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Flexible energy storage for your home

Tesla Powerwall 3 Expansion Pack Is Now Available!

Keep up with your home's growing energy demand with a scalable, cost-effective battery storage that works with your current Powerwall 3.

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Powerwall 3

Benefits of the Tesla Powerwall 3 Expansion Pack

Scalable energy storage

Easily expand your energy storage system over time, adding units as your household’s energy needs grow.

Cost-effective solution

Since expansion packs don’t include inverters, they offer a more affordable way to increase total storage without unnecessary hardware.

Reliable backup power

Single-phase backup during power outages keeps critical loads powered.

Peace of mind

Backed by Tesla’s 10-year warranty and designed for extreme temperatures, ensuring durability and performance in Australia’s climate.

What is a Tesla Powerwall 3 expansion pack?

Battery-only Design

The Powerwall 3 Expansion Pack is a battery-only unit designed to connect in parallel with a Powerwall 3 leader unit. Unlike the leader unit, it doesn’t include an integrated inverter or act as the system’s main connection point. It simply adds extra storage capacity. This design makes expansion packs a more affordable way to scale your system, especially for homeowners who want to gradually increase their energy storage as their home energy usage grows.

Expansion Options

Each Powerwall 3 leader unit can support up to three expansion packs, allowing homeowners to scale from 13.5 kWh to a total system capacity of 54 kWh. This flexibility allows you to start small and expand over time. It's ideal if you plan to add more electric appliances, switch to an electric vehicle, or simply want more backup power for your home.

Easy Installation

Tesla designed the Powerwall 3 Expansion Pack for flexible installation, allowing homeowners to maintain a clean and uniform look with their existing system. Expansion units can be mounted in a stacked configuration directly behind the leader unit for a compact setup, or arranged side-by-side in a horizontal line with the leader unit positioned at either end or in the middle. Due to the maximum cable length from the leader unit, all expansion packs must be installed within four metres.
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Powerwall 3
Cheaper Home Batteries Program

Save Big with the Federal Battery Rebate

The Tesla Powerwall 3 Expansion Pack qualifies for the federal battery rebate, giving homeowners a valuable opportunity to cut down on upfront costs when growing their energy storage system. Eligible households can access rebates of up to $17,500, equivalent to 50 kWh of usable capacity. These substantial savings make it easier to accelerate your journey toward energy independence, achieve a faster return on investment, and enjoy the peace of mind that comes with reliable backup power during outages.

Powerwall 3
Technical Specifcations

Powerwall 3 Expansion Pack Key Details

  • Usable Capacity: 13.5 kWh per expansion pack

  • Compatibility: Works exclusively with Tesla Powerwall 3

  • Operating Temperature: -20°C to 50°C

  • Installation: Wall-mounted or stackable; indoor/outdoor rated

  • Dimensions: 1,098 mm H x 609 mm W x 193 mm D

  • Weight: 130 kg

  • Warranty: 10 years

  • Expandable: Up to 3 expansion packs (max 54 kWh system)

Why Choose 1KOMMA5°:

High-Quality Products

1KOMMA5° works with the best products available to maximise output, reliability and longevity. We also provide customised solutions to suit your needs and budget.

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Industry-Leading Install Standards

All 1KOMMA5° installations are done by CEC accredited experts and come with full technical support and warranty service.

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Reliable Customer Support

Our support team is local (no call centres) and we have been awarded by the world's leading solar companies as the best installer in Australia, year after year.

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Tesla Powerwall 3 Expansion Pack FAQs

Can the expansion pack operate on its own?

No. The expansion pack is not a standalone battery. It must be connected to a Tesla Powerwall 3 leader unit, which contains the inverter and acts as the central hub for your solar and electrical system. The expansion pack is designed purely to add storage capacity and cannot function independently.

How many expansion packs can I add to a single Powerwall 3?

Each Powerwall 3 leader unit supports up to three expansion packs, giving you a maximum system size of 54 kWh of usable storage. This flexibility allows you to start with a single unit and scale up over time as your household energy usage grows—whether that’s from adding an electric vehicle, more appliances, or simply wanting greater backup coverage.

Do I need to upgrade my inverter to add an expansion pack?

No. Unlike other battery systems that require additional inverters when expanding, the Tesla Powerwall 3’s integrated inverter is designed to manage multiple expansion packs. This keeps costs lower and installation simpler, as no extra inverter hardware or rewiring is needed.

Can it work with Powerwall 2 or other battery systems?

No. The Tesla Powerwall 3 Expansion Pack is only compatible with the Powerwall 3 leader unit. It cannot be paired with a Powerwall 2 or third-party batteries. If you already own a Powerwall 2 and want more capacity, you would need to consider installing additional Powerwall 2 units instead, as expansion packs will not integrate with older systems.

Where can expansion packs be installed?

Expansion packs can be installed indoors or outdoors, and Tesla offers two main configurations: stacked directly behind the leader unit for a compact footprint, or side-by-side in a horizontal line with the leader positioned at either end or in the middle. To ensure proper connection, the expansion packs must be installed within four metres of the leader unit due to cable length limits. They are built with the same durable weather rating as the Powerwall 3, making them suitable for Australia’s tough climate.

Is the expansion pack covered by a warranty?

Yes. The Tesla Powerwall 3 Expansion Pack comes with the same 10-year warranty as the leader unit, guaranteeing reliability and performance over the long term. The warranty covers both product defects and performance degradation, ensuring your investment delivers consistent energy storage throughout its lifetime.