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#ecologie #solaire #energie #energiesolaire #panneauxsolaires #lowtech

Des panneaux solaires low-tech, ça existe ? Ils ont peut-être été inventés en… 1900 ! soit 40 ans avant les premières cellules photovoltaïques.

https://www.lowtechmagazine.com/2021/10/how-to-build-a-low-tech-solar-panel.html#more (anglais)


in 1909, Technical World Magazine wrote that “such a machine is cheap and indestructible as a kitchen range. Even in its present and somewhat crude and experimental state, given two days of sun, it will store sufficient electrical energy to light an ordinary house for a week. The inventor has proved this now for months in his establishment”.
Un petit détail, il ne comprenait pas comment ça marchait :p (au départ il voulait faire autre chose)
George Cove did not understand how his solar generator worked, and neither did anyone else at the time. It was only with Einstein’s work on the photoelectric effect (in 1905) and later work in quantum mechanics (1930s and beyond) that the concept of a semiconductor bandgap was realized.
Il aurait découvert le contact de Schottky
“My hypothesis is that George Cove stumbled upon a Schottky contact photovoltaic cell, decades before it was described by Walter Schottky.

What happened? By using copper, Cove had unknowingly built a Schottky junction. That converted his thermoelectric generator into a “thermophotovoltaic generator.” Such a device works the same as a photovoltaic solar cell but on a different wavelength.
Et le low-tech ? Les métaux utilisés seraient moins énergivores à produire et entièrement recyclables. La méthode serait moins efficiente, mais on pourrait construire les éléments encore plus fins que la silicon pour les rendre plus efficients.
recent research into Schottky cells based on other materials seems to confirm this. For example, recent experiments with Schottky selenium cells brought layer thickness back to only 100 µm, compared to between 200 and 500 µm for silicon cells. [27] [31]Scientists also reached 17% experimental efficiency for a graphene/silicon Schottky cell, up from 1.5% ten years earlier. [26]
et
We can also question the current obsession with higher efficiencies

Qu'est-il arrivé à cet inventeur ?


Wow, la fin est pleine de mystères. Peut-être a-t-il été victime de la
#Edison Electric Illuminating Company of New York, whose unscrupulous practices against competitors are well-documented.
#solar #energy #solarenergy #photovoltaic #schottky
 
#ecologie #solaire #energie #energiesolaire #panneauxsolaires #lowtech

Des panneaux solaires low-tech, ça existe ? Ils ont peut-être été inventés en… 1900 ! soit 40 ans avant les premières cellules photovoltaïques.

https://www.lowtechmagazine.com/2021/10/how-to-build-a-low-tech-solar-panel.html#more (anglais)


in 1909, Technical World Magazine wrote that “such a machine is cheap and indestructible as a kitchen range. Even in its present and somewhat crude and experimental state, given two days of sun, it will store sufficient electrical energy to light an ordinary house for a week. The inventor has proved this now for months in his establishment”.
Un petit détail, il ne comprenait pas comment ça marchait :p (au départ il voulait faire autre chose)
George Cove did not understand how his solar generator worked, and neither did anyone else at the time. It was only with Einstein’s work on the photoelectric effect (in 1905) and later work in quantum mechanics (1930s and beyond) that the concept of a semiconductor bandgap was realized.
Il aurait découvert le contact de Schottky
“My hypothesis is that George Cove stumbled upon a Schottky contact photovoltaic cell, decades before it was described by Walter Schottky.

What happened? By using copper, Cove had unknowingly built a Schottky junction. That converted his thermoelectric generator into a “thermophotovoltaic generator.” Such a device works the same as a photovoltaic solar cell but on a different wavelength.
Et le low-tech ? Les métaux utilisés seraient moins énergivores à produire et entièrement recyclables. La méthode serait moins efficiente, mais on pourrait construire les éléments encore plus fins que la silicon pour les rendre plus efficients.
recent research into Schottky cells based on other materials seems to confirm this. For example, recent experiments with Schottky selenium cells brought layer thickness back to only 100 µm, compared to between 200 and 500 µm for silicon cells. [27] [31]Scientists also reached 17% experimental efficiency for a graphene/silicon Schottky cell, up from 1.5% ten years earlier. [26]
et
We can also question the current obsession with higher efficiencies

Qu'est-il arrivé à cet inventeur ?


Wow, la fin est pleine de mystères. Peut-être a-t-il été victime de la
#Edison Electric Illuminating Company of New York, whose unscrupulous practices against competitors are well-documented.
#solar #energy #solarenergy #photovoltaic #schottky
 

Switching to Renewables: How much energy is available?


A reasonably good explainer on the potential for powering humanity on solar power: It's interesting and better information than I'd feared, though it still omits a lot, mostly in terms of baked-in assumptions of energ consumpion increases from future wealth and population increases. An apparently-large solar energy surplus rapidly diminishes within just the next century.


