Tesla Powerwall 3 Expansion – Scalable Energy Storage for Greater Backup and Savings
Tesla Powerwall 3 enables 24/7 solar energy use, storing excess generation for use during peak electricity times or when the grid is down. With its integrated solar inverter and configurable operating modes, Powerwall 3 is engineered for efficient, future-ready expansion to extend backup coverage and reduce energy costs.
✅ Touch safe
✅ Easy system expansion
✅ Durable design
✅ Always connected
Key Features of Powerwall 3 Expansion
✔️ Modular Scalability – Add up to three expansion units to a single Powerwall 3 for a total of 54 kWh of storage
✔️ Quick Installation – Simplified setup with fewer components to reduce installation time
✔️ Plug-and-Play Integration – No additional interconnection wiring required
✔️ No Utility Approval Needed – Installation does not require DNSP (Distributed Network Service Provider) approval
✔️ Extended Backup Power – Increase your system’s ability to support appliances during outages
✔️ Boosted Savings – Store more solar energy for use during peak pricing, maximising self-consumption and lowering energy bills
Why Add a Powerwall 3 Expansion?
Powerwall 3 Expansion Packs are ideal for existing Powerwall 3 owners who want to extend their backup duration or increase usable storage, at a lower cost than adding a full second unit. Each expansion adds 13.5 kWh of additional storage capacity and integrates seamlessly with the main unit. You can install expansion packs at the time of your initial setup or add them later as your energy needs grow.
✅ Reduced installation time
✅ Extended outage protection
✅ Increased electricity bill savings
✅ Wall mounting kit or stacking kit available depending on system configuration
How It Works
Each Powerwall 3 can support up to three expansion units, increasing total system capacity from 13.5 kWh up to 54 kWh. The expansion packs are DC-coupled and controlled directly by the main unit’s built-in inverter. Essentially, these are simplified Powerwall 3 units without inverter electronics, designed specifically to expand storage at a lower cost and with minimal installation complexity.
Tesla plans to support multi-unit systems, with up to four Powerwall 3s, each connected to three expansion packs, reaching a potential capacity of 216 kWh. This functionality is expected later in 2025, making Powerwall 3 a truly scalable home or light-commercial energy storage solution.
Powerwall 3 Expansion Specifications
Battery Technical Specifications
| Model Number | 1807000-xx-y |
| Nominal Battery Energy | 13.5 kWh |
| Voltage Range | 52 - 92 V DC (Expansion units are connected in parallel and are not field serviceable.) |
Compliance Information
| Certifications | UL 1973, UL 9540 |
Environmental Specifications
| Operating Temperature | –20°C to 50°C (–4°F to 122°F) (Performance may be de-rated at operating temperatures above 40°C (104°F).) |
| Operating Humidity (RH) | Up to 100%, condensing |
| Storage Temperature | –20°C to 30°C (–4°F to 86°F), up to 95% RH, non-condensing, State of Energy (SOE): 25% initial |
| Maximum Elevation | 3000 m (9843 ft) |
| Environment | Indoor and outdoor rated |
| Enclosure Rating | NEMA 3R |
| Ingress Rating | IP67 |
| Pollution Rating | PD3 |
Mechanical Specifications
| Dimensions | 43.5 x 24 x 6.6 in (1105 x 609 x 168 mm) (These dimensions include the glass front cover being installed on the Expansion unit.) |
| Total Weight of Wall-Mounted Unit (includes cover and bracket) | 261.2 lb (118.5 kg) |
| Weight of Powerwall 3 Expansion (no cover or bracket) | 242.5 lb (110 kg) |
| Weight of Glass Front Cover | 14.5 lb (6.5 kg) |
| Weight of Wall Bracket | 4.2 lb (1.9 kg) |
| Weight of Expansion Harness | 2 lb (0.9 kg) |
| Weight of Expansion Unit Accessories | 1.5 lb (0.7 kg) |
| Mounting Options | Floor or wall mount |
| Stacking Capability (Floor Mount Only) | Up to (3) Expansion units behind a Powerwall 3 |
| Compatibility with Other Systems | Only compatible with Powerwall 3 |
| Connection to Powerwall 3 or Expansions | Expansion Harness (The Expansion Harness is a listed component of the UL 9540 certification.) |
| Warranty | 10-year standard Tesla warranty |
Availability in Australia
Powerwall 3 Expansion Packs are expected to be available in Australia soon. Stay tuned or contact us to register your interest and be among the first to access expanded energy storage when they arrive.
