this post was submitted on 14 Jul 2025
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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.

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[–] MaggiWuerze@feddit.org 7 points 1 day ago (4 children)

Wouldn't this be negated by the fact, that the same area of roof now has less actual PV cell on it? Since the light gets concentrated on a smaller area?

[–] calculuschild@lemmy.zip 4 points 1 day ago (1 children)

I think the point is that you can replace one big solar panel with one big lens and a small solar panel. The footprint on the roof is the same, but the implication is a big glass lens is cheaper than a big solar panel.

[–] gandalf_der_12te@discuss.tchncs.de 1 points 21 hours ago* (last edited 21 hours ago)

the glass lens probably is cheaper than a big solar panel

but the cost of setting up a glass lens in 5-10 meters altitude (because that's what's needed to bundle any sunlight) and make it storm-proof is probably more expensive than setting up a big solar panel at hip height.

and considering that labor cost is a significant part (i guess 10% - 50%) of overall solar park cost, i guess it's probably not worth it.

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