Basic facts:

  • Global energy consumption is about 400 quadrillion BTU (quad), or 10,000 million tonnes of oil equivalent (mtoe), or 115 petawatt hours (PWh -- 115 million GWh) equivalent. Those are units, and they're big. The important thing is to look at the total amounts and what they translate to on a per-person basis.
  • US consumption is about 100 quad, / 2,500 mtoe.
  • Total incident raw solar power is about 7,000 times human energy use. That's what "as much solar energy falls on the entire Earth in 1 hours as humans use in an entire year" translates to. But after figuring in various losses (land vs. water, usable daily hours, panel efficiency, other losses), what's left is closer to 100--200x current total human energy use. And some of that's got to go to both our own food supply and the rest of the environment.
  • The Rest of The World (Non-OECD countries / countries outside North America, Western Europe, Japan, Australia) uses a tiny fraction of the energy of the West. That's 6x the people (roughly) and about 1/3 the per-capita energy use. Note that this includes China and India, which have greatly in creased energyy usage per capita over the past 3 decades as they've industrialised.
  • Global population is projected to grow to somewhere between 9--12 billion by 2100 or so.
  • There's still the question of energy storage, dispatchable energy use, and the need for fuels in transportation uses, most especially marine shipping, air travel, and rockets, none of which can rely on battery or grid-supplied electricity.
Even just accounting for present population and average OECD consumption, that's another 6 * 3 or 18 time more energy consumption that is presumed just to bring the rest of the world up to average OECD levels of energy affluence.

We only had about a 100x headway in net solar energy surplus to begin with, this would cut through about 1/5 of that. Without considering future energy growth or additional energy affluence among either OECD or other nations.

Efficiency gains, especially reducing the two-thirds of all energy lost (mostly in conversion from thermal to mechanical energy) will buy us back some of that, but this is a one-time bonus, and it's going to be much less than the total lost energy. The 2nd Law of Thermodynamics always wins out, and there will be energy efficiency losses.

We're using a lot of energy, and the dreams we're selling our children and the world involve a huge increase on even that. I don't doubt that the future will be solar powered, mostly. I do have doubts it will be a high-energy solar future.

Again, the ultimate critique here is not against renewables. We have no other choice. Our high-energy, large-population lifestyle is inherently unsustainable.

Data:


OECD:
- 3,784 mtoe energy (2018)
- Population: 1.3 billion (vs. 7.8 billion global, -> 6.5 billion non-OECD)
- Per-capita consumption: 2.9 tonoil (7.6 tonoil US).
- 38 member states: Australia, Austria, Belgium, Canada, Chile, Colombia, Costa Rica, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Israel, Italy, Japan, Latvia, Lithuania, Luxembourg, Mexico, Netherlands, New Zealand, Norway, Poland, Portugal, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, Turkey, United Kingdom, & United States.

Non-OECD
- 6,216 mtoe
- population: 6.5 billion
- Per-capita consumption: 0.96 tonoil
OECD energy and demographics from:

https://www.iea.org/reports/key-world-energy-statistics-2020/final-consumption
https://en.wikipedia.org/wiki/OECD

#Energy #Resources #Limits #Solar #SolarPower #LimitsToGrowth #Population #DoTheMath #Video #YouTube
 
#Solar #Strom #Energiewende #balkonkraftwerk #guerilla #pv

Hier ist meine 600 Wp Anlage, die seit 1 Woche läuft und bereits > 10 KWh ( danke @Paula Gentle on Friendica ) erzeugt hat.
Dank Hausautomatisierung ist noch nicht 1 Watt unvergütet ins Netz zurück gegangen !!

Bilder:

Image/Photo


Image/Photo




 
#Solar #Strom #Energiewende #balkonkraftwerk #guerilla #pv

Hier ist meine 600 Wp Anlage, die seit 1 Woche läuft und bereits > 10 KWh ( danke @Paula Gentle on Friendica ) erzeugt hat.
Dank Hausautomatisierung ist noch nicht 1 Watt unvergütet ins Netz zurück gegangen !!

Bilder:

Image/Photo


Image/Photo




 

Spiffy Summer Project Sources Solar Sounds From Scraps





#art #beam #beamrobotics #beepboop #circuitbending #pvsolar #solar #hackaday
posted by pod_feeder_v2
Spiffy Summer Project Sources Solar Sounds From Scraps
 

Spiffy Summer Project Sources Solar Sounds From Scraps





#art #beam #beamrobotics #beepboop #circuitbending #pvsolar #solar #hackaday
posted by pod_feeder_v2
Spiffy Summer Project Sources Solar Sounds From Scraps
 
Image/Photo

#SolarManOfTheAtom #22 (1991) #JoeQuesada Cover, #PeterGrau & #StanDrakel Art, #KevinVanhook Story Master Darque continues to manipulate #Solar into questioning his actions and thoughts and put him deeper into trouble... https://www.amazon.com/dp/B08NK94JD8

 

Let The Solar Free





#arduinohacks #solarhacks #thehackadayprize #2020hackadayprize #canbus #chargecontroller #raspberrypi #solar #hackaday
posted by pod_feeder_v2
Let The Solar Free
 

Let The Solar Free





#arduinohacks #solarhacks #thehackadayprize #2020hackadayprize #canbus #chargecontroller #raspberrypi #solar #hackaday
posted by pod_feeder_v2
Let The Solar Free
 
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