Polestar has teamed up with energy suppliers and others for a large-scale vehicle-to-grid (V2G) project in its Swedish home city of Gothenburg, using its new electric SUV, the 3.
It is also working with the California Energy Commission and partners to investigate developing V2G systems in California.
V2G systems rely on bi-directional charging, which means electric cars can not only take energy from the local grid but give it back as well.
If it were implemented on a large enough scale, the vast energy storage capacity of thousands of EVs could play a major part in balancing energy through the grid by feeding it back in peak periods after storing it in off-peak periods.
EV owners who have solar systems can already reduce running costs by storing solar energy in the car’s battery during peak generation periods, rather than buying it from the network operator.
Bi-directional charging will also allow you to use energy stored in your car’s battery to run appliances in your house once the sun goes down. This is known as vehicle-to-home (V2H).
It will also be possible to charge your car from the grid in off-peak periods (like the early hours), then use that energy in the home during peak periods, when tariffs are at their highest.
Polestar is developing a virtual powerplant (VPP) to link cars to the grid via smart chargers. The VPP can see what the collective capacity of all connected cars is and initiate charging and discharging based on demand and battery optimisation.
Owners will ultimately be in control of the battery’s state of charge and be paid a tariff for the energy their cars export, in the same way that people can monetise their solar systems through export tariffs already.
Until now, bi-directional charging has been possible only on cars that use the Chademo charging system.
As such, the UK’s Electric Nation Vehicle to Grid trial, which was run by Western Power Distribution from March 2021 for one year, involved owners of Nissan Leafs with 30kWh batteries.
V2G wasn’t included in the original standard for the CCS charging system, which virtually all EVs now use.
To fix that, a standard called ISO 15118 is under development and expected to be fully signed off in 2025. So in theory, all CCS-equipped EVs from that date could be V2G-compatible.
It is this standard that Polestar is developing in conjunction with sibling brand Volvo (the 3 uses the same platform as the EX90).
Volkswagen is following a similar path and is also developing the standard to enable automated communication between its EVs and chargers.
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How much is the extra charge cycling, going to shorten the life of the car's batteries?
Theres an article on here today talking about how long EV batteries last and how to get the best out of them, I think there was something mentioned in there about your question.