Tesla Powerwall 3 in Perth: Cost, Rebates & Installation Guide
The Tesla Powerwall 3 is a home battery that stores solar energy for use at night or during a blackout — it holds 13.5kWh per unit, delivers up to 10kW of continuous power, and includes a built-in solar inverter. Installed in Perth by an accredited local team, most single-unit installs cost in the range covered below once rebates are applied, and take about a day to complete.
This guide covers what you actually need to know before installing one: real costs, current rebates, how it compares to the Powerwall 2 and other batteries, whether your home qualifies, and what installation day looks like.
What Is the Tesla Powerwall 3?
The Powerwall 3 is Tesla’s third-generation home battery, released in Australia in 2024. Unlike the Powerwall 2, it has a built-in solar inverter — meaning it can convert and store solar power without needing a separate inverter, which simplifies installs on new solar systems and can reduce total system cost.
It’s rated for both indoor and outdoor installation, built to handle Perth’s summer heat without overheating, and rated to withstand flooding above two feet — worth checking against Tesla’s current published spec sheet, as these figures are periodically updated by Tesla.
Multiple units can be stacked together (up to four on one Backup Gateway) if a single 13.5kWh unit isn’t enough for your household.
| Usable capacity | 13.5 kWh per unit |
| Continuous power output | Up to 10kW |
| Inverter | Integrated (no separate inverter needed) |
| Installation location | Indoor or outdoor |
| Expandable | Up to 4 units per Backup Gateway |
| Works with existing solar | Yes |
How Much Does a Powerwall 3 Cost to Install in Perth?
There’s no single fixed price — it depends on your setup — but three things drive most of the variation between quotes:
- Number of units. Most Perth homes install one Powerwall 3, but larger households or those wanting multi-day blackout coverage sometimes add a second unit.
- Switchboard work. Older switchboards may need upgrading to safely integrate a Backup Gateway — this is usually identified at the site assessment, not discovered on install day.
- Existing solar or new system. Adding a Powerwall 3 to an existing solar system is a smaller job than installing solar and a battery together, and prices differently.
Because of this, a generic online price estimate is rarely accurate — the way to get a real number is a free site assessment, which is also when we check what rebates apply to your specific install.
Battery Rebates That Apply to Powerwall 3 Installs
Most Perth households installing a Powerwall 3 can reduce the upfront cost through the Federal Government’s battery rebate scheme, and WA-specific incentives may also apply depending on your circumstances and when you install.
Because rebate rules and amounts change, we check your eligibility as part of every quote rather than quoting a fixed number here. For the current detail on what’s available and how it’s calculated, see our Federal Battery Rebate in Perth guide.
Powerwall 3 vs Powerwall 2: What's Different?
| Powerwall 3 | Powerwall 2 | |
| Inverter | Built-in | Separate inverter required |
| Continuous power | Up to 10kW | Up to 5kW |
| Capacity | 13.5kWh | 13.5kWh |
| Best suited to | New solar installs, homes wanting higher continuous output | Legacy installs, homes with an existing compatible inverter |
In practice, most new installs we quote now are Powerwall 3 given the integrated inverter simplifies the system — but if you already have a Powerwall 2 or a specific reason to prefer it, we can advise during your site assessment.
Powerwall 3 vs Other Battery Brands We Install
The Powerwall 3 isn’t the only option, and it isn’t automatically the right one for every home. We also install and service Sigenergy and iStore battery systems, which can be a better fit depending on your budget, existing inverter, and whether brand-name recognition or price-per-kWh matters more to you.
If you’re still deciding between battery brands rather than set on a Powerwall specifically, our Best Solar Batteries in Perth guide compares the main options side by side.
Is My Home Suitable for a Powerwall 3?
Usually a straightforward install
- Switchboard is reasonably modern or already compliant
- You’ve got wall space in a garage, laundry, or on an exterior wall
- Existing solar (if any) uses a common inverter brand
- Your Western Power solar connection is already approved
We’ll look closer at the assessment
- Switchboard is older or has known compliance issues
- Limited indoor or outdoor wall/floor space
- Existing solar uses an older or less common inverter
- Your solar connection approval predates current battery rules
Falling into the second column just means we’ll flag it during your free site visit and quote around it — it’s rarely a reason a home can’t get a Powerwall 3 at all.
What Installation Day Involves
- Site assessment — we check your switchboard, roof, and existing solar (if any) and confirm scope and price.
- Fixed-price quote — itemised, with any applicable rebates already factored in.
- Installation — typically completed in a day by our accredited electricians, indoors or outdoors as suits your home.
- Commissioning and handover — the system is tested, connected to the Tesla app, and we walk you through monitoring and backup settings before we leave.
Frequently Asked Questions
How long does a Powerwall 3 installation take?
Most single-unit installs are completed in a day, including switchboard work and commissioning. Larger jobs (multiple units, switchboard upgrades) may take longer — this is confirmed at your site assessment.
Can I add a Powerwall 3 to my existing solar system?
Yes. This is one of our most common installs — we check inverter compatibility as part of the free site visit.
Do I need solar panels to install a Powerwall 3?
No — the built-in inverter means it can technically run standalone, though pairing it with solar is how most households get the most value from it.
What warranty comes with a Powerwall 3?
Tesla provides the manufacturer warranty on the unit itself; Solar2020 backs every install with local after-sales support across Perth.
How many Powerwall 3 units do I need?
Most households are well covered by one 13.5kWh unit for typical overnight use and blackout backup; larger households or those wanting extended backup sometimes add a second. We size this based on your actual usage during the site assessment rather than guessing.
Is the Powerwall 3 better than the Powerwall 2?
For most new installs, yes — mainly because the built-in inverter simplifies the system and it delivers double the continuous power output. See the comparison table above for the full breakdown.