You make them convex.

You can shape them that no matter how the light falls on it, it will align to the center. Kind of like how satellite dishes work but in reverse.

Marketing. Fresnel lenses are not going to do well with diffuse light.

Could have some refraction or hologram thing that bends the light the right way, maybe? Or like a matte glass that equalises the load.

Or why not just use (big) mirrors?

Won't help with heat ofc!

That was Fraunhofer IIS not ISE.

cross-posted from: https://slrpnk.net/post/24690127

Solar energy experts in Germany are putting sun-catching cells under the magnifying glass with astounding results, according to multiple reports.

The Fraunhofer Institute for Solar Energy Systems team is perfecting the use of lenses to concentrate sunlight onto solar panels, reducing size and costs while increasing performance, Interesting Engineering and PV Magazine reported.

The "technology has the potential to contribute to the energy transition, facilitating the shift toward more sustainable and renewable energy sources by combining minimal carbon footprint and energy demand with low levelized cost of electricity," the researchers wrote in a study published by the IEEE Journal of Photovoltaics.

The sun-catcher is called a micro-concentrating photovoltaic, or CPV, cell. The lens makes it different from standard solar panels that convert sunlight to energy with average efficiency rates around 20%, per MarketWatch. Fraunhofer's improved CPV cell has an astounding 36% rate in ideal conditions and is made with lower-cost parts. It cuts semiconductor materials "by a factor of 1,300 and reduces module areas by 30% compared to current state-of-the-art CPV systems," per IE.

Yeah the problem has always been that solar panels only really like to operate within a very narrow temperature band. It's why you can't just plate the Sahara desert in solar panels. In theory that would generate loads of power but the heat of the desert is way outside of their operating range.

There's been loads of ideas to heat/cool solar panels, the problem up until now has always been to do that without cutting into the panel's efficiency so much that it isn't worth doing.

But there's been videos on YouTube of people cooling solar panels with plasma cooling and phase change materials for a few years now.

They probably did, but like they said, the heating is probably the issue.

I can see them adding a cooling element. Maybe even water cooling.

Oh don't worry, I'm sure the capitalist system will manage to fuck it up somehow.

Would a UV filtering lens help? Do solar cells generate more power from certain parts of the light spectrum?

cross-posted from: https://slrpnk.net/post/24690127

Solar energy experts in Germany are putting sun-catching cells under the magnifying glass with astounding results, according to multiple reports.

The Fraunhofer Institute for Solar Energy Systems team is perfecting the use of lenses to concentrate sunlight onto solar panels, reducing size and costs while increasing performance, Interesting Engineering and PV Magazine reported.

The "technology has the potential to contribute to the energy transition, facilitating the shift toward more sustainable and renewable energy sources by combining minimal carbon footprint and energy demand with low levelized cost of electricity," the researchers wrote in a study published by the IEEE Journal of Photovoltaics.

The sun-catcher is called a micro-concentrating photovoltaic, or CPV, cell. The lens makes it different from standard solar panels that convert sunlight to energy with average efficiency rates around 20%, per MarketWatch. Fraunhofer's improved CPV cell has an astounding 36% rate in ideal conditions and is made with lower-cost parts. It cuts semiconductor materials "by a factor of 1,300 and reduces module areas by 30% compared to current state-of-the-art CPV systems," per IE.

Maybe I'm misunderstanding but wouldn't diffuse light be what it's going to be best at? While it'd be worse on a sunny day when there is an optimal single direction for the light to come in?

It's the opposite of a light house fresnel lens - instead of scattering the light source evenly out, it'll capture diffuse incoming rays from random directions better and concentrate it on the photovoltaic cell? However it would be at the cost of being able to capture direct sunlight efficiently as only some of the lens would ever be in the best position to capture the direct rays?

I have not read the article yet, but I will be doing so after posting this. But from what I understand, concentrated cells via lenses already exist. The problem with them was keeping them cool.

Going to go read the actual article now.

Edit: Well, the article was very sparse on details. From what I understand of the comments, what's really been done here is making cells that can stand the kind of heat that would be focused onto them from the glass.

I want to say I saw a video about this a year ago or so, but it was more solar thermal, where you focus a bunch of mirrors onto a single point high up on a tower, and it's cooled by molten salt. But as I said, that's solar thermal, not solar power electricity.

Adding to what Eldest_Malk said: They aren't just putting a new type of lens over standard solar cells, they are also designing/fabricating custom cells to work with the lenses. [I'm not a PV expert, but the fact that the IEEE paper focuses so much on the cells and not just the lenses leads me to believe that the lenses can't just be used with whatever standardized solar cells are on the market]

The scale seems to fit, but what the hell is going on with those tick labels?

Request Rejected

(ieeexplore.ieee.org)

This is 36% MODULE efficiency with expensive cooling. 30% actual year long efficiency without it. Requires dual axis tracking. Seems heavy as its very tall/deep.

Headline of cost reduction is very unlikely. Especially on a per acre/fairly large area basis. Dual axis tracking requires more spacing than fixed orientation rows, and loses benefits under cloudy conditions. While power at 7am and 5pm is more valuable when competing against high penetration solar, batteries are now more competitive than tracking, and can serve edge of day and night power needs. Tracking solar tends not to be built anymore, due to low cost of panels. The cooling infrastructure is also not as useful as it is on rooftops because the heat capture has useful benefits for homes.

It is also unclear how this has advantage over parabolic mirror.

Agri PV is a real use case, where more free land means more land use, even if most of it gets more shade, except around noon.

Solar panels as fences is what is needed.

Yeah the problem has always been that solar panels only really like to operate within a very narrow temperature band. It's why you can't just plate the Sahara desert in solar panels. In theory that would generate loads of power but the heat of the desert is way outside of their operating range.

There's been loads of ideas to heat/cool solar panels, the problem up until now has always been to do that without cutting into the panel's efficiency so much that it isn't worth doing.

But there's been videos on YouTube of people cooling solar panels with plasma cooling and phase change materials for a few years now.

Yeah the problem has always been that solar panels only really like to operate within a very narrow temperature band. It's why you can't just plate the Sahara desert in solar panels. In theory that would generate loads of power but the heat of the desert is way outside of their operating range.

There's been loads of ideas to heat/cool solar panels, the problem up until now has always been to do that without cutting into the panel's efficiency so much that it isn't worth doing.

But there's been videos on YouTube of people cooling solar panels with plasma cooling and phase change materials for a few years now.

Solar panels as fences is what is needed.

I think their approach with module is 20-50x concentration instead of 500x, with cooling permitted to be module wide on air gap, as well as usual bottom cooling.