Based on: 25 kWh/day usage · 8 kW solar · 5 kWh battery · typical tariffs

Solar & Battery Savings in Perth & WA Get quotes from local installers

Design solar and battery systems for Western Australia using Photonik's professional design platform. Western Australia has 41% of households owning a solar energy system, surpassing the national average of 32%. The state offers feed-in tariffs through Synergy and Horizon Power, and investments in community battery programs support solar users by storing excess energy.

Solar Energy Savings in Western Australia

How Solar Reduces Your Electricity Bills

The calculations below show how your electricity bills change with solar.

Calculating...

Based on: 25 kWh/day usage · 8 kW solar · 5 kWh battery · typical tariffs

Adjust these amounts in the next section

Old Bill (Before Solar): Monthly: 181.0 | Annual: 2166.0

New Bill (With Solar): Monthly: 67.0 | Annual: 803.0

Monthly Savings: $ 114.0 | Annual: $1364.0 | Bill Savings: 63%

Monthly Savings

$ 114.0

Annual savings: $1364.0 | Bill Savings: 63%

What drives your savings in Western Australia

Western Australia operates outside the National Electricity Market, with Synergy providing a regulated export rate (DEBS) of around 10c/kWh for residential solar — higher than east-coast flat FiTs but still well below retail rates of 30–33c/kWh. Self-consumption remains the strongest savings driver. WA does not yet have widespread wholesale export access for residential customers, but community battery programs and emerging VPP schemes are expanding options for battery owners. Perth and inland WA enjoy excellent irradiance above 5 kWh/m²/day.

Your usage & system size Western Australia

Energy usage & tariffs

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.

Daily Energy Usage: 25 kWh (~$181.0/month)

5 kWh 100 kWh

Electricity Cost

$ /kWh

Sell Price (FiT)

$ /kWh

Self Use %

lightbulb Note: These are simplified estimates. For detailed tariff inputs and advanced calculations, use the full Photonik app.

Representative flat export rate (feed-in tariff). What you earn per kWh of surplus solar exported to the grid. Your actual rate depends on your provider, plan, and time of day.

See how export rates work →

Estimated at 75% of the retail grid rate. A battery lets you store daytime solar and export during expensive peak hours, so each exported kWh is typically worth more than a flat feed-in tariff. Real returns depend on your time-of-use tariff and battery efficiency.

See how export rates work →

Solar system size

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 9.9 kW system in Western Australia generates approximately 42.9 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.

Solar System Size: 8 (35 kWh/day)

1 kW 20 kW

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A 8 kW system in Western Australia can generate approximately 12661.0 kWh annually based on local sun conditions.

Battery storage

With solar-only (no battery), a 9.9 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.

Standard flat-rate feed-in tariffs have fallen below retail rates in most states, but homeowners with batteries can now access wholesale export pricing through certain retailers and virtual power plant schemes. During peak demand periods (typically 4–8pm), wholesale rates can reach 20–40c/kWh or higher — fundamentally changing battery payback compared to a fixed feed-in tariff. For accurate battery savings and ROI calculations specific to your state and retailer, use the full Photonik design tool.

Battery Size: 5 kWh

0 kWh 30 kWh

lightbulb A 0kWh battery will make you about 0% self sufficient.

The sweet spot for most households is 5 – 13 kWh — larger batteries add independence but with diminishing payback, especially where feed-in tariffs are low.

System Pricing & Payback for Western Australia

Use the full Photonik solar planning and design platform to model a complete system for your home — including detailed costs, equipment options, and financial returns.

Try Photonik Solar Design

For a quick price guide, see the Australia solar calculator.