Powerwall 3 and Powerwall 2 specifications
| Specification | Powerwall 3 | Powerwall 2 |
|---|---|---|
| Usable energy | 13.5 kWh | 13.5 kWh |
| Continuous on-grid power | 11.5 kW | 5 kW |
| Solar inverter | Integrated, six MPPT inputs | Separate inverter required |
| Dimensions | 43.5 x 24 x 7.6 in | 45.3 x 29.6 x 5.75 in |
| Published installed/product weight | 291.2 lb installed | 251.3 lb product |
| Warranty | 10 years | 10 years |
Powerwall 3 has a smaller face but is deeper and heavier. Its higher power output can support more simultaneous load with one battery, although the service size, breaker, backup design, and motor-start requirements still limit what a house can run.
The solar design is the larger difference
Powerwall 3 accepts direct DC solar input through an integrated inverter and six maximum-power-point trackers. It can also be added to existing solar in supported AC-coupled designs. Powerwall 2 is an AC-coupled battery, so existing panels keep their separate solar inverter.
For a new solar-plus-storage project, the integrated Powerwall 3 design can reduce separate wall equipment. For an existing array, the deciding details are inverter compatibility, backed-up solar limits, metering, utility approval, and whether the current inverter should stay.
Existing Powerwall 2 owners need a site-specific answer
Tesla's U.S. consumer support says Powerwall 3 cannot ordinarily be added to a Powerwall 2 or Powerwall+ system. Tesla also published a June 2026 service procedure for a limited replacement configuration involving Powerwall 2 and Powerwall 3 hardware. That exception is technician-facing and has gateway, metering, and power-control restrictions.
Do not assume a mixed-generation expansion will be approved from a product comparison alone. Give the installer the existing unit count, gateway model, meter hardware, solar inverter, utility interconnection agreement, and current one-line diagram.
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Product details, health guidance, and code references were checked against these sources.
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