they must be all free solar...we've never sold silver framed on domestic roofs, they also look like poly panels ! The salesman(mcs installer) doesn't know much about shading.....
Would be interesting to see what happens to the grid voltage in a house on that street without panels as the sun goes in and out on a partly cloudy day.
This can be caused by the panels being bought at different times and / or not coming from the same production batch. If the glass / laminate changed specification or used a slightly different material it would show next to the others.
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