Solar and batteries in Thornlie: what the local data shows

Where Thornlie is

Thornlie is 14 km south-east of the Perth CBD. Postcode 6108 covers Thornlie: about 8,401 occupied homes and 23,665 people at the 2021 Census. Gosnells next door has more batteries for its size (71 per 1,000 homes against 57 here).

What stands out in Thornlie

• 21% of homes are rented, fewer than the 27% across Perth.
• 91% of homes are separate houses (78% across Perth), so most homes have a roof and switchboard of their own.
• 34 new solar systems per 1,000 homes in the last 12 months, 17% below the Perth rate: fewer roofs are still getting their first system.
• 33% of homes are owned outright, against 28% across Perth.

Batteries in Thornlie since the federal rebate began

475 batteries went in across the postcode from July 2025 to 31 August 2026, averaging 21.2 kWh, about the Perth average. Installs went from 21 in July 2025 to a high of 60 in March 2026, 1 month before Perth's busiest month (April 2026). About 1.0% of Perth's new batteries go in here, much the same as when the rebate began.

Batteries a month, Jul 2025 to Aug 2026. August 2026 is still being registered, so it reads low.

Thornlie's solar story since 2001

578 systems went in before 2011. Then came 2011, the postcode's busiest year (642), during the first rush of rooftop solar; the quietest since was 2015. 2025 brought 235, 37% of that peak. 33% of its 5,719 systems went in between 2011 and 2015, against 29% across Perth. Many were 2.1 kW systems now past ten years old, so adding a battery to existing solar, or replacing an early system, comes up often (see a battery for existing solar). Systems grew from an average of 2.1 kW in 2011 to 9 kW in the last 12 months.

Solar systems a year from 2011 (2026 to 31 August 2026); counts include replacements and small businesses.

Thornlie beside its neighbours

• Lynwood, 3 km north-west: more renters, with about as many batteries for its size.
• Maddington, 3 km east: fewer batteries for its size, less new solar in the past year, fewer separate houses and more renters, with batteries of a similar size.
• Gosnells, 5 km south-east: more batteries for its size, bigger batteries, more new solar in the past year and more renters, with a similar mix of homes.
• Cannington, 5 km north: more batteries for its size, bigger batteries, more new solar in the past year, fewer separate houses and more renters.

Prices, rebates and solar output

Each kW of panels here makes about 1,650 kWh a year, so a 9 kW system makes about 14,800 kWh. In STC zone 3, the federal rebates come to about $1,665 on 6.6 kW of solar and $3,663 on a 15 kWh battery (the battery rebate steps down on 1 January 2027). Prices follow the installer, not the suburb: Perth prices · WA rebates.

Getting a price in Thornlie

A vetted installer covers postcode 6108, and you meet one at a time (how we choose them).

Nearby: Lynwood · Maddington · Gosnells · Cannington · every suburb · Perth guide