In this article
This offer closed on 31 December 2023 and the prices that were on this page are three years out of date. It is kept as a record of what the promotion was, and because the way it worked out the cost is still the right way to compare any battery quote. Do not read a current price into anything below, because there are none.
In short
- Closed. A $750 Tesla rebate applied to Powerwalls installed between 11 August and 31 December 2023, claimed by January 2024. PSW matched it, making $1,500 off.
- The product it applied to was Powerwall 2, which is now legacy. Powerwall 3 replaced it.
- Every dollar figure this page used to carry has been removed rather than left to mislead. For a current price, ask for one.
- For the Tesla rebate that came later, see the Powerwall 3 rebate — and check its dates too, because it has its own window.
The part still worth keeping: cost per kilowatt-hour
The one durable idea on this page is how it compared batteries. Take the total investment — battery plus whatever inverter or control gear it needs to work — and divide by the usable storage in kilowatt-hours.
That single number is the only honest way to compare a battery quote, and it is the one most quotes avoid. It catches two things a headline price hides. First, usable capacity is not nameplate capacity: a battery advertised at 10 kWh may give you 9. Second, a DC-coupled battery is only a battery, and it needs a capable hybrid inverter to do anything — so a cheap battery beside an expensive inverter is not a cheap system.
Ask any installer for that figure, on the whole system rather than the box. If they will not calculate it, do it yourself: total price divided by usable kWh. Then compare.
What has changed since
Nearly everything. Powerwall 2 is retired and Powerwall 3 is the current product, with the inverter built in — which changes the cost-per-kWh sum, because you are no longer buying a separate one. Battery prices have moved, mostly down. And the rebate landscape is unrecognisable: there is now a federal battery programme and a Western Australian state scheme, neither of which existed when this page was written.
The result is that a 2023 comparison tells you nothing useful about a 2026 decision beyond the method. Use the method; ignore the numbers.
What we would say now
Most Perth homes should work out whether they need a battery before working out which one. A rebate makes a battery cheaper; it does not make a battery necessary. If your evening load is small because the house empties at eight and nobody is home until six, the payback is long whatever the discount.
Where a battery earns its keep is a different profile: heavy evening use, ducted aircon running past sunset, or a genuine dislike of losing power when the street goes down in a January storm. If that is you, the batteries we currently fit are the honest list, and a written price will be sized against your own bill.
Record: Tesla Powerwall rebate, $750, installations 11 August to 31 December 2023, claims by January 2024, matched by PSW Energy at the point of sale. Offer closed. Prices removed August 2026.