Who pays for the larger meter cabinet? Who pays the electrician for his work? Who pays the rental costs of the meter? So it’s not completely free.
Apart from that, there are almost everywhere in Germany such cheap electricity tariffs that the second meter usually isn’t worth it.
Who pays for the larger meter cabinet? - I think in new constructions you can safely choose a somewhat larger meter cabinet so you don’t have to replace the meter cabinet later. So it didn’t cost EXTRA because I would have taken the large one anyway.
Who pays the electrician for his work? - he had to connect the compressor anyway. Whether to one meter or the other didn’t cost EXTRA.
Who pays the rental costs of the meter? So it’s not completely free. - connection of the meter and the rental are included in the basic price. And of course you include that when you consider if it’s worth it.
Apart from that, there are almost everywhere in Germany such cheap electricity tariffs that the second meter usually isn’t worth it. - I said nothing different.