A 13.5kWh battery with an 11.5kW solar inverter built in, so the panels plug straight into the Powerwall and there is no separate inverter to buy. Whole-home backup out of the box, Tesla app, installed by our own SAA-accredited electricians across Melbourne.
Powerwall 2 needed a separate solar inverter on the wall next to it. Powerwall 3 does not. It has its own 11.5kW solar inverter with six independent inputs, so up to six panel strings connect directly to the battery. One box does the solar conversion, the storage and the backup switching, and the Tesla app runs the lot. For a new solar and battery system that means fewer components, less wall space and one warranty.
It is also the simplest retrofit for a home that already has solar. Powerwall 3 accepts an existing inverter on the AC side, so the old system stays and the battery goes in alongside it. Where SigenStor wins on modular expansion, Powerwall wins on the ecosystem: if there is a Tesla in the driveway, the app already knows about it. System design is on the solar and battery page; this page is the Powerwall hardware.
Australian specification. Continuous output is capped by the distributor on single phase, which we confirm for your address.
Per unit. Expansion packs add 13.5kWh each.
Six MPPT inputs, up to 20kW of panels connected.
Enough to run ducted air con, oven and EV charger at once.
Battery and inverter, unlimited cycles for solar self-use.
Almost every Powerwall quote we write is one of these three. The right one depends on what is already on the roof and how much backup you want.
Panels wired directly into the Powerwall 3 inverter. No separate solar inverter, one box on the wall, whole-home backup on day one. The cleanest install for a home starting from scratch, and the one most of our Powerwall customers choose.
A Powerwall 3 with a DC expansion pack, 27kWh total. For big all-electric homes, ducted heating and cooling, a pool or two EVs. Up to three expansions fit on one Powerwall if you ever need 54kWh, without a second inverter.
Your current inverter and panels stay exactly as they are. Powerwall 3 connects on the AC side, stores the excess and backs up the house. If the old inverter is near end of life we can move the panels onto the Powerwall’s inverter at the same time.
Pricing depends on whether the solar is new or existing, expansion units, switchboard condition and phase. We quote against your bill with the battery rebates already applied.
The unit and the expansion pack side by side. The expansion pack is storage only and shares the Powerwall’s inverter.
| Spec | Powerwall 3 | Powerwall 3 Expansion |
|---|---|---|
| Usable capacity | 13.5kWh | 13.5kWh |
| Solar inverter | 11.5kW built in, 6 MPPT inputs | Uses the Powerwall inverter |
| Solar input | Up to 20kW DC connected | Not applicable |
| Continuous output | 10kW (Australian spec) | Adds capacity, not output |
| Backup | Whole-home, automatic, built-in switching | Extends backup duration |
| Existing solar | AC coupled, keeps current inverter | Not applicable |
| Battery chemistry | Lithium iron phosphate (LFP) | Lithium iron phosphate (LFP) |
| Expansion | Up to 3 expansion units, 54kWh total | Stacks beside the Powerwall |
| Ingress rating | IP67, flood resistant, outdoor mounting | IP67 |
| Monitoring | Tesla app, Storm Watch, vehicle integration | Tesla app |
| Warranty | 10 years | 10 years |
Tesla published figures at the time of writing. Continuous output on single-phase homes is set by your distributor’s export and inverter limits, which we confirm before quoting.
Tesla certifies installers for Powerwall, and our own electricians do every step. A Powerwall on its own is usually a one-day job, with new solar it is one to two.
Where the Powerwall can go (it is heavy and needs a solid wall or a pad), switchboard and phase, existing solar if any, and eligibility for the Solar Victoria solar rebate and the federal battery discount.
New solar or retrofit, expansion units if needed, backup scope and the number you actually pay with incentives taken off up front.
Powerwall mounted, panels wired direct or existing solar AC coupled, switchboard work done, whole-home backup wired. Tesla certified, SAA accredited, A-Grade, in-house.
Grid connection and export limit arranged with your distributor, Tesla app set up with your home and your car if you have one, certificate of electrical safety and warranty registration lodged.
Powerwall is a strong choice, not the only one. These are the systems we quote against it most often and when each one wins.
Modular stack in 8kWh steps with a DC EV charger option. Wins when you want to start small and grow, or want V2H.
Fronius GEN24 PlusAustrian hybrid inverter that takes a BYD battery later. Wins when the battery is a few years off and the budget is tight now.
Sungrow SBR batteryModular LFP battery with the Sungrow SH hybrid. Wins on cost per kWh for larger storage.
We install the heat pump, the induction cooktop and the EV charger the Powerwall will be running. That changes how we spec it.
If the gas is coming out, the evening load is going up. We size panels and storage for the house you are heading towards, and tell you when an expansion unit is worth it and when it is not.
Tesla warrants Powerwall only when a certified installer fits it. Ours are SAA accredited and A-Grade, on our payroll. The same crew comes back if you add an expansion later.
The federal Cheaper Home Batteries discount on the Powerwall, Solar Victoria rebate and STCs on new panels. Checked at inspection, applied on the quote, lodged by us.
Powerwall 3 can back up the whole home, but only if the switchboard is set up for it. We wire and test full-home backup as standard, including the loads that matter in a Melbourne winter.
Live Google reviews. Look for the Powerwall and battery jobs.
Anything else, call 0466 355 441. You will get an electrician, not a salesperson.
No. Powerwall 3 has an 11.5kW solar inverter built in with six independent inputs, so new panels connect directly to it. That is the main change from Powerwall 2, which needed a separate inverter on the wall.
Yes. It AC couples to your existing inverter, so nothing on the roof changes. If your inverter is old or undersized we can move the panels onto the Powerwall’s own inverter at the same time, which usually costs less than replacing the inverter separately.
It depends on whether the solar is new or existing, whether you add expansion units, and your switchboard and phase. We quote against your bill with the federal battery discount already taken off. Book the free site inspection and you will have a fixed number within a few days.
Yes, on most homes. It delivers 10kW continuous under the Australian specification, which covers ducted air conditioning, cooking and an EV charger together. Backup switching is built in, and we wire whole-home backup as standard.
A typical Melbourne home uses 15 to 25kWh a day, so 13.5kWh runs essentials overnight and much longer if the panels are producing during the day. Storm Watch in the Tesla app charges the battery to full ahead of forecast severe weather.
Powerwall if you want a single 13.5kWh unit, the Tesla app and a Tesla in the driveway. SigenStor if you want to start with 8kWh and grow, or want DC EV charging and vehicle-to-home from the same stack. Both are excellent and we install both, so the site inspection decides it, not a preference.
Yes. Powerwall 3 is on the approved product list for the federal Cheaper Home Batteries discount, and new panels qualify for the Solar Victoria rebate and STCs. We confirm eligibility at inspection and apply it all on the quote.
All of Melbourne, from the inner suburbs to the Mornington Peninsula. We are based in Somerville. See the locations page or call and we will confirm.
Your address, a recent bill and whether you already have solar. We will confirm the configuration, quote it installed and take the federal battery discount off before you see the number. No obligation.
