Re: Flow batteries?
2. You need to move a lot of water. My cocktail napkin says you need to move about a cubic meter of water through 100 vertical meters to store 1kwh of energy.
One ton (1 cubic meter of H2O) through a 100m drop will yield 1000*100*9.8 Nm, rounded 1MJ, which is a bit under 0.28kWh
Biting the hand that feeds IT
