

I think you’re comparing apples to oranges.
The main selling point for a “Balkonkraftwerk” is that it’s cheap and doesn’t require an electrician to install.
That way they pay off rather quickly and result in a lower electricity bill when you look at a span of 10-15 Years.
Solar farms in Spain on the other hand require massive investments in Infrastructure and the farms themselves. Not to say they’re a bad idea, but it’s a very different thing.
The whole argument is that you need neither a loan or a professional installer for a Balkonkraftwerk. Your’re completely missing the point.