This might be true about sheer number of installations, but by wattage most of the power comes from massive solar fields, not rooftop PV. According to Wikipedia [0], the five biggest installations are all in the Brandenburg area (a poorer region in the northeast), though anecdotally I see medium size fields all the time along the railways in Bavaria.
[0] https://en.wikipedia.org/wiki/Solar_power_in_Germany#Photovo...
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