Solar panel system cost in Perth: October 2026 prices

Perth installers we checked advertise a 6.6 kW solar system, without a battery, from $3,199 to $7,190 in October 2026. Solar Choice’s October 2026 price index puts a standard Perth system at $5,030 for 6 kW and $5,470 for 7 kW, after the STC discount and including GST.

This is general information, not financial advice. Both sets of figures are starting points, not quotes, and your roof, switchboard and equipment choices move the price. Below we show where each number comes from, what the STC discount takes off a Perth system, what pushes a quote up, and what to check before you sign.

What Perth installers advertise for 6.6 kW

On 20 October 2026 we read the websites of 45 businesses listed in this directory. 7 publish package prices. 37 publish none and 1 site would not load. We copied the figures below as published and did not ask for quotes.

Business	Advertised 6.6 kW price, no battery	What the page says
Future Solar WA	$3,199	A banner reads “Switch to Solar for $3,199” and ends “terms and conditions apply”. No terms are shown, and no panels or inverter are named.
Solar 1 Nation Electricals	from $3,290	After federal and state rebates, for single-storey homes in Perth and Peel only. The page does not say which of its GoodWe, iStore or Fronius inverter options the price covers.
Urban Future	$3,800 to $4,800	Four packages of 15 panels (440 W each) with a 5 kW inverter, “fully installed”: iStore $3,800, Fronius $4,400, Sigenergy $4,600, Sungrow $4,800. Priced for a tin, single-storey, single-phase home. Tile adds $200 per 15 panels and a second storey adds $250.
Fritts Solar	$4,490 to $5,290	Marked “Limited Time Offer” with no end date. $4,490 with a “premium inverter”, $5,290 with a “premium European inverter”. Brands and sizes are not given. Fully installed.
Solargain	from $4,990	A Perth special with a battery-ready 5 kW iStore inverter. Final pricing “may vary” with location, roof and switchboard, and installation conditions apply.
Positive Energy Solutions	from $7,190	SunPower panels, after WA and federal rebates. Described as “a guide only”, for a single-storey tin roof with suitable switchboard space. The page says “Prices checked 1 October 2026”.

Read these as advertised starting prices. Most are “from” prices. Three of the six do not say whether the price is before or after STCs. A price on a web page is not a quote, and we have not tested any of these businesses. Being named here is not an endorsement.

A second reference: the Solar Choice price index

Solar Choice is a quote comparison service. Each month it publishes average installed prices from its installer network. Its October 2026 figures include the STC discount and GST, so they are the total retail price to the customer. These are the Perth rows.

System size	Standard offers	Premium offers
5 kW	$4,260	$5,300
6 kW	$5,030	$6,150
7 kW	$5,470	$6,770
10 kW	$8,240	$9,880

Solar Choice says its premium offers cost 20 to 30% more than standard ones because of the equipment. There is no 6.6 kW row, so a 6.6 kW system sits between the 6 kW and 7 kW figures. Source: Solar Choice Price Index, October 2026.

Five of the six businesses above advertise a 6.6 kW starting price below the index’s standard 6 kW figure. Positive Energy, at $7,190, sits above the premium 7 kW figure. The index averages what installers in one network quote. The advertised prices are starting points with conditions. Neither tells you what your roof will cost.

What the STC discount takes off a Perth system

STCs are small-scale technology certificates. Your installer creates them for you and takes their value off the price you pay. The number depends on the size of the system in kW, a zone rating for your postcode and a deeming period. The calculation is size multiplied by zone rating multiplied by deeming period.

The Clean Energy Regulator puts Perth postcodes 5800 to 6043 and 6045 to 6256 in zone 3, with a rating of 1.382. Postcode 6044 is zone 2, with a rating of 1.536. The deeming period is 5 years for systems installed in 2026. It falls by one year each year until 2030. The regulator reports that STC prices stayed close to $40 through the June quarter of 2026.

For a 6.6 kW system in zone 3, that works out as follows. These are our own calculations from the regulator’s figures, so use the regulator’s STC calculator for your address.

Installed in	Deeming period	STCs, about	Value at $40 each
2026	5 years	45	$1,800
2027	4 years	36	$1,440
2028	3 years	27	$1,080
2029	2 years	18	$720
2030	1 year	9	$360

The $40 is today’s price and nobody can promise it holds. What the table does show is the direction: for this system the discount drops by roughly $360 every January. The deeming period follows the year of installation, not the year you sign, so a December signature with a January install gets the lower figure.

Ask each installer whether the price is before or after STCs, and how many STCs they are claiming.

What moves a quote up or down

Roof and storeys. Tile roofs need tiles cut or ground to fit the brackets, according to energy.gov.au. Urban Future is the only business we found that publishes what this costs: $200 more per 15 panels for tile and $250 more for a second storey.

Switchboard. Older switchboards and meter boards sometimes need upgrading or replacing before solar goes on. energy.gov.au says the cost should be clearly stated in your quote.

