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Rather unlikely that parent confused the two. Supercaps are nice if you don't mind trading their ~<1/5 energy density (mass, volume) of batteries for their exce
by jakeogh 9y ago
Rather unlikely that parent confused the two. Supercaps are nice if you don't mind trading their ~<1/5 energy density (mass, volume) of batteries for their excellent cycle count. Clearly not grid scale since batteries barely are.
- Dylan16807 9y ago1/5 takes quite a stretch, or comparing to especially low-density batteries. Maybe in a couple decades they'll be there, but my understanding is that high-end supercaps are currently 25x less energy dense than a lithium ion battery.
- jakeogh 9y ago~9Wh/kg for the best supercaps, compared to the old (and still standard) lead-acid maxing out around 42Wh/kg. Li-ion maxes out at amazing 265Wh/kg but they are always? small and scaled up by putting many in parallel... and if you damage one it's emergency fire preparedness time.
- Dylan16807 9y agoBut if you have just about any concern for density, you're not using lead-acid. Not when that's another 5x worse than other batteries. I'm willing to bet that most lead-acid users would happily switch to cheaper supercaps if they existed.
- jakeogh 9y agoAgreed. When supercap J/$ hits lead-acid levels the J/kg difference wont matter and most people using lead-acid will happily trade 1/4th the energy density for near infinite recharges.