this post was submitted on 27 Aug 2023
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It takes a 260kg flywheel with all its mass at the edge spinning at mach 0.5 to store 1kWh.
If you want simple supply chains, build a carnot battery. It'll be half as efficient, but far more compact (if graphite is the storage, more compact than LFP) and long lasting.
If you want a simple machine, buy a battery. The only hard part is high purity.