Solar system for garage or house connection?

alternatively maybe use a house connection of the garage, so from another connection in the house via an intermediate meter? Definitely saves the house connection costs - I don't think one is allowed to recommend asking neighbors, because it's not permitted?!

Exactly, tap electricity from another house and bill it through your own meter. Or have the local electricity provider install a connection directly to the garage. The cables would likely run right in front of the garage on the public street land.

well, the own complete connection does cost quite a bit, both connection and monthly fees.