Panels. Manufacturer “tiers” are based on a company’s finances, experience, scale and automation. The government says they do not measure the quality of the panels themselves. Ask for the model and its warranty instead. WA Consumer Protection says panel performance warranties can run up to 25 years, while material and workmanship warranties are generally 5 to 10 years.

Inverter. A 6.6 kW array with a 5 kW inverter is a common pairing, and energy.gov.au says it often makes good economic sense. If the array is larger than the inverter manufacturer allows, the system loses the STC discount. Inverters wear out sooner than panels: energy.gov.au lists 20 to 30 years for panels and 10 to 15 years for a string inverter.

Rules from 1 May 2026. From 1 May 2026, new or upgraded solar and battery systems on WA’s south west grid must support updated grid standards, according to Energy Policy WA (updated 4 August 2026). Ask your installer to confirm in writing that the quote meets them.

Adding a battery

Two rebates can apply, and both change with the date.

The federal Cheaper Home Batteries program works through STCs and is set to equal about a 30% discount on the upfront cost of a battery. The STC factor per kWh was 8.4 from January to April 2026 and is 6.8 from May to December 2026. It falls to 5.7 from January to June 2027 and 5.2 from July to December 2027. The battery must meet the program’s standards and be able to join a virtual power plant, and it must be installed by a Solar Accreditation Australia installer with a battery endorsement, according to the regulator’s battery page.

The WA Residential Battery Scheme offers Synergy customers up to $1,300 and Horizon Power customers up to $3,800. The WA Government said on 19 May 2026 that the scheme was still open for applications. Check its current status with Synergy or Horizon Power before you rely on it.

In our check, 6.6 kW packages with a battery were advertised from $11,920 (Plico Energy, 9.3 kWh with a 5 kW inverter) to $14,790 (Positive Energy, 15 kWh iStore). Both businesses say their prices are after rebates. At Positive Energy the same 6.6 kW system is advertised from $7,190 without a battery and from $14,090 with a 9.5 kWh Fronius battery, a difference of $6,900.

Reading a quote

Ask every installer for the same things, so you compare like with like.

• Whether the price is before or after STCs, and how many STCs are claimed.
• The panel and inverter models, the array size in kW and the inverter size in kW.
• The roof, storey, phase and switchboard assumptions behind the price, and anything priced as an extra.
• The deposit, the payment schedule and the installation date.
• The written warranty terms for panels, inverter and workmanship.

WA Consumer Protection generally recommends against a deposit of more than 10%. For contracts of $7,500 or more, the Home Building Contracts Act 1991 requires a written contract, a deposit of no more than 6.5%, and progress payments only for work done or materials supplied. If a retailer approaches you at home without an invitation, they must give you a 10 business day cooling-off period and cannot take money or start work before it ends. This comes from its solar panel systems factsheet, last updated 14 August 2024.

Only a licensed electrician can do the electrical work, and the contractor must lodge a Notice of Completion with your network operator. To claim STCs, the system must be installed by a qualified and accredited person, and the Clean Energy Regulator tells buyers to check that the installer is accredited by Solar Accreditation Australia. SAA has an accreditation status check on its site.

If you finance the system, an interest-free deal can charge interest on the remaining balance once the period ends, at rates as high as 29%, according to MoneySmart.

Ongoing costs

Most panels sit at a slope of at least 10 degrees, so rain should wash them. energy.gov.au says only a qualified person should clean them, because cleaning your own panels can be dangerous. It suggests a service every 2 years by an accredited installer or a qualified electrician.

Payback depends on how much of the power you use at home and what Synergy, the retailer for most Perth households, pays for the rest, so we do not quote a payback figure here. Synergy publishes its current buyback rates.

How we checked this page

We read each business’s own website on 20 October 2026 and copied the prices as published. The STC figures come from the Clean Energy Regulator, the price index from Solar Choice, and the consumer rules from WA Consumer Protection, each linked above. Every price and every STC figure on this page was last checked on 20 October 2026. The STC discount drops each January, so we will check them again in January 2027.

Rankings in this directory come from our published scoring method. Sponsored placements are labelled and never change a score.

Frequently asked questions

How much does a 6.6 kW solar system cost in Perth?

Installers we checked advertise it, without a battery, from $3,199 to $7,190 in October 2026. Solar Choice’s October 2026 index puts a standard Perth 6 kW system at $5,030 and a 7 kW system at $5,470, after the STC discount and including GST. Your roof and switchboard can change the price.

How much does the STC discount take off?

For a 6.6 kW system installed in Perth in 2026, our calculation from the Clean Energy Regulator’s figures gives about 45 certificates, worth about $1,800 at $40 each. The figure falls every January until 2030.

Does the WA Government give a rebate for solar panels?

The STC discount that comes off panel prices is a federal scheme. The WA Residential Battery Scheme is for batteries, with up to $1,300 for Synergy customers and up to $3,800 for Horizon Power customers.

Is a 5 kW inverter enough for a 6.6 kW solar array?

It is a common pairing, and energy.gov.au says it often makes good economic sense. The array must stay within the inverter manufacturer’s specification or the system loses the STC discount.