The chart you linked to shows wind at 45GW in 2015 and solar at 41GW in 2016, and this page [1] shows net generated energy in 2016 at 77TWh for wind and 37.5TWh for solar. Are you sure you weren't looking at the "New installed capacity" for wind and comparing it to the total capacity for solar? (The solar numbers are admittedly bigger than I expected to see, though it appears that wind is growing 4x faster than solar, which is the opposite from the U.S, where the installed wind base in greater but solar is growing 2x faster.)
[1] https://en.wikipedia.org/wiki/Renewable_energy_in_Germany