Home battery · Tesla
Powerwall 3 + Expansion
Current model: Powerwall 3 · Powerwall 3 Expansion
Tesla's current integrated battery platform, with a lower-cost expansion option for added runtime.
Manufacturer specs, reviewed July 2026
13.5 kWhUsable energy
Up to 11.5 kWContinuous power
10 yearsManufacturer warranty
What it brings to the design
Tesla's current integrated battery platform, with a lower-cost expansion option for added runtime.
Powerwall 3 combines a 13.5 kWh home battery with an integrated solar inverter and system controls. Powerwall 3 Expansion adds another 13.5 kWh of stored energy without duplicating the inverter. Tesla supports systems with up to four Powerwall 3 units and up to three Expansion units, subject to the final design.
Your proposal names the exact model and setup we’ll install.
Published specifications
Powerwall 3 + Expansion at a glance.
Straight from the manufacturer’s spec sheet.
| Specification | Published value |
|---|---|
| Model | Powerwall 3 · Powerwall 3 Expansion |
| Usable energy | 13.5 kWh per unit |
| Continuous output | Up to 11.5 kW per Powerwall 3 |
| Solar input / architecture | Integrated inverter · 6 MPPTs · up to 20 kW DC input |
| Manufacturer warranty | 10 years |
Why homeowners consider it
Key strengths
- Integrated solar inverter with six MPPT inputs
- High continuous output for larger household loads
- Storm Watch and app-based energy monitoring
- Powerwall 3 Expansion adds capacity without another inverter
Often a fit for
Best suited for
- New solar-plus-storage projects
- Homeowners who want a unified Tesla energy experience
- Projects that need strong motor-starting and whole-home potential
Before we recommend it
What we’ll figure out with you
- Which loads should stay on during an outage?
- Is the project new solar, battery-only, or an expansion?
- How much stored energy is needed after sunset?
- Does the electrical layout support the preferred backup configuration?
It has to fit your whole system
Specs narrow the field. We also make sure it fits your roof, your electrical panel, your permit and your utility’s rules.
If a model ever has to change, we tell you before installation.