On Apr 22, 3:50*am, Bob Minchin
wrote:
Andy Dingley wrote:
On Apr 21, 10:30 am, Bob Minchin
*wrote:

If I arrange to consume or in some way store that energy that I would
otherwise pay 11-12p per kWh for, it can be worth 45p to £1.25 per day.

Let's say a quid a day, because it's easier.

So how much did it cost? Any thoughts on the breakeven point?

Andy
If you are considering the breakeven point, then the incentive payments
dominate. So in addition to your rounded "quid a day" add a further 4
quid in incentives and exported power payments.
Then index link that at RPI ( the uplift used recently was 4.8%)
However, in practice it is quite difficult to manage domestic
consumption to follow the time profile of the sun's availability so
treat the "quid a day" as a bonus and just use the 4 quid a day

Lets say useful output for 200 days a year (a guess as I have no data yet)
So a minimum return of £800 per annum indexed and tax free.
Capital cost £8500 paid from savings that was otherwise earning 3/5ths
of f'all in the building society (taxed at 40% to boot)

Too many unknowns (RPI and electricity price inflation vs building
society interest rates) to work out a payback period but it should be
paid for in 10 years and the scheme contract runs for 25 years.

hth

Bob

There is a map of numbers.The numbers indicate the Kwh you will
generate per year for every Kw of installed PV array.
In the UK it ranges from 750 to 870. Obviously the jocks and taffs
have it worst.
You need to get the map and see what the number is where you live.
These numbers are average as of course the climate varies.
My number is 850. I have a 4 Kw array. So I should generate 3400 Kwh
worth about £1650 if all is taken into account.
My array cost £14,000 so the return should be 11.8%. Where else can
you get that tax free, inflation linked for 25 years?