Solar panels have always bothered me because they require such intense manufacturing and usage of scarce resources. TLDR of article: “Many people will argue that if low-tech solar panels are less efficient, we would need more solar panels to produce the same power output. Consequently, the resources saved by low-tech production methods would be compensated by the extra resources to build more solar panels. However, efficiency is only crucial when we take energy demand for granted, sacrificing some efficiency may gain us a lot in sustainability.”
We prefer the most efficient solar panels where space is limited, such as rooftops, however there are vast areas of the earth that are almost unused sunny desert, perhaps there low-tech could make more sense?
Please be careful with terms like “unused desert”. Whatever “green” developers call unused land is usually some kind of ecosystem with an established community of human and non-human inhabitants. They are forced out and big “green” money moved in, with their hydro, wind, solar, lithium mining …
Forest mountain landscape not far from here will be torn up for another green tech, lithium, because those who can afford it want to get to nice forest mountain landscapes in their eco cars, for their eco holidays. Pasture lands not far from here are now filled with the stupidest of solar installations: nothing but panels. They could have the same old herds of before clean the land between the panels, but instead its all fenced off and probably treated with roundup, or motorized machines. And people want more cars, more air conditioning because every summer it gets hotter, and the spiral of “ever more” continues.
Calling arid or not obviously landscaped spaces far away from you “unused” is dangerous and will expose the last wild landscapes of earth to abuse. It’s bad enough as it is.
Well I was thinking of the central Sahara, and parts of Arabia etc., these areas really are vast. Sure it would change the landscape, but not so much life. It may be better to make cheap (the op is about low-tech) electricity there, than for example get to 1.5ºC pathways by BECCS (generate electricity with biofuel from plantations, then pump CO2 underground) which is much worse for biodiversity. Your examples - forest mountain, pasture - wouldn’t be called desert - at least not in english (the interpretation may vary with language), it’s a more extreme term than arid.
If solar energy is collected from such remote areas, is there perhaps a show-stopping problem of transmitting that power out to city? Transmission has huge losses over great distances.
There was a recent proposal to cover train tracks and (I think) some segments of rivers with solar panels. One of the problems IIRC was transmitting the power. My memory is a bit fuzzy on it… not sure why they couldn’t just directly power the electric train that runs below them… but whatever the issue was, it might be the same issue as the desert would have.
Your examples - forest mountain, pasture - wouldn’t be called desert - at least not in english (the interpretation may vary with language)
You can’t really trust layperson’s common English here. There are vast forests which are not being tagged as “forest” because a majority of trees don’t reach a certain defined height. These non-forests are useful for decarbonization but they’re being cleared on the basis that they are not technically a “forest”. So now there is a movement to protect these non-forests.
that website is still alive ? how nice
also we need to achieve net positive: pv panel factories need to be fully powered by solar, else a panel would always carry some carbon footprint
I love how that site is not in the slightest enshitified, just as we would expect for something with low-tech in the name. No CAPTCHAs or popups, cookie walls or other bullshit. Very hard to find good websites like this. Search engines should give that site a top ranking.
agreed, it is a fantastic website. I wish there were more like it.
I ordered their paperback magazine, which can be printed on demand. Looking forward to reading it
The article has a slight oversight - it is a bit behind the state of the art.
S. Korea develops technique to recycle discarded solar panels into high-performance solar cells
South Korea moves forward with long-expected solar panel recycling scheme
Reclaiming the aluminum has been possible for a long while. Reclaiming the glass has been “not worth the effort”. Reclaiming the doped silicon is apparently a reality in South Korea, however.
As for the story itself, wow - very interesting. :)
“My hypothesis is that George Cove stumbled upon a Schottky contact photovoltaic cell, decades before it was described by Walter Schottky. 21 There is the possibility of both photovoltaic (predominantly) and thermoelectric responses from these devices. The plug was an alloy of zinc and antimony – which we now know is a semiconductor. It was alternately capped by German silver (a nickel, copper, and zinc alloy) and copper on opposite ends. This formed an ohmic contact and Schottky contact, respectively. This is a photovoltaic device.”
According to Philip Pesavento, George Cove probably started with “German silver” as the negative material on both ends of the plugs, and an antimony-zinc alloy (ZnSb) as the positive material. These were the best available thermoelectric materials at the time:
“He probably ran out of German silver and substituted copper to finish making up a bunch of plugs since the difference in thermoelectric voltage between using copper and German silver was small. Then, during testing, Cove noted that these plugs (with a German silver cap at one end and a copper cap at the other end) gave a much greater voltage: 100s of mV’s versus the usual 10s of mV for a thermoelectric generator.”
