Gordon-Loomberah wrote:When adjusting the declination on my equatorial tracker today for the rapidly south heading sun, I had a close inspection of the 4 of my panels that are yellowing, and its definitely not the glass that is changing colour, it is the once white material that surrounds/backs/holds the cells in place, so I cant see that it will cause any reduction in output, in the short or long term. IE it's not a problem at all.
Gordon-Loomberah wrote:Different brand panels... that might be relevant, has he always produced more, or has your production gone down relative to his? There is no reason at all for the glass to become more opaque, so it would be the backing that is going yellow, like mine I suspect. If the glass did have more Iron, then it would be greenish to start with, and wouldnt be changing. There is plenty of Fe in house window glass, and it doesn't change colour.
How about shading, do you have any at all during the day, and any time of the year?
Gordon-Loomberah wrote:If you were both able to accurately log your output, it would be much easier to figure out why there is a difference, but I'm certain it isn't due to the yellowing substrate.
Are you sure you have exactly the same total panel rating? A "1kW" system might have anything from just under 1000W to 1200W.
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