Hmmm, I wonder how this would affect things in the future where this is widely used.

I.E. if you had both widespread solar usage and some kind of large blackout, would it be hard to get all your solar back online because it's all in the "waiting for the grid" state? And the grid can't come back at capacity because all the solar it's expecting is out?

I assume people smarter than me have this figured out, but just a random thought if anyone knows more.

Assuming its not cheap piece of crap that isn't UL listed and that's where the problem is.

You also use 120VAC which makes the current overload issue a lot worse.

Voltage inside of residences is 120v AC, but its 240v thats delivered to each house. I think a bigger difference is that in the USA that 240v AC is single phase where I believe (Germany included) many nations in the EU are 3 phase.

The USA does have 3 phase power for most commercial applications though.

There are people in the Netherlands that have the system you describe. This is pretty rare though due to the massive push for new energy meters that's been going on for the last 10 years or so. And with good reason: lots of the old meters people had were pretty unsafe and unreliable. For most people, having automatic usage reports going to both them and the electricity provider far outweighs the downsides.

Most of us are in a similar situation as Germany. We have smart meters that allow you to provide power back to the grid and this is currently very profitable. However, from 2027 onwards they are (mostly) getting rid of the profits this brings the consumer, in order to make the grid more stable and also for other, less clear (most likely energy company and government spending related) reasons.

As someone who's worked in the grid provider field for a bit I'm not necessarily against this change; peak power surges due to lots of people selling of their excess solar power production is a huge problem that's making the energy transition that much more difficult. Even in local grids, we're starting to have to use massive power cables to be able to handle this. This brings with it a lot of extra costs and permit nonsense, making the life of the grid manager that much more difficult.

I wish people would take this upcoming deadline to start electrying more things in their house. But if my parents are anything to go by, all they'll do is complain about losing their golden goose that they've profited from for over 10 years. They could get an electric car instead of their nonsense plug-in hybrid, they could electrify their heating needs, they could install a home battery and so much more. I know it costs money to do so but you basically run all of it for free most of the year. And besides that, with all the current global issues that are going on the reliance on fossil fuels should be phased out rapidly.