Roger Chapman wrote:
On 31/10/2011 19:46, John Rumm wrote:
On 31/10/2011 19:24, harry wrote:

Mind you, £0.21/Kwh would still give a better return than money in the
bank these days.
I wonder what percentage of the national load it provides on a sunny
day?
I have done 2747Kwh to date.

It hardly matters, it will need a proper power station sat there in hot
reserve anyway, so its real contribution is of little value.

Nonsense.

Unlike windmills the major contribution of PV panels is reducing demand
on the grid and with a multitude of individual houses any variation in
demand/output will be statistically easy to determine and any
variability will be small in relation to the other factors that the grid
has to take into account.

You really haven't a clue have you

The major contribution of *any* power station is reducing demand on the
grid to exactly zero, overall.

PV panels are just a massively expensive and inefficient and
uncontrollable way to do it.




I don't know what the exact proportion is but even windmills don't need
100% of hot reserve. PV panels shouldn't need very much (or even any)
even if every house in the land was so equipped.


At night PV panels need 100% reserve. They produce nothing. On a grey
day in winter they produce so near nothing as to be irrelevant,

They have in fact a worse variability than windmills. which seldom got
to nothing everywhere. PV does it every might,.