Gravity batteries are one of the most promising energy storages for green energy. But they also can produce energy.

Gravitation or gravity batteries are systems that store energy in kinetic form. The idea is simple. A winch pulls the heavy weight up. And then it will drop the weight down. The wight is connected to the generator. When it drops the generator will rotate. The system can benefit sensitively rotating rotor.

Rotor is connected to the sensitive rotating generator. When the weight drops and its movement ends, the clutch will release the rotor, which gets a couple of extra rotations. The system can install in any tower or crane on the Earth. That kind of gravitational battery is one of the simplest and most effective ways to store energy.

The idea is that green energy like solar power will use to pull the weight up in the daytime. And when that energy is needed the system can simply drop weight. That rotates the induction generator which also acts as the electric engine.

The system also can create electricity by using the hydraulic effect of water.

People can pull those weights up by using muscle forces. Or they can push up by using water pressure. These kinds of gravitational batteries can also offer the energy supply for people who live on coasts. Or the system also can deliver water to people.

In that kind of system, the water pushes the piston up. Then the ventilation closed. And water will conduct out from the tube. Then the system releases a piston that rotates the generator. And that thing offers a good way to create energy by using the hydraulic principle. The thing is that the piston must not be big. Many small pistons can offer the same abilities as one large weight.

Futuristic ideas about gravity batteries.

I don't know how practical these kinds of ideas are. But in some ideas, the yoyo is equipped with a generator. And that yoyo generator could load the mobile telephones.

There is an idea that this kind of gravitational battery can use for making electricity for small-scale solar power drones and drone boats. The idea is that the balloon that is connected to the dynamo pulls the weight up. And then the weight will drop. Or the weight that rotates the small dynamo in the small drone will drop below the drone. Very long nylon wire will put the generator rotate.

In some wild ideas, the tunnel will drill through the moon, and then, the weight will drop into that tunnel. That system will start to travel back and forth. And of course, there is a small power loss in the generator. The system can replace that power loss by using small solar panels that help the electric engine pull the weight back to the most up positions.

https://en.wikipedia.org/wiki/Gravity_battery

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