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Not the one you are replying to but I was thinking about what is now popular in Europe: instead of big solar farm, it's more € 4 000 system with a bit more than a 1.5 KW of balcony solar, and a small 3 or 4 kw battery inside the home associated with a smart meter that doesn't allow the current to flow back to the grid. It cannot allow for off-the-grid living but it does keep the grid safe and decentralizes energy generation. With the possibility of a call to share in case there is a catastrophic event.
...and...
Those do the opposite actually. Those are some of the small scale versions of the problem that @ms_lane@lemmy.world was referring to.
Those are "grid following" devices. So where they can contribute to a cascade failure is if there is a slight sag in the grid voltage or frequency (supplied by the "big spinny things" of utility grade generators that poster was referring to), the solar system would turn itself off to protect itself. This would enable full passthrough of your households electrical demand to pull from the grid directly instead. Where the balcony solar would be offsetting a nice chunk of demand, suddenly that demand is pulled from the grid instead in a fraction of a second. Now imagine ALL the houses doing that at once. The sudden spike in demand from all those households can cause utility grade solar/wind operators to pull their supply as well, further spiking the need for more electricity at that moment. Then you get brownouts or blackouts because the only supply of electricity was the grid scale generator with the big spinny generators (which form the grid), and the demand is beyond the ability of the generator to supply. So breakers are thrown cutting off electricity customers to protect the electrical infrastructure.
Because balcony solar are "grid following", they cannot be called on to share in the case of a catastrophic event. They need a healthy grid in place before they can come online.
This point is true though during the good times. Any reduction in grid demand (which these balcony solar setups do) is a net positive. However, they don't help in catastrophic situations because they depend on the grid being up and healthy. I wish more of the world allowed them. We aren't allowed to do that in the USA, as an example. Putting up any amount of solar that connects to the grid at all, even solar that doesn't feed power back (called "zero export" here) require detailed engineering plans and permits before you can install them. This increases the cost and complexity for any residential solar installation.
The thing is, I've been eyeing those solar+battery systems to save up a bit but I really don't want to be part of the problem with grid failures.
No it's good for the energy transition of you get solar+battery, especially if you're in France. Sellers of these systems often promise you a return on investment based on historical data. Be aware though that due to the energy transition business cases can quickly develop unexpectedly. You're taking on risk.