On Monday, 19 August 2019 20:03:05 UTC+1, Chris Green wrote:
I know only too well that a (for example) 250 watt solar panel doesn't
produce a continuous 250 watts for 24 hours a day every day of the
year. There's those things call nights, not to mention dull winter
days, and even dull summer days.

I've searched diligently but I can't find a site providing what seem
to be realistic 'ball park' figures for UK regions. I suspect there's
a special word for this percentage which I haven't found.

So, can someone either provide a figure for the average output of
(say) a 250 watt panel over the year in eastern England or point me at
a site that will tell me this. (I seem to remember the figure is
something like 20 to 25 percent, so I'll get an average of 60 watts or
so from a 250 watt panel).


On a perfect day, my 4Kw array can generate 30Kwh.

On a bad day in Winter 0.3Kwh.
It might only be running at 50w peak.
I 'spect if there was thick frozen on snow, I'd get nothing at all.