this post was submitted on 29 Jul 2024
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[–] [email protected] 12 points 3 months ago (2 children)

You just plug them into an outlet? Is there no safety concern about backfeeding power, especially if someone turns off the breaker and expects a circuit to be de-energized?

[–] [email protected] 32 points 3 months ago (1 children)

They're not supposed to be grid-forming and should turn off if there's no grid voltage. And if you turn off a breaker you should always check that there's no voltage, you might've turned off the wrong breaker.

[–] [email protected] 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.

[–] [email protected] 11 points 3 months ago (1 children)

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

[–] [email protected] 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?

[–] [email protected] 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.

[–] [email protected] 1 points 3 months ago (1 children)

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

[–] [email protected] 1 points 3 months ago

The answer likely varies by model. Check.

[–] [email protected] 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.

[–] [email protected] 2 points 3 months ago

Yeah that would worry me, plugging a power source into a wall socket.

I would much rather build an independent little cart with panels and a battery and a charge controller and an inverter and use it the way you would a generator. I would rather pay the power company full price to run my refrigerator and nothing at all to recharge my lawnmower than 98.3% for both.