8 USD per watt.

If further add-up for shipping, imports duties, VAT, cabling&inverte r and labour cost and all other can not be in extreme case more than 80% additional. Further adding margins at 20% it can not be more than double. i.e. German panels can not be more than 2 Euro and Chinese panel 1.6 USD per watt.

So for 1KW (i.e. 1000 watt) system can not cost more than 2000 Euro (1600 GBP) for German & 1600 USD (1000 GBP) for Chinese.

Further efficiency of inverter are in range of 95% to 99% depending on manufacture. In extreme case balance of systems (i.e. excluding panels) efficiency can not be less than 80% (and not 75% as highlighted)

The cost of storage (i.e. batteries) is very high, but not that high also, such that the cost of system can be 3 to 5 times above calculated cost (i.e. it make the cost of 1 KW system in the range of 5500 GBP). Further the use of storage is optional, depends on the applications and size/calculatio n varies significantly.

I also agree, FITS and subsidies are not sustainable solutions and need to be taken into considerations since it is nearly impossible for any government to sustain such freebies in present economic climate or in long run.

So ROI and payback period is definitely not in the range that has been highlighted over here. Further well balanced systems (irrespective of orientation) can be easily in the range of 5-7 years. Which is not bad, compare to YoY bank interests rate are in range for 7-9% for loan or 3-5% for fixed term deposits.
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0 # please be clearerRichard 2012-05-24 00:15
We are very interested in what you have to say be could you rephrase so that we can understand your points.A main cost is install labour, it is never a trivial expense, get a quote and find out for yourself, I can barely understand any of the rest of your commentcheersRi chard
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0 # Sunny!Colin 2012-02-28 17:39
its not about sun its about light, these panels work on cloudy days. Light hours is more important than 'is it sunny where you live?'
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0 # Sunny!Richard 2012-02-28 20:49
Yes Colin, if there are photons of the correct frequency impinging on a panal in the correct way they will be collected. however if a cloud is in the way of the sun there will be less photons to collect and therefore less electricity will be generated. True it is about light hours but also the intensity of the light hours.
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0 # Please updateAnne Thomas 2012-01-13 09:33
You will need to update this today in the light of the appeal, but your costs are very high. Prices have dropped significantly. The energy saving trust calculator is hopelessly wrong according to our real data for the north of Scotland, giving twice as long pay back time as we are actually likely to get. We got 3100kWh last year from a 3.5 kW system. This now costs about £10000.
Other discrepancies
1. Solar PV panels are more efficient when colder (20 degree optimum), so although there is less light they are more efficient in the north
2. The EST calculator takes no account of RPI (guaranteed for FITs) or energy price increases over 25 years. A bank would not be allowed to give such misleading figures.
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0 # re Please updateRichard 2012-01-13 09:59
Hi Anne
Can you send me some hard facts and a full study on this and I will be happy to do a full case study on this using this data, provided that it is verified and factual. How efficient do you say the cells are?
my data suggests a 3.5kWp system will provide 2268 kWh per year. so if the true number is 3100, based on more efficient cells and with the install cost is £10,000, then yes the article needs to be revised. I look forward to the data.
All the best
Richard
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0 # re please updateRichard 2012-01-13 21:50
pity about FITS!!!!

Have a look at this link

navitron.org.uk/.../...

Most seem to be quoting about 3 kWh per day on average for a 3ish kWp system. This is entirely consistent with the article above

Your daily average power gen is so much better than most of these. We find that the efficiency difference of solar cell with temperature across the UK is very small sub one percent, and at the very most light conversion efficiencies are 14% for a reasonably priced system.

Sincerely do you have some tips for others??

Also we cannot find an install cost as cheap as you suggest, nearest we can find is £16,000 for 3.5 kWp. But we agree they have come down in prices and we have added a new price to the article £5,500 for 1 kWp.

We keep being told the payback quoted here is too long, but no one provides any evidence. We like facts.
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0 # updatedRichard 2011-10-11 18:43
We have updated this article and included FITS data, at long last!
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-1 # Out of dateSeb 2011-10-11 10:20
This information is hopelessly out of date and misleading. Payback is typically 8-10 years.
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0 # Confused about out of dateRichard 2011-10-11 09:40
Hi Seb
please quantify what you are saying, are your comments based on solar technology or on the feed in tarriff scheme in the United Kingdom. The Feed in tarriff scheme does indeed provide a much better payback time and it probably is about 8-10 years as you say. But it is a market distortion and is likely to be tempory, it pays 5 times (about) the market rate for the green electricity. The article above is based only on the physics of solar cells, invertor efficiency, the sun, your geography installation cost and the standard electricity tarriff. In this context the only thing that can make the above out of date is much more efficient solar cells, from 12% efficient to over 50%. This has not happened.
all the best
Richard
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0 # FITSDaniel 2010-11-29 15:00
According to some, the new Feed-in-tariffs makes solar a bit more positive in terms of investment. Any chance of updating this page with FITS included in costings?
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0 # FITSRichard 2010-12-08 18:15
This is on the to do list and you are of course correct. I do wonder how long FITS (feed in tarriffs) will last however. So if I do an ROI calc it must assume the FITS endure. I bet they won't. Thoughts are very welcome
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