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cogman10 • yesterday at 6:52 PM • 3 replies • view on HN

I'm seeing round trip efficiencies around 75%.

That's not terrible.

These things would probably pair well with district heating and cooling.

Replies

3eb7988a1663 • yesterday at 7:53 PM

That is shockingly good. EIA reports existing grid scale battery round trip is like 82% which do not have moving parts.

  ...in 2019, the U.S. utility-scale battery fleet operated with an average monthly round-trip efficiency of 82%, and pumped-storage facilities operated with an average monthly round-trip efficiency of 79%....
https://www.eia.gov/todayinenergy/detail.php?id=46756
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lambdaone • yesterday at 8:19 PM

A theoretical study shows 77%, which is in the same ballpark: https://www.sciencedirect.com/science/article/pii/S136403212...

A few percent here of there is not that important if the input energy is cheap enough.

hawk_ • yesterday at 9:08 PM

"I am seeing" as in do you use CO2 batteries at home or something?