Solar System Size in Perth (2026)
Perth's abundant, reliable sun lets a well-sized system meet a cooling-heavy load efficiently.
Your solar system size details
We estimate system size from typical household consumption per bill bracket.
Your estimate sits within the typical range.
Where the money goes
Estimated breakdown for your configuration
💰 Ways to save
- Size to your actual usage, oversizing wastes money, undersizing leaves savings on the table.
- Make sure the federal STC rebate is shown as an upfront discount in the quote.
or from $31/week over 5 years , indicative finance
How we estimate this
Solar in Australia in 2026 typically costs $900–$1,300 per kW installed after the federal rebate, so a 6.6kW system runs roughly $5,000–$8,000 and a 10kW system $9,000–$13,000.
Pricing reviewed: June 2026.
What a solar system size costs in Perth
Perth's long, sunny, dry summers deliver strong and consistent generation, so each panel earns its keep and a correctly sized system covers a large share of household use. The dominant single-storey home on a slab usually has a simple roof with good unshaded area, so the roof rarely limits the array, and sizing comes down to load rather than available space.
That load is cooling-dominated: hot summers drive daytime air-conditioning and evaporative cooling, which lines up with peak solar output, so a household running cooling hard through the day benefits from a larger system sized to that demand. Winter heating load is light in the Mediterranean climate, so the array need not be over-built for the cold months. Isolation can lengthen lead time on specific panels, but the sheer sun availability makes a generous Perth system pay off.
Compare against the national picture: Solar System Size in Australia →
Solar System Size in other cities
Frequently asked questions
What size solar system do I need?
It depends on your consumption. As a guide, a ~$500 quarterly bill suits a 6.6kW system; a $1,000+ bill may need 13kW. The calculator estimates this from your bill.
How much does solar cost in Australia?
About $900–$1,300 per kW installed after rebate in 2026, roughly $5,000–$8,000 for 6.6kW and $9,000–$13,000 for 10kW.
Is a solar battery worth it?
Batteries increase self-sufficiency and backup but roughly double the project cost. Payback depends on your usage pattern and any battery rebates.