this post was submitted on 14 Jul 2025
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A lighthouse uses the same lens, just with the light coming from the inside. Since this is old knowledge, what is the drawback? Why isn't this widespread?
My completely uninformed guess:
The lens and assembly costs too much compared to just more solar panels
The lens/panel combo is so bulky/prone to failure it becomes unreasonable to actually install/use.
The article states that it’s smaller and cheaper. The reason it’s not widespread is that they just invented it.
It is interesting that someone just recently thought to use a fresnel lens with photovoltaics when they’ve existed for hundreds of years
It isn't that. They have been talking about Fresnel lenses on PV for decades. It's solving the heat issue and the size issue. A Fresnel lens gathers a large area of light and focuses it down, including focusing the heat. Normal PV cells cannot handle that amount of heat.