🇨🇦🇩🇪🇨🇳张殿李🇨🇳🇩🇪🇨🇦 on Nostr: Gravity batteries are awesome. I saw one that was basically just a train car on ...

Gravity batteries are awesome. I saw one that was basically just a train car on slanted tracks with cables that either used electricity to pull the car up (charging) or let the car slide down, powering a generator (discharging). It was kind of amazing: so simple and yet apparently rather efficient.

There's also one a few hours away from here that uses water and a dam to do the same kind of thing: pump the water up to charge, let the water out to discharge.