Flywheel energy storage
These guys are serious: Concrete flywheel storage system for residential PV – pv magazine International
It has to be very precisely balanced. They don’t mention a system price yet.

Metaphorically, this idea won’t take off, literally though, it will.

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I like this one …

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If you have a wife, installing something like that in your shower might yield a few kWhs every morning before sunrise and evening after sunset… :sweat_smile:

This is fascinating!

Very cool idea! Spin up the flywheel when you have excess solar, harvest when you don’t.

In theory, how long would such a flywheel be able to spin if no power is harvested from it?

It talks about a frictionless sealed environment and perfectly balanced. A week? Two?