On Nov 8, 6:57*pm, The Natural Philosopher
wrote:
harry wrote:
On Nov 8, 4:48 pm, Mark wrote:
On Tue, 08 Nov 2011 16:03:47 +0000, Roger Chapman

wrote:
On 08/11/2011 15:50, Mark wrote:
I wonder how many KW £30,000 buys?
*about 300,000
*Is that W or KW?
Kwh
Over what period? *(I want to know the power output)
Your original question related to a school spending £30,000. I don't
know the answer for sure but if £15,000 was the benchmark for a 4Kw
array then I think it reasonable to assume the school got a 10,000 Kw
array for their money. There must be some economy of scale for the
bigger set-up but FIT wise it wouldn't make sense to exceed 10 Kw by a
small margin as that would give a lower FIT. (But rules may have been
different for schools).
10 or 10,000 KW? *If £15K pays for 4KW then I assume that they won't
get 10,000KW for £30K ;-)

What I would like to know is whether a 4 Kw array is ever going to
produce 4 Kw or will the practical maximum always be a rather lower
figure. If Harry has been watching his meter assiduously he should be
able to tell us.
10-50% I'd assume.
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A 4Kwp array can in fact generate more than 4Kw on cold and sunny
days. (They are more efficient when cold).
The limiting factor is the grid tie inverter which manipulates the
output of the panels for max output, but won't let them go above it's
designed maximum.
On virtually any Summer sunny day they will hit max for a period of a
few hours. *The output is very like half a sine wave from dawn to dusk
if there are no clouds. *On exceptional days you can see the top of
the wave is "clipped" by the inverter. *(The panel on mine draws a
graph every day.)

Yes I do read the meter every day.

KWh max/day was just under 30. * * (May)
Kwh max/day *recent, was 15 * * sunny all day. *(Last week)
Kwh/day min was yesterday 0.2 * *Foggy/rain all day.

welcome to the winter.

When 0.2 a day is par for the course.
I remember you saying someth8ing to te effect 'teh clouds dont make any
difference: its the light that counts.

I have never said that. Your dementia troubling you again?
Once again being selective with facts.
One of the characteristics of a half wit.