this post was submitted on 12 Mar 2026
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I mean, it makes sense to me that consumers can't be pumping energy into the grid with no way to cut it off, but I'm not a lineman or some sort of civil engineer or whatever.
But if I were a lawmaker, I'd be on the phone with the Germans, who have 1.2M of these connected, and figuring out if and how they're doing it safely. But lawmakers seem to be somehow incapable of reaching out to people who know fuck all about anything.
It is more than just the concern around back-feeding the grid. These simple balcony setups connect to your home grid via a single outlet. Most US outlets/circuits are 15 AMP or roughly 1500 watts max capacity. These single circuits can only carry that much current total at any one time so if you have it loaded up with incoming power AND use anything else on the circuit at the same time ... no bueno. To make this setup work best/safely you would ideally want a dedicated circuit for it which is basically non-existent today.
The safety issues really do need to be addressed because the folks most likely to use these systems are apartment dwellers and I don't think anyone wants to increase fire risk in these scenarios.
This is not it. Not only is there a microinverter and a breaker there to address that issue, but my understanding as a layman is the load in the circuit is down to how much you're drawing (i.e. if you're generating 1200 behind the microinverter and pulling 1500 you're pulling 1500 through the circuit, not 2700).
The bigger fire hazard here is the battery many of these come with for storage, honestly.
That's not to say there isn't a bit of a risk. You need to be careful if you need to do something in the installation that you disable both the grid breaker and the microinverter. Otherwise it's entirely possible for the grid safety to blow and the inverter to keep pumping power into your house. But as the previous poster says, there's a reason these are legal to install in apartments all over Europe, and it's not just European grids being set for higher amps. FWIW, most of these kits come with 800W max out. My understanding is they're perfectly fine to use as a cost mitigation and they'll keep your fridge going in a blackout but no, they won't be constantly tripping your fuse.