Tesla's two best-selling cars can now keep the lights on at home during a blackout. On Oct. 6, Tesla said its Powershare Home Backup feature, until now limited to the Cybertruck, works with new Model 3 sedans and Model Y SUVs when they are plugged into a home that has a Powerwall 3 battery. Tesla says a fully charged Model 3 or Model Y can extend a home's backup time by more than two days.
The fine print matters. Tesla's Powershare page says every new Model 3 and Model Y ordered in the U.S. and Puerto Rico from Oct. 1, 2026 is capable of Powershare. Some, but not all, cars built before that date also have the hardware. Owners can check on the touchscreen under Software, then Additional Vehicle Info, where the car should read "Powershare Support: Enabled."
What you need to make it work
For the Model 3 and Model Y, Powershare home backup runs through a Powerwall 3 and either a Wall Connector or a Universal Wall Connector. Tesla says homes that already have a Powerwall and a Wall Connector need no additional equipment, and that compatibility is switched on by an over-the-air update. Teslarati reports the update arrives with software version 2026.38.3. Support for the older Powerwall 2 and Powerwall+ is listed as coming soon, with no date.
There is no Powerwall-free route for these two cars. The Powershare Gateway, which lets a Cybertruck feed a house without a Powerwall, is offered only for the Cybertruck, Electrek reports. Tesla also says its Powershare Grid Support program, which pays owners for sending energy back to the grid, is available for the Cybertruck in limited markets and not for the Model 3 or Model Y. The Model S and Model X are not part of the rollout.
Tesla Powershare home backup by model
| Vehicle | Home backup with Powerwall | Grid Support | Without Powerwall |
|---|---|---|---|
| Model 3 / Model Y (ordered from Oct. 1, 2026) | Adds more than 2 days | Not available | Not offered |
| Cybertruck | Adds more than 3 days | Limited markets | Powershare Gateway + Universal Wall Connector |
| Model S / Model X | Not supported | Not available | Not offered |
Tesla's estimates assume 30 kWh of household use per day and a full vehicle battery. Source: tesla.com/powershare, Oct. 7, 2026.
How much power, and for how long
Tesla lists maximum continuous output of 11.52 kW at 240 volts with a Powerwall. The bidirectional hardware in the Model 3 and Model Y is an inverter Tesla calls PCS2 Lite, certified under the UL1741 safety standard. The two-day estimate assumes a household using 30 kWh a day, which Tesla describes as the U.S. average, and Tesla says results will vary with energy use, solar equipment and the car's state of charge. Electrek and Drive Tesla Canada report that standard-range versions are rated for up to two days rather than more than two.
Tesla is late to this. Electrek points out that Ford's F-150 Lightning offered home backup at up to 9.6 kW when it launched in 2022. Tesla's own version arrived first on the Cybertruck and is now reaching the cars it sells in far bigger numbers.
What it means for owners and shoppers
For buyers who already have, or were planning, a Powerwall 3, this adds a backup battery at no extra hardware cost. Shoppers who want the feature should order a new car rather than buy one built earlier from inventory, unless the seller can show Powershare listed as enabled. Owners with a Powerwall 2 will have to wait for the promised update.
The simpler vehicle-to-load option has widened too. Using Tesla's Outlet Adapter, eligible cars can turn the charge port into a 120-volt outlet rated up to 20 amps, about 2.4 kW according to Drive Tesla Canada, for tools, camping gear or a space heater. Tesla says plugging devices in that way costs nothing beyond the electricity in the battery.
