Elon Musk is officially against it because it could degrade the battery of electric cars too much.
Electric cars from Tesla as a power supplier for the network: The Model 3 and Model Y of the US manufacturer should be equipped so that the vehicles can not only charge their batteries with power from the network, but can also feed power into the network. Tesla is rather skeptical about connecting the electric car to the power grid (Vehicle to Grid, V2G).
Nevertheless, both vehicles are equipped with the necessary facilities for bidirectional charging, reports the US online news provider Electrek, which specializes in electromobility . This was determined by a technician from General Motors subsidiary Cruise Automation when dismantling a Model 3.
“When I reverse engineered the Model 3 charging system, I found that the design was completely bi-directional,” he said to Electrek. This means that current can be converted from alternating current (AC) to direct current (DC) to charge the battery, but also in the opposite direction from direct to alternating current. “This is called a DC / AC inverter, and if this technology is in a vehicle, it is called V2G (Vehicle to Grid).”
He found the bidirectional charging circuits on the charger’s circuit board three times, he said. This is redundant, so that the process is also ensured if one of the circuits fails. “It is also a three-phase design so it can be used worldwide.” The cruise employee suspects that the function can be activated via one of the updates to the vehicle software that are common at Tesla.
With V2G, electric cars could serve as short-term storage for the power grid. A car could be charged if a lot of wind power is available or if the network is less busy at night. If necessary, for example when there is a lull or during peak loads, it feeds electricity back into the grid. The South Korean automaker Nissan has some time ago a V2G project in Hagen started
However, Tesla is cautious. The fear is that bidirectional charging will overuse the battery and lose capacity.