I could only get a 2.5kw system on the roof.
It was NOT the cheapest by quite a long chalk.. £10k +
But.. Looking at the figures Deano has given I think I proly did the right thing.
It has been almost exactly two years since we had them fitted
The two summer payments each year have been between £550 and £650 and the winter ones £275 to £375
So an average return per year of about £1400 .. in cheques
Then of course there is, as mentioned, the considerably cheaper bills. Ours have dropped in excess of 1/3rd
While I agree with Rhumy, there will always be 'better news tomorrow'
I actually know a guy who wanted a computer back in the early 80's
There was always something better coming soon....
To this day he still has not got any sort of computer and still has no mobile fone for the same reason ( and he has a whole spare room full of computer mags !!! )
Make your decision, bite the bullet and just do it
As cost of installation goes down so will the feed in tariff ..
I expect to have mine fully paid for in about 7 to 8 years.. No idea if I will even live that long, but hey, we get the feed in tariff for 25 years so even when I pop me clogs woman will get it, and then one of the kids will get it..
And lets face it, power is not getting cheaper ( and the feed in tariff goes up each year too, so you get more and more as things change !! )