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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[–] 23 points 1 year ago (13 children)

https://ieeexplore.ieee.org/document/10938951

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.

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  • [–] 4 points 1 year ago (10 children)

    Solar panels as fences is what is needed.

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  • [–] 7 points 1 year ago (7 children)

    Kinda works if you use bifacial panels.

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  • [–] 2 points 1 year ago* (6 children)

    Bifacial panels as a fence provides 3% extra yield but 30% extra revenue

    https://www.gridcog.com/blog/solar-fence-vs-ground-mount-solar

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  • [–] 1 point 1 year ago* (last edited 1 year ago) (5 children)

    Sure, but if you wanted solar panels to work on both sides of your East/West facing fence, you'd have to buy 100% more panels, so bifacial saves you 70% there. Seems like a good deal. I'm sure you read the "Model Overview" of that article and caught that the monofacial panels were facing the equator, and the bifacial panels were facing East/West...

    Edit: bad read on my part, I didn't not understad the full content of the previous message.

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  • [–] 3 points 1 year ago (4 children)

    I don't think we are arguing. I was just giving you more details.

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  • [–] 1 point 1 year ago (3 children)

    My interpretation of your comment was that bifacial solar panels are a useless gimmick which allows companies to charge more for a cheaper product.

    Is that correct?

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  • [–] 3 points 1 year ago (2 children)

    No, the opposite. They are superior. Bifacial panels have a 3% additional yield over standard panels. The +10-20% cost premium is covered by the +30% revenue

    Even with traditional mountings, Bifacial panels pick up extra light reflected from the ground.

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  • [–] 1 point 1 year ago (1 child)

    You are at least completely and utterly wrong about tracking solar not typically being built anymore. Any major solar site uses tracking if you have a couple acres on a corner maybe not but I think you are being a bit too general. Panels are only one of many costs per solar panel installation, its still cost effective overall to increase efficiency.

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  • [–] 1 point 1 year ago

    You're right about US. seems half uses tracking. No numbers on China which is 30x larger market. Economics still only make sense at consumer level of $1/watt panel prices, to me, but I guess there are reasons I don't understand.

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