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this post was submitted on 29 Jul 2024
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These plugin systems are quite interesting, they allow renters for example to get some benefits of Solar without having to make permanent installs. The systems a lot cheaper than a full setup but obviously don't produce the same amount of power. I first saw them appearing in France and then since Germany changed the law to allow them its good to see it flourishing there too. This isn't going to save the planet but its a little step of improvement.
400 Euro isn't bad for all the fittings and inverter and the big benefit of these DIY systems is you just put them together and connect them to a standard wall socket. Constantly just saves you money on your bills when there is sunshine. Its also not enough power that its worth dealing with export tariffs but in countries where smart meters already exist it could be part of the mix.
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?
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.
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.
They generate no frequency so the situation you fear is not possible.
The panels themselves are DC, but there's an inverter feeding 120V 60Hz (or whatever) into the wall, right?
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.
Pure sine wave or modified? Modified (square wave) are not good for electronics, particularly computers.
The answer likely varies by model. Check.
The regulations allow only for one. If you want a bigger install than that you need individual approval I think.
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.
How does that work with the fuse box? Like mine has a 100A fuse for the whole house, but a bunch of smaller fuses for e.g. downstairs, upstairs, lights, etc. Does it only work on the circuit it's connected to or what?
It can power across the circuits its all technically the same electrical connection within a house. These systems are relatively small due to the constraints of a typical standard plug and the amps it can support so they tend to be limited to less than half of the total power on a loop.