Tesla Powerwall 2

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 It is now discontinued and superseded by the Powerwall 3, so it is only relevant on the used or existing installation market.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)

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.

Source: Tesla Powerwall 2 AC Datasheet, North America. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.