Just chiming in: I have had some luck over the years calibrating my
solar sensor and having it track pretty close to the curve generated to
predict what the maximum should be.
Then I noticed that while most of the time it is within a tiny bit of
the displayed readings and the predicted curve, sometimes it goes nuts
and exceeds the value by a 5% or so.
It never happens on a clear day. It often happens when clouds are
passing over. It never happens when truly cloudy.
I have received the same advice and conclude it is NOT any gremlin nor a
reflection (which I thought of as an initial possibility) but due to the
cloud edge effect.
Now I just take it as part of the function, and on perfectly sunny
cloudless days enjoy the sensor output tracking predicted values.
Dale
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