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Cake day: March 31st, 2025

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  • it’s a flow battery, so it keeps charge basically indefinitely (when not in use energy-bearing parts are separated). you can run it as hard as you need and it will not degrade in use-dependent way, at least not as hard as lead or lithium batteries

    to elaborate on durability, there’s no capacity loss with these batteries. so if design intention is to run these batteries from full to empty and back every day, and maybe a bit more* they can handle it no problem, because everything that happens, happens in liquid phase that can’t degrade. lithium battery will degrade fast with such usage, but this one won’t. on balance, there’s need for pump and electrolyser maintenance, but at least you won’t need to rip apart everything and replace all batteries every 3 years. per kwh per year of use it might be cheaper this way

    * they might want this battery to provide energy in the morning, before solar panels kick in, soak up excess energy from noon peak, then discharge it in the evening. that might be 500ish cycles per year, and they can run it at full tilt










  • But anyways - why is there a vacuum in the jar? To preserve the jam? Isn’t jam a preserve? Like, I thought the whole raison d’etre of jam was as a way to make fruit keep, unrefrigerated, through the winter? Why must we preserve the preserve? Quis custodiet ipsos custodes?

    this is “fucking magnets, how do they work” translated to rationalist, except that explaining magnets involves quantum mechanics and explaining jam jars involves high school physics (saturated vapor pressure vs temperature. that might be before high school). i also like how one linked explanation sits near two pieces of slop and is wrong