TUHO: imho se to neujme,
https://dothemath.ucsd.edu/2011/09/got-storage-how-hard-can-it-be/
Gravitational Storage
Hydroelectric dams and pumped storage solutions rely on the gravitational energy stored in an elevated mass. What could we do in a home environment? Could we get much out of our personal pumped storage tank on-site?
Let’s start small by considering the 3 W-h of energy stored in a AA battery, as computed above. One kWh of energy is 3.6×106 J of energy, so our AA battery stores 10,800 J of energy. A mass of m kilograms, hoisted h meters high against gravity at g≈10 m/s² corresponds to E = mgh Joules of energy. If we were willing to hoist a mass 3 m high, how much mass would we need to replace the AA battery? Have a guess? The answer is 360 kg, or about 800 lb. A battery the size of your pinky finger beats the proverbial 800 lb gorilla lifted onto your roof!
The lesson is that gravitational storage is incredibly weak. A volume of water the size of our bedroom raised even 10 m above our home in a precarious threat to the neighbors would store 0.625 kWh. That’s enough for 30 minutes of typical household electricity consumption. You’ll forgive me if I ignore efficiency losses. It’s not even worth the effort. It’s over.
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360kg ve výšce 3 metry ti (bez započtení účinnosti, ztrát atd) dá hypoteticky maximálně 3Wh! Můžeš násobit - 3,6T ve výšce 30 metrů a máš 300Wh, to je na běh počítače na 3 hodiny... gravitační úložiště max jako přečerpávací vodní elektrárny, jinak to nemá smysl