I didn’t say anything about the former while the latter is uncertain as Germany already has a shit-ton of solar and other renewables power installed. The true benefit would be to store the energy for use when there is no sun - that would more likely reduce burning of the fossil fuel.

Your are mostly wrong. Infrastructure is still required because sun isn’t shining through night and short cloudy winter days. Also Germany has plenty of solar and other renewables power already, specially during day. So it could be that almost all the electricity during sunny days are already coming from renewables. This balcony thing is far from independence.

Probably doesn’t help the environment unless a battery is added, the bigger the better.