Powerwall 3 Expansion Pack

More Storage. More Savings. More Backup.

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Powerwall 3 Expansion Pack

Add More Energy Storage. Expand Your Independence.

Already have a Tesla Powerwall 3? The Powerwall Expansion Pack lets you add an extra 13.5 kWh of storage for even greater energy independence — without needing another inverter.

Each Powerwall 3 can connect with up to three expansion packs, increasing total capacity to 54 kWh. Perfect for larger homes, EV owners, or businesses that want to capture more of their solar energy and reduce reliance on the grid.

Why Add an Expansion Pack

More Storage, Less Spend
The Powerwall 3 Expansion Pack reuses your existing Powerwall inverter, saving thousands on hardware and installation.
Seamless Integration
Your Tesla app will treat the additional capacity as part of one unified system. There’s no extra monitoring app or complex setup required.
Fast and Clean Installation
Since the inverter is already in place, installation takes less time and requires minimal changes to your electrical system.
Rebates and Incentives Available
Eligible households can access government battery rebates, reducing upfront costs. For example, at $330 per kWh, you could receive up to $4,455 off your installation (based on 13.5 kWh).
Backed by Tesla’s 10-Year Warranty
Enjoy peace of mind knowing your investment is protected under Tesla’s leading 10-year product warranty.

How It Works

Assessment – We review your existing Powerwall 3 setup to ensure compatibility.
Installation – Certified Tesla installers add the Expansion Pack to your system.
Integration – The new capacity automatically links with your Powerwall and Tesla app.
Activation – Once commissioned, your system operates as one powerful, unified battery.

Is the Expansion Pack Right for You?

You may benefit if:

You regularly export excess solar back to the grid.
You’re planning joining a VPP such as Amber Electric
You own or plan to buy an electric vehicle.
You want longer backup during blackouts.
Your daily consumption exceeds 20 kWh.

SunStak’s energy geeks will model your solar production and load profile to calculate whether the upgrade will shorten your payback period and improve your energy independence.

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Tech Specs

Feature

Powerwall 3 Expansion Pack

Usable Capacity

13.5 kWh per unit

Compatibility

Tesla Powerwall 3 only

Max Units per Powerwall 3

3

Total Possible Storage

54 kWh (1 base + 3 expansions)

Warranty

10 years (Tesla Energy)

Installation

Wall or floor mounted

Backup Power

Supports grid-outage backup when connected to a Powerwall 3

Frequently Asked Questions

Can I add an Expansion Pack to Powerwall 2?

No. The Expansion Pack is only compatible with Tesla Powerwall 3.

How much extra storage will I get?

Each unit adds 13.5 kWh. You can add up to three per Powerwall 3.

Is a rebate available?

Yes, under the Federal Government Battery Rebate Program (Cheaper Batteries for Homes).

Does it affect my warranty?

No. The expansion pack carries its own 10-year Tesla warranty and does not void your existing coverage.

Can it be installed outdoors?

Yes. It’s highly weather-resistant (flood proof) and can be wall or floor-mounted.

How Much Rebates?

Each Powerwall 3 unit can support up to three expansion packs. Here’s what your system could look like with the federal government battery rebate:

  
    
        Expansion Packs
        Pack Capacity
        Total Capacity
        Rebate Calculation
        Total Federal Rebate
      

    
        1 Expansion Pack
        13.5 kWh
        27.0 kWh
        13.5 × $330
        $4,455
      

        2 Expansion Packs
        27.0 kWh
        40.5 kWh
        27 × $330
        $8,910
      

        3 Expansion Packs
        40.5 kWh
        54.0 kWh
        40.5 × $330
        $13,365
      

  

Battery Rebates Now Available

We will handle your rebates and compliance matters with the utmost professionalism and attention to detail.

Federal Government’s Battery Rebate Program (pending) provides around $330 per kWh for eligible households installing new battery storage capacity, including expansions.

✅ Rebates apply to new capacity added to existing systems

✅ Funding is reduced every year. Secure your rebate before it’s gone

Powerwall + Expansion pack brochure

Tesla App

Control It All in One App

Once installed, your expansion pack is fully integrated with your Tesla Mobile App—so you’ll see one system, one performance graph, and one clear picture of your home energy.

Instant booking with a Powerwall Geek

Select a time and date that fits with your schedule or contact us to discuss your project.

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