What is bidirectional charging and why do we need it?

For context, the problem to be solved is presented by the Grid system.

Demand and Supply

In order to work the Supply of Electricity must match the demand. However, demand varies over the day, with high demand between 16:00 and 19:00 and very low demand during the middle of the night.

Demand and Supply are changing

The charging of Electric cars will change the pattern of demand for Electricity, as will the move from Gas heating to Electric heating. What’s the best time for Home charging?

Supply has changed from consistent supply from centralised fossil fuels production to variable dispersed supply from Solar and Windpower.

Consequently, a very much more dynamic system is needed!

Can the National Grid cope with Electric cars?

Smart Charging

V1G

V1G – More commonly known as Smart charging, enables management of the time when EV charging occurs. But it doesn’t offer two-way powering.

Bidirectional charging

V2G

V2G charging will be more effective than smart charging. This is due to the ability to link EVs together and put significant levels of energy back into the grid at peak times, like a huge decentralised power station.

V2G will therefore help to reduce the grid’s need for additional energy generation, typically supplied by fossil fuels at peak times, as well as reducing demand on electricity networks, and allowing EV drivers to use greener and cheaper electricity.

THE FUTURE OF VEHICLE TO GRID EV CHARGING – Electric Nation – Seoptember 2020

CCS

The Combined Charging System (CCS) does not currently enable V2G, although the body promoting CCS, CharIN, has a roadmap for implementing Vehicle to Home (V2H) and then V2G into the CCS standard by 2025.

THE FUTURE OF VEHICLE TO GRID EV CHARGING – Electric Nation – Seoptember 2020

CHAdeMO

Currently, only Nissan Leafs using CHAdeMo have been able to offer V2G.

Hyundi / KIA

The KIA EV6 supports two-way (bidirectional) charging just like Hyundai’s Ioniq 5. The EV6 can put out up to 3.6kW of power.

KIA’S EV6 IS A SMALL ELECTRIC CAR WITH BIG DREAMSThe Verge – March 2021

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