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Old 12-12-2018, 12:56 PM   #4046 (permalink)
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Originally Posted by All Darc View Post
What is the efficience of this system of energy storage bellow ?

I don't know, but I bet it's very low. It loss energy during conversion to electricity, during pump's motor efficience loss, during conversion again to ellectricity when the water move bellow again moving turbines.

I bet it's not more than 30% efficient.
You are way too low - it is 70-80% or more (including evaporation in an open system).

Very similar principles, in systems like train cars on a slope, or weights in towers - would be even more efficient - about 85%:
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