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this post was submitted on 25 May 2024
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What's wrong with that? That's how basically any balcony solar system works.
The cables in your walls are designed for a certain maximum current before they start to heat up. This current is limited by your breaker.
Now if you introduce a plug in solar setup your current is limited by your maximum breaker capacity + whatever your solar setup can generate.
So if I'd use the specs from the article and apply it to a normal dutch home situation: 16A breaker, + 800W at 230V, which means ~3.5A = 19.5A max. which is probably still fine for short durations.
But now some genius doesn't read the fine print and hooks up 2 or 3 on the same circuit. There is no electrician that tells him that's dangerous because it's all self installed and he doesn't know any better. And all of a sudden you are up to 26.5A and you got glowing, smoking wires in your walls...
Also, emergency service hazard. The PV won't turn off if firefighters take out the mains, which makes a house potentially inaccessible during an emergency.
I looked into these before and believe the inverters shut off if the mains shuts off. The DC side of the circuit would still be potentially dangerous though.
The inverters need there to be power in the mains circuit because they convert DC to AC and match the phase of the AC power they are generating to the mains supply.