The Home Battery ReportIndependent · No installer money

Tesla Powerwall 3 vs Tesla Powerwall 2

A straight, side by side read on specs and warranties, with the honest caveats. Every figure is from the manufacturer datasheet; sources are at the bottom.

Figure - Specs to scalebars vs the largest in our database
Tesla Powerwall 3 versus Tesla Powerwall 2: specs to scaleHorizontal bars comparing usable capacity, continuous power, peak power, warranty for Tesla Powerwall 3 and Tesla Powerwall 2, each scaled against the largest value in the home battery database.Tesla Powerwall 3Tesla Powerwall 2Usable capacity13.5 kWh13.5 kWhContinuous power11.5 kW5 kWPeak powerNot published7 kWWarranty10 yr10 yr

SpecTesla Powerwall 3Tesla Powerwall 2
ChemistryNot publishedlithium-ion
Usable capacity13.5 kWh13.5 kWh
Continuous power11.5 kW5 kW
Peak powerNot published7 kW
Round-trip efficiency89%90%
Warranty10 years10 year limited warranty
Backup scopeWhole-home capableWhole-home capable
InverterIntegratedIntegrated

What actually differs

  • More continuous power: the Tesla Powerwall 3 sustains 11.5 kW vs 5 kW, which matters for running big loads like an AC at once.
  • Efficiency is not apples to apples here: the Tesla Powerwall 3 quotes 89% (solar round trip (solar to battery to home), CEC weighted; not a pure AC to AC figure) and the Tesla Powerwall 2 quotes 90% (AC to battery to AC round trip at beginning of life, measured at 25C and 3.3 kW charge and discharge power), so do not read the raw numbers as a direct ranking.
  • Availability: the Tesla Powerwall 2 is effectively discontinued, so for a new install it is not a real option regardless of specs.

Which one pays off is a numbers question.

Neither spec sheet tells you the payback in your home. That comes from your rate plan and incentives.

Run the Worth It calculator →

Sources

Source: Tesla Powerwall 3 datasheet, 2026. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.

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.