Tesla’s Model 3 includes V2G capability…or does it?

Lately we’ve been hearing a lot of news about bidirectional charging, which supports vehicle-to-grid (V2G) applications and other nifty stuff. In January, Wallbox announced what appears to be the first bidirectional charger for the home market. Fermata Energy has several V2X projects in the works, including a partnership with Nissan. And ORNL recently demonstrated bidirectional wireless charging, using a UPS delivery van.

Oddly, EV trendsetter Tesla has been mostly silent about V2G and its relatives, perhaps because of concerns about battery degradation, or because the company has been more interested in pushing its Powerwall stationary storage products.

In a recent filing with the Texas electric utility commission, Tesla seemed to relegate V2G to the list of future projects, implying that EV adoption had not yet reached the necessary scale, and that vehicle owners might not buy in to the technology.

However, Tesla does have a history of building in future-oriented hardware features, and keeping mum about them until it’s ready to implement them. So it sounded plausible when Electrek reported that an electrical engineer had discovered an unannounced bidirectional charging capability in Model 3.

Marco Gaxiola reverse-engineered a Model 3’s onboard charger, and concluded that it is in fact bi-capable. “The design is fully bidirectional,” he told Electrek. “This means power can be converted from AC to DC…but also power can flow in reverse direction, coming from the battery and ending up on the AC side.” Mr. Gaxiola speculated that Tesla could enable Model 3’s V2G capability via an over-the-air software update.

Mr. Gaxiola was not actually the first to discover the supposed bidirectional circuitry. Viewers of EVTV may recall a similar revelation made by show host Jack Rickard back in December. After examining Model 3’s onboard charger hardware, Rickard said, “Now I’m not saying [Tesla is] going to do this without any changes to the hardware, but with enough time and a good compiler, I can make this thing take 400 V [DC] and put 240 V [AC] out the opposite end.”

(Bidirectional charging discussion begins around 16:30.)

Just as everyone was having such fun imagining the possibilities of a V2G-enabled Tesla (which are indeed intriguing), another electrical engineer, Phil Sadow (aka Ingineerix), challenged Gaxiola’s conclusions in a video. “I don’t believe that’s the case,” says Sadow. He has identified some components on the circuit board in question as diodes, which of course allow current to flow only in one direction. Electric Revs has spoken with Gaxiola, who now admits that he may have been mistaken.

So, does she or doesn’t she? Well, you pretty much have to be a power electronics engineer even to follow the arguments for and against. Presumably someone from Tesla will satisfy our curiosity sooner or later…

Sources: Electrek, EVTV, Electric Revs

  • jstack6

    another article said the parts were not what they thought and it doesn’t have V2G ability. So maybe YES maybe NO. We will see.

  • freedomev

    Most accurate article on this so far. Another EE found this a yr ago and likely the same charger will be in the S/X now or soon as no reason to have different models.
    The important parts is everything is built in , only costs about $50 more OEM and uses the simple L2, 240vac coupling unlike others so easy for home use or any 240vac outlet at work, etc.
    Since EVs will be the largest battery storage source in 12 yrs or so, the utilities desperately need them hooked up all the time, especially in the day.
    So utilities need to install millions of 240vac outlets for this. Plus they are the low cost installer, power supplier.
    I don’t think any other can do it for a profit motive as drives the kwh price too high and those doing it now will be bankrupt soon as their 10x cost charger scam becomes clear, dries up..
    Only utilities, Tesla, shopping centers who do it for costs or in utility’s case, cost plus 10%.

  • Jeff Nisewanger

    This report turns out not to be true.

    See ElectricRevs dot com for details.

  • Jeff Nisewanger