Energy storage

[Windy_Skies]

@PierreB

Now the first video indicates a speed of 8 kmh, so 2.22 m/s, leading (for 1 ton and by kinetic energy) to 1000 x (2.22)² / 2 = 2469 J per second, so 2469 W until stopping. The time with 4000 m height is only 4000/2.22 = 1800 seconds. So 1 ton of concrete falling from 4000 m at stabilized speed of 2.22 m/s in water will produce about 1.2345 kWh, and the double (2.469 kWh) if falling from 8000 m at stabilized speed of 2.22 m/s (calculations to be verified).

If there is 584/1000 * 1000 * 9.81 * 4000 = 22916160 Joules of potential energy available from an object, and it falls during 1800 seconds, that gives you an average of 12731.2 Watts over those 1800 seconds. You would subtract from that losses like friction.

The eventual speed of the falling weight is after most of it is used to power the generator, so you can’t use that, other than perhaps in calculating how much hydrodynamic losses it still experiences at those speeds.