Tesla Powerwall 2 Specs
13.5 kWh usable · 5 kW continuous · 90% round-trip · 10-year warranty · lithium-ion
Specs verified against the manufacturer datasheet
Heads up: this model is effectively discontinued. We keep the page for reference, but see the verdict before buying one new.
The Powerwall 2 was a strong all in one AC battery with a solid 13.5 kWh usable capacity, integrated inverter, and whole home backup, but its 5 kW continuous output is modest by today's standards. It is now discontinued and superseded by the Powerwall 3, so it is only relevant on the used or existing installation market.
Specifications
- Chemistry
- lithium-ion
- Usable capacity
- 13.5 kWh
- Continuous power
- 5 kW
- Peak power
- 7 kW
- Round-trip efficiency
- 90%
- Depth of discharge
- Not published
- Warranty
- 10 year limited warranty
- Scalable to
- up to 10 units
- Backup scope
- Whole-home capable
- Inverter
- Integrated
- Weight
- 251.3 lb
- Dimensions
- 45.3 x 29.6 x 5.75 in (1150 x 753 x 147 mm)
- Operating temperature
- -20C to 50C (-4F to 122F), with performance de-rated below 10C (50F) or above 43C (109F)
Efficiency basis: AC to battery to AC round trip at beginning of life, measured at 25C and 3.3 kW charge and discharge power. Round-trip numbers are only comparable across brands when measured the same way, so read the basis before comparing.
Datasheet model numbers: 1092170-xx-y, 2012170-xx-y, 3012170-xx-y. Use the model number, not a retail listing title, when checking a used unit or a permit.
Source: Tesla Powerwall 2 AC Datasheet, North America. 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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