Solarpunk technology

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Didn't know the blades couldn't be reused.

"To help feed the country’s population, an inventor, Toufic Hamdan, created a commercial bakery to bake bread in solar ovens. The startup “Partners With Sun” has installed a solar convection oven on the bakery’s roof. The Solar Oven uses large silver mirrors to capture and magnify the sun’s rays to build heat. The heat is transported by a transfer fluid which is then used to help operate a convection oven, allowing it to reach a baking temperature of between 300 and 400 Celsius. The heat is used directly in food and beverage production. " Baking Bread in a Solar Oven | Happy Eco News

According to the company website, “The Solar Oven cuts up to 80% of the bakery’s fuel bill.”

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cross-posted from: https://sh.itjust.works/post/22143150

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cross-posted from: https://lemmy.world/post/17369469

Derek Sherrell shows a low cost, open source house that he built in 90 days. He is giving away the plans for free for anyone who wants to build their own.

Open source is a wonderful concept that should be applied to everything, not just software.

I wanted to park my bikes - or depending on the Season - my Renault Twizy somewhat protected and easy accessible.

After adjusting the yard fence to form a pocket I put a frame aluminium profiles on top. On top of that is a second frame which is angled at 10 degrees and on that are the solar panels.

10 degrees seem to be a viable compromise between self cleaning, sun capture, construction height and openings to the elements on the side.

It was much more challenging than i thought to find solar modules with a form factor fitting the shed.

4 Standard modules where far to big. So I choose two modern 410 Wp modules and 3 130 Wp “camping” modules.

I got two 600 W dyne (“Bosswerk”) Micro-inverters cheap, because everybody want’s 800 W now and they have a regulatory issue with a missing relay.

The 130 kWp panels are cabled serially but still seem to have issues getting enough voltage to start the inverter in the morning.

I’m happy with the project. Things in the shed are getting much less wet during rain und not baking hot during sunshine.

I might close the gaps between the panels obe day but that is low priority- the thing was never meant to be totally watertight.

I also like it being some kind of Solarpunk landmark in our street.

I feel this is a bit disingenuous. Especially as Michelin are working on airless tires. We all know that tires as we know them have planned obsolescence as a fundamental part of their design. They're already a blight on our environment, the only good thing to do now is to ensure that as few new tires are needed as possible, not for them to be green washed.

cross-posted from: https://feddit.org/post/261388

• China’s energy regulator said it will limit “low-end” solar panel manufacturing after industry leaders called for more government intervention earlier this month. The move is an acknowledgement by Beijing that solar panel overcapacity is a problem, one that has pushed Chinese solar firms into a price war and shriveled returns.
• The competition in China’s solar power industry is “indeed very fierce,” an official at the National Energy Administration (NEA) said at a press conference Thursday.
• A price war on solar panels in China has meant that big firms have rapidly lost profit while small firms risk bankruptcy.
• Historically, the industry has been propped up by city governments, which build solar panel factories to lease or sell to private firms. But while some local authorities have expressed willingness to continue to keep solar firms afloat, “that support may dry up as the provinces are themselves swimming in debt, largely stemming from the country’s property crisis, and solar has to compete for their support with other green tech sectors, like electric vehicles, that are also struggling with overcapacity.
• Chinese officials want homeowners to install solar panels to combat overcapacity, but China’s grid is still not able to accommodate fluctuating solar energy levels.
• One solution may be virtual power plants: smaller-scale grids that rely on local renewable energy infrastructure and incentivize homeowners to use that energy during peak times with cash payments. But beyond building a new grid meant to handle renewable energy, China also needs “improved coordination” from Beijing to enable solar-heavy provinces to trade energy with solar-weak provinces.
• China’s energy regulator is also pushing for more spot trading — where prices will fluctuate with supply and demand — rather than fixed rates, encouraging customers to use energy during low-demand periods.

A friend worked on that subject and I found it pretty cool:

Animals often hide, flee or avoid sources of human noise. But to what extent? Which species do it more? What noises disturbs the most? They made a camera + speaker device triggered by animal presence and observed their reaction.

Interestingly what animals tend to fear the most is the sound of humans chatting. They probably recognize other animals in human voices, but vehicle sounds seem to confuse them more, though still triggers vigilance reactions.

A simple mix of two cheap salts, Sodium Sulfate and Table Salt (Sodium Chloride) dissolved in boiling water can create a really useful Phase Change Material that has a melting point of 18c (65f) which allows it to be recharged back into it's cooling state simply by putting it in a basement and can then be used as a cooling blanket, back rest, neck pillow, etc to help keep you cool in hot weather. Longer lasting and less energy intensive to charge than an ice-pack.

In the video he talks about the potential for using a similar higher temp PCM behind solar panels to reduce efficiency loss or damage from over heating. It could also be a really interesting thing to use for transporting heat from where it's unwanted to where it's needed.