Two years after Tesla first promised it, Cybertruck owners with a Powerwall 3 can now plug in and let their truck power the house. Software update 2026.27.10, which began rolling out on September 19, 2026, makes Vehicle-to-Home (V2H) official — and the numbers are worth reading twice: the Cybertruck's 123 kWh battery, combined with Powerwall 3's 13.5 kWh, delivers up to 11.5 kW into your home and keeps it running for over three days without the grid.
That's Tesla's own framing: "Powerwall 3 & I can now power your house together — this extends your home backup by over 3 days, equivalent to 9 additional Powerwalls." For anyone who has watched their lights flicker during a storm and glanced at a fully-charged 123 kWh truck sitting in the garage, that line hits differently.
How Vehicle-to-Home Actually Works
The setup is straightforward once you have the hardware. Your Cybertruck needs to be parked, plugged into a compatible Tesla Universal Wall Connector or Wall Connector 3, and have more charge than your configured discharge limit. When the grid drops, the Powerwall 3 takes over immediately — and the Cybertruck automatically begins supplementing it to extend runtime.
To enable it, go to Charging > Powershare on the touchscreen. The Powerwall 3 manages standard operations while the truck's battery fills in the gap. Previously, owners had to choose one or the other; now both work as a unified energy system.
| Component | Capacity / Output | Role |
|---|---|---|
| Cybertruck (Long Range) | 123 kWh | Extended backup reservoir |
| Powerwall 3 | 13.5 kWh | Primary home battery |
| Combined Powershare output | 11.5 kW continuous | Whole-home circuits |
| Estimated backup duration | 3+ days | Grid-independent operation |
Hardware installation — a Universal Wall Connector plus the Powershare Gateway — runs around $4,000 for most setups, though quotes vary based on electrical panel work. If you already own a Cybertruck, the V2H capability itself comes at no extra software cost.
A Promise Three Years in the Making
The timeline tells the story of how difficult this integration turned out to be. Tesla first committed to Powerwall compatibility in October 2024, targeting "sometime in 2025." By December 2025, the deadline had slipped to mid-2026. Software conflicts and utility regulatory requirements were the cited blockers.
The September 2026 launch covers Powerwall 3 only for now. Powerwall 2+ owners are waiting — Tesla confirmed that support is coming "later this year," though no specific date has been given. If you're on an older Powerwall, the V2H screen is visible in settings but won't activate yet.
"This extends your home backup by over 3 days, equivalent to 9 additional Powerwalls." — Tesla, via official update notes for 2026.27.10
FSD 14.3.10: The AI Compiler Overhaul
Update 2026.27.10 also ships FSD (Supervised) 14.3.10 for Hardware 4 vehicles, and the headline improvement is under the hood: Tesla rewrote the AI compiler and runtime from the ground up using MLIR (Multi-Level Intermediate Representation), the same compiler framework used by Google, NVIDIA, and Meta for machine learning workloads.
The result: 20% faster reaction time across the board. That improvement flows through every FSD function — lane changes, intersection handling, pedestrian tracking — without requiring drivers to retrain their habits or adjust settings. FSD 14.3.10 also brings a unified model across FSD, Actually Smart Summon, and Robotaxi, tightening consistency across modes.
Actually Smart Summon gets a speed bump too: max speed increases to 8 mph (13 km/h), up from earlier limits, making parking lot retrieval noticeably less glacial.
Hardware 3 Owners Finally Get Speed Profiles and Arrival Options
This update includes FSD 14.2 Lite for older HW3 vehicles (Model 3 and Model Y), bringing features that HW4 owners have had for months:
- Speed Profiles — including the new SLOTH mode, described officially as "lower speeds & more conservative lane selection than CHILL." It joins CHILL and STANDARD as a third option for those who prefer maximum comfort over efficiency on surface streets.
- Arrival Options — choose where FSD drops you: Parking Lot, Street, Driveway, or Pull Over. Preferences persist per destination.
- Parking, unparking, and reversing via FSD on HW3, a capability previously absent from the Lite build.
- Speed Profile adjustment via steering wheel — right scroll wheel up/down now adjusts Speed Profile instead of a speed offset, cleaning up a common driver confusion point.
HW3 owners with a 2021–2023 Model 3 or Model Y who haven't opted for a chip upgrade now have a meaningfully improved FSD experience without spending on hardware.
The Bottom Line for Tesla Owners
2026.27.10 is one of those updates that looks quiet on the changelog but lands differently once you use it. Cybertruck owners with Powerwall 3 are finally getting the whole-home energy system Tesla has been building toward — a truck that earns its keep even when parked. FSD 14.3.10's MLIR speedup is invisible until you notice that the system feels snappier in traffic. And SLOTH mode, while easy to dismiss as a novelty, fills a real gap for owners who found CHILL still too aggressive on their neighborhood streets.
The update is rolling out progressively. Check Software > Software Update on your touchscreen if it hasn't arrived yet.
Photo: Tesla energy and industrial / Pexels