Tesla Unlocks Powershare for Model 3 and Y—But Only if You Have a Powerwall 3

Tesla has officially turned its two highest-volume vehicles into rolling backup batteries for homes equipped with a Powerwall 3. The Powershare update pushes up to 11.52 kW of continuous power to a home during grid outages, bypassing the need for dedicated external backup hardware like those required by Ford or GM. Tesla estimates a standard trim starting at a 90 percent charge can supply a house using 30 kWh per day for roughly two days, while Cybertruck models can push past three. The bidirectional capability relies on an internal PCS2 Lite inverter and is currently restricted to Model 3 and Model Y units ordered in the U.S. or Puerto Rico on or after October 1, 2026. Texas owners cannot use these vehicles for Grid Support to sell electricity back during demand spikes, a feature that remains exclusive to the Cybertruck. "I don’t think very many people are going to want to use bidirectional charging, unless you have a Powerwall." — Elon Musk