2012-06-01, The efficiency of the paenls peaks in the spring and autumn owing to the temperature effect quoted in the report efficiency falling off with increased temperature but there is another contributory factor. Taking a value of 52.5 degrees latitude as a middle England example (apologies to the Scottish partners)then the sun's height above the horizon would be 61deg summer solstice, 14deg winter solstice and 37.5deg spring/autumn equinox. Perpendicular incidence on the paenls would occur at a panel angle with the horizontal of 90-61deg in summer (29deg), 90-14deg in winter (76deg) and 90-37.5deg (52.5deg) in spring and autumn. With the typical(?) angle to the horizontal of paenls on roofs around 45deg this would mean that the angle of the incident rays would be nearer optimal in late spring and early autumn. I believe that this would also contribute to the higher efficiency at these times. What do others think?

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2013-01-02, ça marche ou pas? does it work?

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