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Fast electric car charger designed in France can send power to grid

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Credit: Renault

Where do we start with the issues this raises? Availability of the car for use by the owner/driver is an obvious one, fire hazards another. Inadequacy and weather-dependency of the future electricity grid is implied.
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A revolutionary charger for electric car batteries has been designed by Renault, which claims it is 30% more efficient than existing ones and allows energy to be put back into the grid at peak demand times, says Connexion France.

The bi-directional charger will be introduced to the company’s electric vehicles over the next decade, with the new electric R5 probably being the first model to be fitted with it.

Uses new materials to make it quicker

It has been developed in conjunction with French state-owned research body the Commissariat à l’énergie atomique et aux énergies alternatives with new electronic power converter architecture that took three years to develop and is protected by 11 patents.

Using new materials, it will be smaller than existing chargers and the 30% efficiency improvement will allow cars to be charged quicker and improve the lifespan of batteries.

In practical terms, it means a vehicle such as the Mégane E-Tech Electric would go from taking six-and-a-quarter hours to charge from a 7kW wall box fitted in a home garage to just over four hours.

Boost to electricity grids on cloudy days

At the moment, bi-directional connections to the grid from cars are still banned in France but the government has made changing the regulations to allow them one of its priorities.

The bi-directional facility will be particularly useful as the move towards renewable energy sources gathers pace, giving a boost to electricity grids on cloudy and windless days when power production will be low.

Energy taken at off-peak times, for example, could be stored in the car battery and then taken back into the grid at peak and more expensive energy times.

Changes to the materials used in the charger mean it will cost less than existing ones, Renault claims, although it did not specify by how much.

Maximum charging capacity will be 22kW using three-phase power.

Full article here.


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