Solar & Battery Rebates in Western Australia, Australia Incentives & Costs

Energy Usage

Energy consumption patterns in Western Australia reflect the state's diverse climate, from Mediterranean in the south-west to arid in the interior, with varying heating and cooling needs. The average Western Australian household uses between 20-30 kWh per day, with Perth properties typically consuming more during hot summers for air conditioning. Energy-efficient properties throughout Western Australia often use significantly less through modern insulation, efficient heating and cooling systems, and smart home technologies.

Before installing solar, consider reducing your energy consumption through improved insulation and energy-efficient appliances. This is particularly valuable in Western Australia, where the state's high solar adoption rate (41% of households) reflects excellent conditions for solar investment, and reducing consumption can lower the required system size and improve returns.

Note: Actual usage varies depending on property size, building efficiency, climate, and appliances.

Solar System Sizing

You'll need around 6.6kW of solar to match your average consumption in Western Australia. We recommend sizing between 9.9kW and 13.2kW for optimal results, accounting for daily and seasonal variations. Western Australia enjoys excellent solar potential, with Perth averaging around 4.5-5.0 kWh/kW/day annually, amongst the highest in Australia, with consistent generation throughout most of the year.

A 6.6 kW system in Western Australia generates approximately 28.6 kWh daily on average, with seasonal variation from 3.53 kWh/kW/day in June to 4.83 kWh/kW/day in February. Western Australia's exceptional solar irradiance, combined with the state's high solar adoption rate and competitive installation costs, makes solar particularly attractive for homeowners across the state.

With solar-only (no battery), a 6.6 kW system provides approximately 50% self-usage in Western Australia, depending on your consumption patterns, drawing 50% from the grid. Adding a 10 kWh battery increases energy independence to approximately 86% annually, reducing grid reliance to 14%. Battery storage is valuable in Western Australia, allowing you to store excess daytime generation for evening use and maximising the value of your solar investment, especially with the state's community battery programs.

Feed-in tariffs in Western Australia are available through Synergy and Horizon Power, typically ranging from 3-7 cents per kWh. The federal Cheaper Home Batteries Program (from July 2025) provides around 30% discount on battery installations. Western Australia's investments in community battery programs support solar users by storing excess energy. For accurate battery savings and ROI calculations specific to your location and retailer, use the full Photonik design tool.

Understanding Solar & Battery System Costs

A 6.6 kW solar system in Western Australia costs approximately $7,661, while adding a 10 kWh battery increases the total to around $12,904. Western Australia benefits from competitive installation costs, with Perth and regional areas offering excellent installer coverage and competitive pricing. Solar-only systems typically pay for themselves in around 5.1 years in Western Australia, whilst adding battery storage usually extends payback but significantly improves energy independence. The federal STC rebate reduces upfront costs by 25-30%, and Western Australia's excellent solar generation and high adoption rate mean many systems achieve payback in under 4-5 years.

The cost breakdown shows estimates for equipment costs, installation labour, and GST. Adjust system size and battery storage to see how it affects total investment and payback periods. Western Australia has excellent installer coverage, with Clean Energy Council (CEC) accredited installers operating throughout Perth and regional areas, providing competitive pricing and quality installations.