this post was submitted on 20 May 2025
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First image is of an overcast sky with a guy with two nearly-vertical solar panels
Third image is of a small solar panel under a roof receiving a little bit of light at an extreme angle through an opening in a covered attic balcony
Here's a solar farm in the US:
https://www.energy-storage.news/wp-content/uploads/2024/08/de-shaw-1024x731.jpg
It's pulling a lot more power per panel.
Another:
https://www.fhwa.dot.gov/ipd/images/project_profiles/img_az_navajo_nation_kayenta_solar_program.jpg
Another:
https://cdn.orsted.com/-/media/feature/vocastimport/orsted_permianenergycenter_cod_0398_698890436958977.png?mh=1440
Does it make sense to stick solar panels on a house relative to drawing power from a solar farm? Sure, it can, if your house is remote and it's costly to connect it to the grid, or if what you're after is a secondary, backup source of power if you lose grid connectivity.
But if what you want is cost-effective generation, it's preferable to stick a panel on a solar farm somewhere where one can leverage economies of scale, maintenance is easy and done by someone who maintains a ton of these on a regular basis, and where you're optimizing location and panel orientation for solar potential.
Like, if you want more solar power on the European grid, you probably want more solar farms in Spain, which has substantially more solar potential than Germany:
https://globalsolaratlas.info/
Not someone sticking them on their balcony in Germany.
What Germany could do to help solar and wind, if it wants to do so, is drop complaints about building (inexpensive) above-ground transmission pylons, which would help smooth out different generation at different locations on the European grid.
https://www.cleanenergywire.org/news/farmers-and-grid-operators-demand-end-rules-prioritising-underground-power-lines-germany
EDIT: If you want to criticize the US for something as solar goes, it'd probably be Trump throwing tariffs on everything, which makes it more costly to deploy solar panels and other electrical hardware manufactured abroad.
I think you're comparing apples to oranges.
The main selling point for a "Balkonkraftwerk" is that it's cheap and doesn't require an electrician to install.
That way they pay off rather quickly and result in a lower electricity bill when you look at a span of 10-15 Years.
Solar farms in Spain on the other hand require massive investments in Infrastructure and the farms themselves. Not to say they're a bad idea, but it's a very different thing.
In the US, a lot of problems have arisen around residential solar installation companies providing loans using questionable, if not outright fraudulent sales tactics based around misrepresenting returns.
https://time.com/6565415/rooftop-solar-industry-collapse/
Companies running solar farms, on the other hand, have bean-counters in place who are in a legitimate position to run the numbers, and those companies take on the risk themselves. With residential solar, it's not companies saying "hey, we'll put our capital on the line, and just want somewhere to put a panel", it's "here's a graph and some numbers, and there's a great investment opportunity for you with your capital...just sign on the line here!" Needless to say, this opens the door to a lot of potential unpleasantness.
EDIT: If a company sends a guy to your doorstep to tell you how they have a fantastic investment opportunity for you and your money which will make you a great return, a good response is to ask them why they don't want to make the investment themselves. Is it generosity on their part, letting you enjoy the benefit of the investment?
If a solar panel installer wants to put panels on a roof I own, that's fine with me. All they have to do is pay me for the space on my roof and cover the cost of the hardware and its installation. In return, I will let them have the entire value of the generation done, rather than taking it myself. If this is a legitimate investment with a valid return for the party putting money down, then they should be happy to do that.
One notices that there are no residential solar installer companies who are engaging in that sort of arrangement. Cell tower companies do that with cell infrastructure, but not residential solar installers. Hmmm.
The whole argument is that you need neither a loan or a professional installer for a Balkonkraftwerk. Your're completely missing the point.