Solar and batteries in Secret Harbour: what the local data shows

Where Secret Harbour is

Secret Harbour is 51 km south of the Perth CBD. Postcode 6173 covers Secret Harbour: about 3,872 occupied homes and 12,474 people at the 2021 Census. Baldivis next door has more batteries for its size (115 per 1,000 homes against 84 here).

What stands out in Secret Harbour

• 18% of homes are owned outright, against 28% across Perth.
• Larger households: 3.1 people on average (2.6 across Perth), which usually means more power used in the evening.
• 20% of homes are rented, fewer than the 27% across Perth.
• On the edge of the city, 51 km south of the CBD.

Batteries in Secret Harbour since the federal rebate began

326 batteries went in across the postcode from July 2025 to 31 August 2026, averaging 19 kWh (smaller than the Perth average of 21.8 kWh). Installs went from 14 in July 2025 to a high of 38 in April 2026, the same month as Perth as a whole. Its share of Perth's new batteries eased from 0.7% in the second half of 2025 to 0.6% in 2026, as other suburbs caught up.

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

Secret Harbour's solar story since 2001

144 systems went in before 2011. The busiest year was 2021 (345), in the second wave of rooftop solar, and the quietest since 2011 was 2013. 2025 brought 164, 48% of that peak. Systems grew from an average of 2.3 kW in 2011 to 9.5 kW in the last 12 months.

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

Secret Harbour beside its neighbours

• Port Kennedy, 3 km north: less new solar in the past year and more renters, with about as many batteries for its size.
• Warnbro, 8 km north: fewer batteries for its size, less new solar in the past year and more renters, with batteries of a similar size.
• Baldivis, 11 km north-east: more batteries for its size, more new solar in the past year and more renters, with batteries of a similar size.
• Rockingham, 14 km north: fewer batteries for its size, less new solar in the past year, fewer separate houses and more renters, with batteries of a similar size.

Prices, rebates and solar output

Each kW of panels here makes about 1,700 kWh a year, so a 9.5 kW system makes about 16,050 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 Secret Harbour

A vetted installer covers postcode 6173, and you meet one at a time (how we choose them).

Nearby: Port Kennedy · Warnbro · Baldivis · Rockingham · every suburb · Perth guide