Battery guide · Prices and sizing
Solar battery prices and sizing in Perth
What a home battery costs in Perth, what size suits your usage, and what you actually pay after the WA rebate. Then get matched with installers for a real quote.
What a battery costs, by size
Indicative installed price by usable capacity, before and after the WA rebate
| Battery size | Installed price | After the WA rebate |
|---|---|---|
| 10–15 kWhSmaller home | $8,700–$13,000full range $6,300–$19,000 | $7,400–$11,700eligible Synergy homes |
| 20–30 kWhMedium home | $17,300–$26,000full range $12,700–$38,000 | $16,000–$24,700eligible Synergy homes |
| 30–40 kWhBig home | $26,000–$34,600full range $19,000–$50,600 | $24,700–$33,300eligible Synergy homes |
| 40+ kWhVery big home | from $34,600low end from $25,300 | from $33,300eligible Synergy homes |
- WA Battery Scheme
- Up to $1,300
- $130 per kWh on the first 10 kWh. Synergy customers. Every size above gets the full amount.
- Includes
- Federal rebate
- Already taken off the installed price
How to read this
These prices are indicative. Two Perth homes wanting the same size can pay thousands of dollars apart once the inverter, switchboard, backup wiring and install work are counted.
They get you oriented. Only an installer who has seen your roof, board and usage can give a real price. That's what the match at the end is for.
On this page4 sections
How these prices are built
Solar Choice · benchmark 1 Sept 2026Each size is multiplied by a national price per kWh. Then the WA rebate is taken off.
- Source
- Solar Choice, national benchmark, 1 Sept 2026
- Price per kWh
- $633–$1,265 installed, median about $865
- Includes
- The federal battery rebate
- Excludes
- State rebates. The “after the WA rebate” price takes off the WA Battery Scheme.
- More detail
- The WA battery price index has the full dated series, with hardware and list prices kept separate.
Indicative only
Get a real price for your home
- A matched installer quotes your actual roof, switchboard and battery.
- Independent. Installers pay us a flat referral fee, never a percentage of your price.
- So the shortlist isn't skewed by who pays most.
What size do you need?
Size your battery to your evening and overnight use, not your whole bill. Your panels cover daytime use directly.
- Smaller home · 10–15 kWh
- Medium home · 20–30 kWh
- Big home · 30–40 kWh
- Very big home · 40+ kWh
- Aim for
- The size that just covers your evening peak on a normal day
- Too big
- You pay for capacity you never use
- Too small
- You buy peak-rate grid power after the battery runs out
- Go smaller if
- You use little power in the evening
- Go bigger if
- You have high use, an EV, or want whole-home backup. Only the first 10 kWh gets the WA rebate, but a bigger battery can still make sense.
The rebates that change the price
WA policy source · verified 31 Jan 2026Two schemes lower the price. The table at the top already applies both.
| Detail | WA Battery Scheme | Federal battery rebate (STCs) |
|---|---|---|
| Based on | Usable kWh, for eligible Synergy households | Your battery's capacity |
| How much | $130 per kWh, up to $1,300 | Grows with your battery's capacity, and steps down on a schedule |
| How you get it | Comes off on top of the federal rebate | Your installer takes it off upfront, when you buy |
To qualify
Questions that surface the real cost
What moves the price between quotes. Tick these off as you talk to installers.
| What | What changes the price | Keep in mind |
|---|---|---|
| The battery itself | Usable kWh, chemistry, brand, warranty, and all-in-one or modular, even at the same size | A cheaper battery with a weaker warranty isn't always the better buy |
| Your inverter and existing setup | If your solar inverter isn't battery-ready, you may need a hybrid or separate battery inverter. That changes the total a lot. | Adding a battery to existing solar can mean more work than installing both together |
| Installation | Switchboard condition, cable runs, single or three-phase power, and where the battery can legally go | A modern board near the meter is cheaper than one needing an upgrade and long cables |
| Backup wiring | Powering selected circuits in a blackout adds parts and labour | It's a design decision, not an afterthought. Plan it early if blackout protection matters to you. |
Ask every installer
4 questionsReady for a price that fits your home?
Want to take the next step?
Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.