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‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off
(www.theguardian.com)
This is a most excellent place for technology news and articles.
not very much, especially during the winter, the best way to optimize panel production is by pointing it towards the sun most effectively, the farther north, or south, of the equator the less effective it is, the less directly it points towards the sun in general, the less power you make.
It might still produce a decent amount of power overall, through a reasonable period of time, but it's probably WELL below what you could be making with an optimized install, especially one with solar tracking, granted some solar power is still better than no solar power, so you do get tradeoffs at the end of the day.
as another commenter said, there are solar power calculators out there, if you're looking for rough figures, use them.