“1.5 million Germans” can’t be wrong?

You’re right. The number of Germans being wrong is vastly higher.

When it comes to renewable energy, I mean.

‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off – Balcony solar panels can save 30% on a typical household’s electricity bill and, with vertical surface area in cities larger than roof space, the appeal is clear.