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Perth, Western Australia

Perth has the highest solar irradiance of any major Australian capital — 5.5 peak sun hours per day on average. Combined with Western Australia's high electricity tariffs, solar in Perth delivers some of the fastest payback periods in the country. If you're in Perth and don't have solar yet, you're leaving significant money on the table.

☀ Get My Free Perth Solar Estimate → How it works
$510
Average quarterly bill
5.5 hrs
Daily peak sun hours
$3,400+
Typical annual savings
5–6 yrs
Average payback period

How Much Can Solar Save You in Perth?

The average Perth household uses around 18–28 kWh per day and pays approximately 6c/kWh. At those rates, a properly sized solar system can eliminate 600–80% of your electricity bill — saving $3,400 or more per year.

But averages are misleading. A household that runs ducted air-conditioning will have very different savings to a household on a single-phase connection. That's why SolarBill reads your actual electricity bill — so your recommendation is based on your real usage, not a guess.

Most Common System Size in Perth
The most popular system size for Perth households is 13.3kW — large enough to cover most daytime usage while remaining cost-effective. Higher-usage households often benefit from a 13.3–16.6kW system.
Battery Storage in Perth
A 10kWh battery in Perth typically covers evening usage until around midnight. A 25.6kWh battery provides overnight coverage for most households. WA feed-in rates are relatively low, making self-consumption via battery more valuable than exporting.

Solar in Perth — What You Need to Know

Perth's hot, dry summers mean air-conditioning loads are significant — which actually aligns well with peak solar generation. The low feed-in tariff in WA (7.135c/kWh) means self-consuming as much solar as possible is critical. A larger system or battery will maximise your savings compared to a basic 6.6kW system.

STC Rebate for Perth
Perth sits in STC Zone 1. The STC rebate for a 10kW system in Perth is currently worth approximately $3,200–$4,000 depending on the current STC price — deducted from your installation cost upfront.
Peak Sun Hours in Perth
Perth receives an average of 5.5 peak sun hours per day annually. Summer peaks at around 6.3 hours and winter drops to around 4.3 hours. SolarBill uses your actual location for all calculations.

Get Your Personalised Perth Solar Recommendation

Upload your Perth electricity bill and SolarBill will calculate exactly what size system you need — based on your actual usage, your tariff, and Perth's solar data. Free, instant, no account needed.

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SolarBill covers all of Australia. Select your city for location-specific solar data and savings estimates.

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