But no reverse charging at home with Tesla Model 3 – but possible on the Supercharger

The idea is so good that almost everyone liked to think that Tesla had actually implemented it when it was reported: The Model 3 should be equipped with technology for bidirectional charging from the factory, which is only waiting for software activation so that the electric cars if necessary, feed electricity into the network and thus make money like other stationary Tesla batteries, the blog Electrek reported. However, the technician on whose analysis the report was based has now corrected one crucial point.

Deceptive resemblance on Tesla board

“There you have it: Tesla’s cars currently do not support V2G,” says the moderator of the YouTube channel Transport Evolved in a recent video about the alleged power-in capability of Model 3, which is called Vehicle to Grid or V2G for short . And she is right, at least in so far as the expert, whose analysis Electrek relied on, said at about the same time in a commentary on another video that he had to withdraw the bidirectional charging statement.

After all, he had missed during his in-depth investigations that some components on the PCB of the Tesla charger look like many others like Mosfet transistors, but are not at all. Instead, they are diodes, as a closer look at the labeling in the video of the user Ingineerix reveals; this is also what Evolved’s explanatory film refers to. And from an electrical point of view, diodes are the exact opposite of bidirectionality because they only let current through in one direction.

The excitement about V2G from and with Tesla did not subside immediately. In response to both videos, some users said Ingineerix worked with a 2018 charger. That’s right, but the technician quoted by Electrek had a new one – and confirmed in his comment that he missed the diodes during his analysis. This would leave the possibility that Tesla has only prepared to recharge in even newer electric cars, but for now it is purely theoretical.

Electricity path on Tesla supercharger free

However, the discussion about the potentially significant innovation also revealed that the diode one-way street would only prevent the feeding of alternating current back into the grid via a home charging station – the path for direct current, on the other hand, is apparently already in with the model 3 examined both directions free.

On the one hand, this would allow electricity to be drawn from the Tesla battery for the general grid via an external inverter, which, however, means effort and cost. However, Tesla’s Superchargers already contain powerful inverters to convert AC power into battery DC, and these could be used in both directions. At least when charging on the Supercharger, Tesla could not only reduce the power, but also provide electricity when needed – if the drivers agree. At any given moment there are probably fewer Teslas on the Supercharger than at home at the charging station. But for this, supercharger technology could be used to extract significantly higher performance per car.

The amount of electricity Tesla is now dealing with on its superchargers worldwide is shown, at least indirectly, by a recently published graphic of the daily charging processes over time, including the slump in the corona crisis. Absolute figures are not available, but in China, for example, an increase of almost 100 percent within a year.


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