Whilst the UK did indeed have 5 days with less than 2GW wind (not weeks with 0 like you claim), the situation is not as simple as news outlets and agenda-pushers would have you believe. A bunch of other plants (including nuclear) going offline was a major contributing factor.
So you propose to power all of Germany from the North Sea area? In theory it's possible, the North Sea is big enough. But transport costs maybe become an issue.
Also wind is the main renewable in western europe, not solar.
Having no wind for weeks basically doesn't happen, at least in the north sea.