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How Germany outfitted half a million balconies with solar panels (grist.org)

submitted 1 month ago by alyaza@beehaw.org to c/news@beehaw.org

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Weyland is one of hundreds of thousands of people across Germany who have embraced balkonkraftwerk, or balcony solar. Unlike rooftop photovoltaics, the technology doesn’t require users to own their home, and anyone capable of plugging in an appliance can set it up. Most people buy the simple hardware online or at the supermarket for about $550 (500 euros.)

More than 550,000 of them dot cities and towns nationwide, half of which were installed in 2023. During the first half of this year, Germany added 200 megawatts of balcony solar. Regulations limit each system to just 800 watts, enough to power a small fridge or charge a laptop, but the cumulative effect is nudging the country toward its clean energy goals while giving apartment dwellers, who make up more than half of the population, an easy way to save money and address the climate crisis.

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[–] Geometrinen_Gepardi@sopuli.xyz 5 points 1 month ago (2 children)

I'm confused how that works. The article says the panels are connected to an inverter that plugs into a wall outlet. Does that mean the inverter has a male plug with 230V at the prongs and by connecting that to the wall it connects in parallel to the apartment's electricity circuit?

[–] barsoap@lemm.ee 8 points 1 month ago* (last edited 1 month ago)

Yes in principle to male plug, no to 240V unless the inverter sees a frequency to sync to. They won't power anything during a power outage that requires the whole electrical installation to be set up for it so you don't leak power to the outside and fry a lineman. Also that inverter attaches to one phase only which means that its power won't even reach 2/3rds of your circuits. It does make the power meter go backwards though which is the point.

That said, ideally you're using Wieland plugs and not Schuko so you won't have exposed prongs. The VDE certified Schuko for feeding in up to 800W though and that's exactly the amount parliament said doesn't require a permit or even talking to your utility. If you're doing everything new going with Wieland is the sane choice those outlets don't cost a fortune, if it's an existing installation though a) your landlord might not like it and b) electricians will demand more in travel costs than the outlet is worth.

[–] Didros@beehaw.org 2 points 1 month ago

The inverter is a device that converts the DC power from the solar panel to the AC power that homes are wired for.