Tesla Powerwall 3 Expansion Pack
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The Tesla Powerwall 3 Expansion Pack is designed for homeowners who already own a Powerwall 3 and want to scale up their energy storage without the cost of adding another full unit.
More Storage Capacity: Each expansion unit adds 13.5 kWh of storage, providing more backup power during outages or for off-grid living.
Simple Integration: Expansion packs connect directly to an existing Powerwall 3 with no extra inverter required, making installation easier and more affordable.
Flexible Scaling: You can add up to three expansion units per Powerwall 3, tailoring the system to meet your household’s needs.
Installation Options: Choose between wall mount or stacking kits, including ground-mount configurations, depending on available space.
Compliance & Safety: Units are fully compliant with product safety standards, though homeowners should check local building codes before stacking.
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
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.
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F.A.Q
Frequently Asked Questions
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What size solar PV do I need for my off-grid?
You want as large a rooftop solar PV system as you can fit on your roof to reduce the amount of time you need to rely on your backup generator that may be required for periods during winter periods or times of low solar radiation (i.e. multiple cloudy days).
We generally recommend a minimum 10kW solar PV system, but the final size will depend on your anticipated load/demand. We can help you work this out by using our load profile sheet as part of our comprehensive quoting process.
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
Powerwall 3 Expansion Specifications
Configuration | Total Storage | Customer Need |
Powerwall 3 | 13.5 kWh | Small homes with lower energy needs. Power the basics like a coffee machine, TV, dishwasher, washing machine and A/C. |
Powerwall 3 +
| 27 kWh | Medium homes with growing energy needs. Powers the basics with capacity for higher energy appliances and electric vehicle charging. |
Powerwall 3 +
| 40.5 kWh | Large homes or high-energy lifestyles. Supports daily usage plus pool heating and pumps, with extra capacity to charge two electric vehicles. |
Powerwall 3 +
| 54 kWh | Extra-large homes or energy-intensive lifestyle. Supports the basics as well as extras like a home office, energy intensive activities and daily electric vehicle charging. |
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 |
