In article ,
"the_constructor" writes:
House fitted with 4KW of solar panels

In brilliant sunshine, such as we have had over the past couple of days,
what prevents solar panels producing the full permitted 4KW. Down to 2KW
now.

A few days earlier, when not as hot, solar panels were producing 3.73KW.

Angle of the sun (time of day).

Dust on the panels (my car seems to have a thick layer of yellow
pollen or sand which has built up over a few hot days of non-use).

Of course, there's also the possibility of a fault.

Also, it's light, not heat, which generates electricity.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]