The moment I start getting charged for exporting solar, using infrastructure I paid for, is the moment I disconnect it from the grid.
Where to put it?
No where. I would turn the entire PV system off so it's not feeding excess back to the grid, and just run off batteries/grid alone.
I would rather the PV system be off, than be charged to use my own equipment. Unless of course they want to pay me back for part of the original cost.
Agreed. To be fair, and I don't know about your own case, but many such installations have been subsidised, so you got "paid" at some point already to have your installation (again, may not apply to you specifically).
The problem with this though is that money doesn't necessarily circulate in a fair way.
But other than just money, this is also a question of leading people on. They were told they would get money from the energy they would supply the grid, and for a while, they did. Then once there are enough people with solar installations, the deal starts to look much worse. In that, it's exactly like with any of the big tech companies, luring people in with attractive deals and once there are enough customers, and these are hooked, bam, they start changing the rules completely and start charging ludicrous amounts of money for the same service. They may justify it with plenty of relevant figures, but you can't help but feel scammed.
Technically, of course, sure the problem is all with the storage, but it's nothing new. Everybody knows that it's still an unsolved problem for the most part. One can just wish all professionals involved were honest about it to their customers, rather than lead them on constantly, just to get more users.
As a owner of such installation, all you can do is to try and focus most of your daily power consumption around peak solar hours. Yes, unfortunately, with typical modern life, it's often exactly the opposite, but there are still ways to optimize that, and yes, that's something you need to be responsible for when you start being a "producer" of electricity, rather than just a passive consumer.
And yes, as some have said, you can just turn it off entirely at peaks hours instead of feeding the grid and having to pay for it. Assuming that you actually can do that with the installation you got. But that is so obvious that if there are still lots of people angry, sure that may be because they are all stupid, but that may also mean that there's a little more to this tax than this. And well, tax creators are so, uh, creative, that I would also be extra wary of not being able to circumvent the tax as easily as it looks.