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Solar electricity storage

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Difficulty (?)
Duration (?)2h 0 min.
Cost (?)~15 CHF
Languagefrançais english
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Unlike most energy sources, once electricity is produced it is difficult to store it. Until now, the most efficient way to store large amounts of electricity has been to pump water up into mountain dams. Electricity can then be regenerated by sending the water down through pipelines at high speed to operate a turbine coupled to an electric generator.

With the development of new renewable energies, the question of storage has become even more crucial. Indeed, energies such as sun or wind are by nature intermittent and production is often not in phase with consumption needs. It is therefore necessary to develop efficient storage solutions to better match supply and demand; especially in regions without mountains and therefore without 'pumped storage' possibilities.

This project is inspired by an solution developed in Switzerland which stotes electricity based on a simple principle. The Swiss prototype lifts concrete blocks using an electric motor placed on a crane. To restore the energy stored, the blocks are lowered, this time using the electric motor as a generator. The designers claim to be able to 'give back' ~90% of the received electricity, which is even more efficient (return rate) than the 'pumping-turbine process used in hydroelectric plants (~80%).

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Drill the board at the 6 locations indicated on the model (pdf file under Blueprints&plans)
Make a large hole in the center of the foam square. Insert the motor and the foam square between ...
About 5mm from both ends of the aluminum profile, drill holes with a 3mm metal bit.
According to the diagram, fix the aluminium profile between the two brackets with a screw and a ...
Fix the construction on the board with 4 wood screws.
Slip the fixed gears onto the axles, leaving 2cm of the axle protruding.    From the other end ...
Cut two 3cm diameter discs from cardboard or thin plastic and punch the center with an awl.   ...
Attach two connectors to the two rear axles as shown.    Attach the coil to the connector on t ...
Strip and twist the motor and diode wires together to create red+black pairs.   Fix a crimp on ...
Attach two other crimps to one end of the electrical cable and slide them under the washers on t ...
Build a hook with the large electrical wire.   Put two nuts on a screw and pass it through the ...
Attach the pulley about 1-2 meters from the ground.    Place the base of the model on the grou ...

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