Tesla Powerwall 3 Specs
13.5 kWh usable · 11.5 kW continuous · 89% round-trip · 10-year warranty
Specs verified against the manufacturer datasheet
An integrated solar inverter plus 13.5 kWh battery that has become the default whole-home pick; note its 89 percent figure is a solar round trip (solar to battery to home), not the AC to AC number rivals quote, and Tesla does not publish the cell chemistry.
Specifications
- Chemistry
- Not published
- Usable capacity
- 13.5 kWh
- Continuous power
- 11.5 kW
- Peak power
- Not published
- Round-trip efficiency
- 89%
- Depth of discharge
- Not published
- Warranty
- 10 years
- Scalable to
- up to 4 units for power; up to 3 expansion units (maximum 7 total units)
- Backup scope
- Whole-home capable
- Inverter
- Integrated
- Weight
- 291 lb
- Dimensions
- 43.5 x 24 x 7.6 in
Efficiency basis: solar round trip (solar to battery to home); not a pure AC to AC figure. Round-trip numbers are only comparable across brands when measured the same way, so read the basis before comparing.
Source: Tesla Powerwall 3 datasheet, 2026. Specs verified 2026-10-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.
Specs do not tell you if it pays off.
Payback depends on your rate plan, usable capacity, and local incentives, not the brand on the box.
Warranty terms, chemistry and round trip efficiency across the batteries we track are summarized in our home battery statistics.
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