Tesla Is Now Making More EVs That Can Double As A Home Battery

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Tesla announced that its latest Model 3 and Model Y can supply power to homes when paired with a Powerwall 3, extending a capability already available on the Cybertruck. The setup uses power-conversion hardware in the vehicles and a standard Wall Connector, but requires a costly home battery and is not the same as routinely supplying power to the utility grid.

Tesla said Tuesday its latest Model 3 and Model Y electric vehicles can send power to a home when paired with a Powerwall 3, expanding a vehicle-to-home backup feature already offered on its Cybertruck. The approach uses power-conversion hardware built into the cars, avoiding the separate, costly bidirectional DC charger required by many competing systems.

The Model 3 and Model Y capability depends on a home having a Powerwall 3. Tesla says customers need only its standard Wall Connector charger as additional equipment to connect the vehicle for backup use. The Wall Connector retails for $595, according to Canary Media, while the Powerwall 3 is listed at $8,200 before installation costs, which can add several thousand dollars.

Tesla Energy residential business head Colby Hastings described the expansion as a way to make the company’s products work together. She said the company puts the conversion equipment in the vehicle rather than relying on a separate DC bidirectional charger installed at the home. Canary Media reported Tesla estimates the vehicle battery can add two to three days of backup power; actual duration will depend on household energy use and other conditions, which the report did not specify.

The Cybertruck has offered vehicle-to-home capability for more than a year, according to the report, and has a different setup: owners can buy a V2H hardware package listed at $1,990, with installation estimated at about $1,800 to $2,200. Canary Media compared Tesla’s equipment costs with the typical $6,500 to $10,000-or-more price for a DC bidirectional charger, excluding a home battery. These are reported prices, not a complete estimate of every customer’s total cost.

Lower-Cost Hardware, With a Powerwall Required

Putting conversion hardware in a vehicle could reduce the extra equipment a household needs to use an EV as backup power. That matters because the expense of bidirectional chargers and installation has limited interest in some programs, according to utility representatives cited by Canary Media. Tesla’s Model 3 and Model Y system may lower one barrier, but it does not remove the cost of buying and installing a Powerwall 3.

The broader potential is not limited to keeping an individual home powered during an outage. If large numbers of EVs can safely and reliably return energy, their batteries could contribute to electricity storage or help utilities manage demand. A study cited in the report estimated California could meet one-third of its grid-storage needs by tapping 10% of the 9.7 million EVs the state expects by the mid-2030s. That is a projection, not a measured outcome, and depends on participation, infrastructure and rules that let utilities access vehicle batteries.

The announcement also illustrates a trade-off: integrating power conversion into cars may cut the cost of separate home hardware, while adding complexity and expense to vehicle production. Whether other automakers adopt a similar architecture, and whether it becomes widely available across models and markets, remains uncertain.

How Tesla’s AC Backup Setup Works

Homes and the electricity grid use alternating current (AC), while EV batteries store energy as direct current (DC). A vehicle-to-home system must convert power between those forms. Most commercially available U.S. V2H systems described in the report use an external bidirectional charger to make that conversion; Tesla’s announced Model 3 and Model Y arrangement instead puts the relevant hardware in the vehicle.

Tesla is not the first automaker to offer EV-based home backup. The report says other manufacturers have offered systems using DC bidirectional chargers for years. Tesla’s distinction is the AC conversion architecture and its stated reliance on a standard Wall Connector alongside a Powerwall 3 for the new Model 3 and Model Y setup.

Home backup is different from vehicle-to-grid (V2G), in which electricity from a vehicle is sent back to a utility grid. California utility Pacific Gas & Electric has been testing V2H systems with several automakers using DC bidirectional chargers. The report says California and Maryland have established rules allowing AC bidirectional charging outside pilot projects, while other states are working on the issue.

“This is us bringing the whole ecosystem together and allowing our products to complement each other.”

— Colby Hastings, head of Tesla Energy’s residential energy business

Costs, Availability and Grid Access

The report does not give a full installed price for the new Model 3 and Model Y arrangement, confirm which exact model years or markets qualify, or specify when every eligible owner can use the feature. Tesla’s stated two-to-three-day backup estimate is not accompanied in the source material by assumptions about household consumption, weather, battery charge or other factors.

It is also unclear how broadly Tesla will make the capability available or whether other automakers will add comparable in-vehicle conversion systems. The announcement concerns home backup; it does not establish that Model 3 and Model Y owners can automatically sell power to utilities or participate in grid programs. Utility interconnection rules and program availability vary, and V2G remains a separate, more involved step.

Utility Testing and Customer Rollout

Tesla’s next practical steps are to make the feature available to eligible customers and show how the vehicle, Wall Connector and Powerwall 3 work together in real homes. The source report does not provide a rollout schedule or detailed eligibility terms.

On the grid side, Hastings said Tesla has enrolled Cybertrucks in programs with PG&E and Texas utilities CenterPoint Energy and Oncor. PG&E is also technically piloting interconnection of Tesla systems, according to Hastings. Those efforts concern access to utility programs and do not, by themselves, confirm that the newly announced Model 3 and Model Y setup is cleared for routine grid export. Further utility approvals, program details and customer costs will determine how far the system extends beyond backup power at home.

Key Questions

Which Tesla vehicles are included in the announcement?

Tesla said its latest Model 3 and Model Y can provide home backup when used with a Powerwall 3. The Cybertruck already had vehicle-to-home capability, according to the report.

Does the Model 3 or Model Y work as a home battery on its own?

No. The announced Model 3 and Model Y setup requires a Powerwall 3 in the home, along with a Tesla Wall Connector, according to Canary Media’s report.

Does this mean Tesla owners can sell electricity to the grid?

Not based on this announcement. Vehicle-to-home backup supplies a home, while vehicle-to-grid programs send energy to a utility. Grid participation requires separate technical and regulatory arrangements.

How much does the setup cost?

The report lists the Powerwall 3 at $8,200, the Wall Connector at $595, and several thousand dollars in Powerwall installation costs. It does not provide a complete installed price for the Model 3 and Model Y setup.

How long can a Tesla EV power a home?

Tesla’s reported estimate is two to three additional days of backup from the EV battery. The source does not give the household-use assumptions behind that estimate, so real backup time may vary.

Source: rss