[mduerksen]

Its definitely worth it to use all available space.

Still, it definitely cannot generate enough to bring you through the german winter. Some example numbers I have read: A 10kWp solar system that generates up to 1,400 kWh in a summer month will only provide about 200 kWh in December.

[ZeroGravitas]

You can get more power in summer by using a vertical bifacial panel positioned E-W.

And if you position it N-S you'll get slightly less power than a standard setup, but it'll be less concentrated in the summer, and also spread through the day more.

https://www.sciencedirect.com/science/article/pii/S266695522...

[mcbishop]

Holy cow, seven times more energy in summer months. Hydrogen storage sounds compelling in that situation.