On May 19, 2:54*pm, harry wrote:
On May 19, 2:06*pm, "
wrote:





On May 19, 8:45*am, Andy wrote:

On May 19, 1:20 am, harry wrote:

There is a number for your area. *In my case it is 830. *This is the
number of Kwh generated per year per kwp installed. You need to find
out what your number is, (prob. around 1000 fir you).

**** Thanks haarry. *A back of the napkin calculation says my
number is more like 1200 for Dallas *(1.0 x 5.5 X 365 X 64% ), but
I'd
need to look up the specific criteria used in your number to
see if I left anything out.

Thers additionally a chart that shows % reduction in output as the
array deviates from due South and from the optimum angle (to the
ground).
My optimum angle is 35 degrees, it will be more like 10 degrees in
Texas I should think.

**** I agree. * My latitude is about 36 deg N...... *and I don't
remember
the sun path deviation thru the year. ( I should, since celestial
nav was once a hobby, but that was a long time ago :)) *)

This is all for fixed arrays. *The cost of rotators is not generally
viable.

***** Perhaps some mechanical guy will come up with something
eventually. But, in Texas, we need to practically weld the panels
to the roof since we are subject to large hail, tornadoes, and , at
the very least, high winds.... I don't think you have those
environmental variables in the UK..... On the other hand, on my
trips to south England, I don't think I've ever seen the
sun * :))))))

The current technology is silocone but they are not all a like. Some
perform better in lower light conditions than others, ie in the
shoulder period. *So while they have the same Kwp, they generate more
Kw because they perform better during the shoulder periods.
Most power is generated between 10.00h and 14.00h.

*** I guess you are using GMT...... Ok, that is consistent with the
cosine function I was talking about, with "local noon" being 0 deg.
The panels I used were amorphous silicon, by UniSolar. *I recently
google them again, and they have some interesting new items, including
"solar shingles".... *They are just lain on top *of the normal
asphalt
shingle and a couple holes bored in the roof to bring two wires thru,
and the interconnection done in the attic...... It would be a bitch
to replace the roof shingles....

So you need to look at the graphs of power generated/available light.