"Tim Lamb" wrote in message
...
In message , Steve Walker
writes
On 10/09/2019 17:37, harry wrote:
On Tuesday, 10 September 2019 11:08:04 UTC+1, whisky-dave wrote:
On Monday, 9 September 2019 16:22:39 UTC+1, harry wrote:
On Monday, 9 September 2019 11:48:02 UTC+1, tony sayer wrote:
https://www.bbc.co.uk/news/uk-england-49566130
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None of these stories says how big the array is so it's hard to comment.
The picture looks like around 2Kw,
When they are installed the owner is provided with an assessment of expected
Kwh/year generated.

My first 4Kw array cost £14,000 and generates £2000/year so it's paid for itself
recently.
My newer array was £6000 but only generates £500/year.

why such a difference ?
If £14K gives you £2k per year = £7k = £1k per year
then why does £6k = £500 per year

has the sun become less bright over the last few years or is it global warming ?
The price paid/Kwh reduced as time went on.
I have near perfect orientation. Someone who hasn't might get a lot less.

So if the arrays are differnt what is this difference ?
Perfect orientation is pointing South, 36deg inclination plus no shading. (To
maximise power generated/year.)
Anything different reduces annual output.

Not necessarily.

https://www.telegraph.co.uk/news/ear...0996273/Most-s
olar-panels-are-facing-the-wrong-direction-say-scientists.html

My known mathematical limitations or Telegraph?

The optimum orientation for an individual panel is, as you say
36 deg (or whatever).

This is averaged out over a day, with peak ouput at mid-day
or at least when the distance between the panel and the
sun is shortest.( Something like that )

The point the article is making (I think) is that having all the
panels in a country (or whatever) producing their peak output at
exactly the same time is a bad ides as this requires more
battery capacity.

If the angle is altered on some panels so as to change the peak
output to a different time of day, although less efficient
overall, this will smooth out the supply slightly and so be less
costly in terms of storage.

The difficulty with this might be that it requires a degree
of co-ordination and co-operation between panel owners/ operators
with cross subsidy of owners/operators of less efficient
panels.

Although it's surprising that this has only cropped up now.

Or maybe the Telegraph reporter just chanced upon a German Web
Page from 15 years ago.


michael adams

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