Tesla Powerwall 3 Expansion
Tesla Powerwall 3 Expansion home battery: 13.5 kWh usable, no inverter of its own. About $9,500 installed. Specs, surge, warranty and stacking.
All gear / Tesla Powerwall 3 Expansion
Tesla
More kilowatt-hours, no more kilowatts. It has no inverter, so it adds hours of backup, not the ability to run more at once.
Specifications
| Usable energy | 13.5 kWh |
|---|---|
| Continuous power | None (adds energy only) |
| Surge | Not published |
| Chemistry | LFP |
| Coupling | DC, behind a Powerwall 3 |
| Stacks up to | 3 units |
| Installed price | About $9,500 for the first, $9,500 each after |
| Warranty | 10 years, 70% capacity |
Source: Installer pricing, 2026. Photo: Rsparks3, CC0, via Wikimedia Commons.