At my lattitude the winter sun is barely over the southern horizon. To be at 90 degrees to the incoming sunlight my panels are mounted almost vertical on my south-facing wall. The ground slopes away from my south-facing wall. So the sun hits the slope to the south of my house and is reflected up onto my solar panels (tubes).
In a location where panels have to be mounted on the roof it would be much more difficult to refect additional light onto them.
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