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Gravity Storage 101 Or Why Pumped Hydro Is The Only Remotely Real Gravity Storage (cleantechnica.com)

submitted 7 months ago by silence7@slrpnk.net to c/energy@slrpnk.net

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[–] Ross_audio@lemmy.world 7 points 7 months ago* (last edited 7 months ago) (4 children)

Interestingly we've been through this energy storage journey with clocks before.

You can see old clocks which are gravity powered instead of energy stored in a spring.

Basically we've already learnt that unless we're using hydro, a massive amount of springs may be more useful than gravity. Especially given the space requirements of gravity powered systems

So springs?

What do clocks end up using today? Batteries.

Some with built in solar to charge their battery.

Battery storage is going to win out everywhere the environment isn't already ideal for a gravity system.

Even then you'll probably be able to store more power in a mountain by filling it with batteries than using pumped storage pretty soon.

[–] egonallanon@lemm.ee 3 points 7 months ago (3 children)

There are places and use cases where batteries aren't a great idea for energy storage and there are environmental concerns. I'm interested to see how mechanical flywheels progress for energy storage as while they lack the density and have higher upfront costs they have much lower maintenance costs and longer serve life.

[–] Ross_audio@lemmy.world 4 points 7 months ago (2 children)

Fly wheels are interesting.

Especially as the turbines we currently put steam through are essentially flywheels holding momentum for a short time after shutdown.

A flywheel that can turn for hours would be what's needed. Whether lots of small ones like this:

https://m.youtube.com/watch?v=_STnL0U9PyQ

Or a massive one.

Williams F1 even used a flywheel KERS system at one point. Batteries won there eventually too but if it can be genuinely useful in an F1 car it's certainly possible they could be useful when weight isn't a problem.

[–] egonallanon@lemm.ee 1 points 7 months ago (1 children)

Did Williams ever actually race the flywheel kers? I know it got used in WEC and some road applications.

[–] Ross_audio@lemmy.world 3 points 7 months ago

I don't think they raced it in the end. They sold it to Audi for endurance racing as you say.

Additional weight for occasional extra power wasn't worth it in the end.