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A comment on Ask HN: What interesting problems are you working on?. Parent comment

Re:Ask HN: What interesting problems are you working on? by JoeAltmaier on Wednesday January 29, 2020 @09:48AM (#22181064)
That's about 90%+ efficiency pumping it up, and generating it down (electrical conversion). So maybe 85% total storage efficiency. How's that compare to battery or other storage systems? Lithium is 98% by some sources.
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Re:Ask HN: What interesting problems are you working on? by DoctorOetker on Wednesday January 29, 2020 @10:27AM (#22181526)
the UPHS seems like a durable system that could store and deliver many more cycles than a battery?
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Re:Ask HN: What interesting problems are you working on? by JoeAltmaier on Wednesday January 29, 2020 @11:55AM (#22182730)
Yeah total cost of ownership would tend to even things out.
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