Solar panels that cannot be connected to the grid don’t have to be declared, but it is based on ability, not intention. So a solar panel so far away from civilization that you physically couldn’t connect it is fine, but if it’s at your house and you could connect it, then you have to register it. (Registration is a 5min online form though, it’s very hassle-free for a system that the German Government came up with lol)
Solar panels that cannot be connected to the grid don’t have to be declared, but it is based on ability, not intention. So a solar panel so far away from civilization that you physically couldn’t connect it is fine, but if it’s at your house and you could connect it, then you have to register it. (Registration is a 5min online form though, it’s very hassle-free for a system that the German Government came up with lol)