I imagine there are two assumptions:
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Such a “balcony” system isn’t going to be 600 watts. I’ve got a pair of 100 watt panels that together would each make a fairly good awning for any of my windows. I also have a 200 watt Anker brand panel (one of those weird ones that feels like it’s made of a quarter inch thick sheet of denim) that’s the size of a beach towel. 6 of those 100 watt panels would come close to the size of queen-size bed. You’re not going to have many apartment dwellers dangling something that big out the window.
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Most people most of the time don’t have circuits loaded to the very edge of the envelope. If you plugged it into a circuit that’s drawing 10 amps…it’ll still draw 10 amps. It’s just that ~8.2 of them are coming through the breaker, the other ~1.8 are being provided by the solar panel.
It does still sketch me out a little because it breaks certain fundamental design rules of the power grid. Power should come from female sockets not male plugs, and it should come from before a breaker, not after.
This isn’t how I’m doing my personal solar power.
I would agree. Hence why I said “This isn’t how I’m doing my personal solar power.”
Apparently American units are coming with an outlet you install in place of a standard outlet which does monitor the combined power, so the building will have to be modified slightly. Still…any more than a couple hundred watts, if you can, have a proper system installed.