A German experiment proved that simple concrete spheres make fantastic batteries. Now, California plans to submerge a 9-meter diameter sphere in the ocean and is already planning versions of 30 meters.
farmingdale-observer.com
Storing renewable energy sustainably and efficiently is one of the major challenges of our time. A team of German researchers is proposing a revolutionary solution: concrete spheres immersed in the ocean floor. Their potential is such that California is preparing to test a large-scale prototype. A simple, ingenious concept The…
  • @A_A@lemmy.worldEnglish
    5•1 day ago

    Perfect guess ! (afaik) ρ(concrete) ≈ 2.5 tons/m³
    so full sphere ≈ (2.5 x 382) tons = 955 tons
    they have 400 t so the cavity removes :
    955 - 400 = 555 t … so 7.51m diam. cavity
    … so, yes 3/4m thick wall 😌👍 !

    • @Cocodapuf@lemmy.worldEnglish
      2•14 hours ago

      That’s exactly the way I would have calculated it, glad someone beat me to it though. Thanks!