Tesla Powerwall 2

Product history

Tesla Powerwall 2 was included in the recall notice “Tesla Recalls Powerwall 2 AC Battery Power Systems Due to Fire and Burn Hazards; Risk of Serious Injury or Death” on Nov 13, 2025 (recall date).

Tesla Powerwall 2 was included in the recall notice “Powerwall 2” on Sep 16, 2025 (recall date).

Published figures

No figures have been collected for units per system.

Usable and nominal energy

Nominal energy is the stated total stored energy. Usable energy is the stated amount available to draw.

Tesla Powerwall 2 states 13.5 kWh usable and 14 kWh nominal energy (96% usable).

Compare usable and nominal energy.

Stated temperature limits

Stated operating range: −4°F (−20°C) to 122°F (50°C).

Compare temperature limits.

After you enter a ZIP code, day counts describe outdoor air at the nearest station. A garage or indoor unit sees different air from the station. Output reductions inside the stated range are not counted.

Warranty terms

Compare warranties.

Features the manufacturer states

Configurations

Part numbers not named by these figures

• Powerwall 2 AC, part 1092170
• Powerwall 2 AC, part 2012170
• Powerwall 2 AC, part 3012170

Government and program lists

This product is on none of the lists this site reads.

Installs

Medians require at least 20 priced installs for the named measure and period.

• Connecticut records 1 install, approval year unavailable. Source: Connecticut Energy Storage Solutions — enrollment. No median battery cost per kWh: 1 priced install (approval year unavailable).

A count of installs says how many were installed, not how well they work. A median price is the middle reported price.

What Connecticut homes paid

All recorded installs were paired with solar PV.

All years includes 1 install with no recorded approval year.

Figures are medians. Parentheses give the middle half of prices. A dash means too few prices for a median.

Contract prices may include solar or other equipment. Prices are before the up-front incentive. Approvals run through Sep 29, 2026. Counts and prices are from the program’s Oct 1, 2026 release.

Compare recorded Connecticut prices.

Recalls and safety notices

• Nov 13, 2025, CPSC: Tesla Recalls Powerwall 2 AC Battery Power Systems Due to Fire and Burn Hazards; Risk of Serious Injury or Death

  CPSC, Nov 13, 2025:

  Hazard: The lithium-ion battery cells in certain Powerwall 2 systems can cause the unit to stop functioning during normal use, which can result in overheating and, in some cases, smoke or flame and can cause death or serious injury due to fire and burn hazards.

  Remedy: Consumers should ensure their Powerwall 2 system is online and check the Tesla App for a notification about whether their unit is included in the recall. Tesla has remotely discharged (or removed energy from the battery of) affected Powerwall 2 systems that are online, to prevent overheating, until the replacement is installed.

• Sep 16, 2025, ACCC: Powerwall 2

  ACCC, Sep 16, 2025. Notice summary:

  Hazard: Certain third-party lithium-ion battery cells in a subset of Powerwall 2 systems may fail and overheat. Reports of smoking or flames with minor property damage.

  Remedy: Free replacement. Tesla remotely discharges affected online units. Compensation for lost energy savings considered case by case.

• UL 9540 listed: Yes
  Spec sheet, at p.1 / COMPLIANCE INFORMATION, retrieved Sep 23, 2026, dated Jul 2, 2024 Not yet checked
• UL 9540A tested: Yes
  Spec sheet, at p.1 / COMPLIANCE INFORMATION, retrieved Sep 23, 2026, dated Jul 2, 2024 Not yet checked

The maker states the listing or test. The listing body's records have not been checked.

Backup hours from your load

The stated usable energy divided by your load gives hours, starting with a full battery.

The spec sheet states its usable energy at 25°C.

Continuous power: 5 kW (AC)

Peak power: 7 kW (AC)

Backup hours follow the California Air Resources Board’s Zero Emissions Residential Backup Power Tool. Appliance figures come from the US Department of Energy’s Estimating Appliance and Home Electronic Energy Use (2012).

• The appliance figures are nameplate maximums. Average demand changes as appliances cycle and their settings change.
• A load above the stated continuous power gets no figure.
• Motor starts use three times the largest selected motor’s watts, plus the other loads. This estimate is checked against stated peak power when available. Other loads are counted at their running watts.
• Inverter and battery losses are not counted. A field study of household backup power explains the gap.
• Solar recharge, reserves, and temperature changes are outside the calculation.