The Home Battery ReportIndependent · No installer money

Tesla Powerwall 3 vs FranklinWH aPower 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 FranklinWH aPower 2: specs to scaleHorizontal bars comparing usable capacity, continuous power, peak power, warranty for Tesla Powerwall 3 and FranklinWH aPower 2, each scaled against the largest value in the home battery database.Tesla Powerwall 3FranklinWH aPower 2Usable capacity13.5 kWh15 kWhContinuous power11.5 kW10 kWPeak powerNot published15 kWWarranty10 yr15 yr
SpecTesla Powerwall 3FranklinWH aPower 2
ChemistryNot publishedLFP
Usable capacity13.5 kWh15 kWh
Continuous power11.5 kW10 kW
Peak powerNot published15 kW
Round-trip efficiency89%90%
Warranty10 years15 years or 60 MWh throughput, whichever comes first
Backup scopeWhole-home capableWhole-home capable
InverterIntegratedIntegrated

What actually differs

  • More usable capacity: the FranklinWH aPower 2 offers 15 kWh vs 13.5 kWh, so at that size it carries more of your home for longer per charge.
  • More continuous power: the Tesla Powerwall 3 sustains 11.5 kW vs 10 kW, which matters for running big loads like an AC at once.
  • Longer warranty term: the FranklinWH aPower 2 is warranted 15 years vs 10, though always read the throughput or cycle cap too.
  • 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 FranklinWH aPower 2 quotes 90% (grid to battery to load (AC round trip)), so do not read the raw numbers as a direct ranking.

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: FranklinWH aPower 2 datasheet, Dec 2025. Specs verified 2026-07-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.