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Direct Solar Power: Off-Grid Without Batteries | How we can minimize expensive, ecologically damaging battery storage by changing how we think about energy (solar.lowtechmagazine.com)

submitted 2 years ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 2 years ago* (last edited 2 years ago)

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.