Solarpunk technology

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Technology for a Solar-Punk future.

Airships and hydroponic farms...

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Powering a Car with Liquid Air - Peter Dearman (yt.artemislena.eu)

submitted 2 years ago by Five@slrpnk.net to c/technology@slrpnk.net

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[–] 0x4E4F 1 points 2 years ago* (last edited 2 years ago) (1 children)

Battery-electric is a way to move power. You still need to generate power in the first place - and perpetual motion would be great for the grid, for ships, everything. It just doesn't work.

I wasn't talking about perpetuum mobile, I was talking about the magnets actually spending their magnetic energy... you would have to magnetize them again from time to time.

Nice comic BWT, funny 😂.

[–] SomeoneSomewhere@lemmy.nz 2 points 2 years ago

If you genuinely use the magnets as a battery, they just don't store enough energy. Wikipedia lists Neodymium magnets as storing about 512kJ/m^3, and lead-acid batteries as about the same amount but per litre - so a thousand times more dense.

Remember that energy removed must equal energy added, so you need to find a way to pump those megawatt-hours into the battery.

In addition, energy storage mechanisms generally have to release that same amount of energy when destroyed. A fully charged lithium battery makes a serious fire, especially if it's a big one. A big tank of petrol makes a big fireball, when allowed to mix with air. A spring or a magnet mostly just goes 'bang'.