this post was submitted on 29 Jul 2024
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[–] catloaf@lemm.ee 4 points 3 months ago (2 children)

That's good then. Although I hope they also considered what happens if there's two of them on a circuit, because if the mains power goes off, but there's another panel on the same circuit, they'd each see the other's voltage on the line, right?

And yeah, you should verify that a circuit is de-energized after you flip the breaker, but I've seen both some real weird electrical work, and some electricians who aren't that careful.

[–] DaBPunkt@lemmy.world 11 points 3 months ago (1 children)

They generate no frequency so the situation you fear is not possible.

[–] catloaf@lemm.ee 5 points 3 months ago (1 children)

The panels themselves are DC, but there's an inverter feeding 120V 60Hz (or whatever) into the wall, right?

[–] silence7@slrpnk.net 16 points 3 months ago* (last edited 3 months ago) (2 children)

Yes, but it's a system that is designed to sync with the frequency of whatever other electricity is out there, and it shuts of if the main shuts off. Almost all rooftop systems without a battery in the US are set up the same way.

Still, it's important to check that things you think are disconnected do not have current flowing through them. And this makes it more important.

[–] laverabe@lemmy.world 1 points 3 months ago (1 children)

Pure sine wave or modified? Modified (square wave) are not good for electronics, particularly computers.

[–] silence7@slrpnk.net 1 points 3 months ago

The answer likely varies by model. Check.

[–] SkavarSharraddas@gehirneimer.de 4 points 3 months ago

Although I hope they also considered what happens if there's two of them on a circuit

The regulations allow only for one. If you want a bigger install than that you need individual approval I think.