On May 24, 7:19*pm, "TMC" wrote:
Some one I know has been offered a solar panel deal

The information I have been given is that the panel installation would
normally cost 10k

At that rate it would pay for itself in ten years due to a combination of
electricity not paid for and inconme from the excess going into the grid
they say

They are offering the panels for 250ukp and say that they make their money
by taking the money from the excess going into the grid

My current electric bill is about 80ukp per month

How big would the panels need to be to generate in excess of this usage?

I cannot see how this could ever work so can some one please explain

Regards

You can't do this.
The reason being only accredited installers are allowed to do the
work.
You need a certificate to connect to the local grid and another one to
send to whoever you are selling your power to. Plus a copy of the
invoice.
Only accredited installers can give you these.

In practice tthe best size to go for is 4kw if you have room. This
gets the optimum price for your power. The next price band is 10Kw
but few people have a roof that big. (Barn roof size).

I have a 4Kw array, we do all our power using activities in the middle
of the day.
In Summer we can cut our electric by 80% but we are retired and able
to do this.
We have generated 630Kwh in 35 days. Best day 29 Kwh, worst day 6Kwh.
It will be a lot less in Winter.
I need to average 10Kwh/day over a year to get the projected money
back.