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Detailed reviews and information of the best solar panels, inverters and batteries. Plus hybrid and off-grid solar system reviews and information articles on how solar and battery systems work.

Solar Power Installers | Perth WA

Home > Perth WA

Solar Power in Perth

Solar Generation

A solar panel system in Perth, which is installed with good access to the sun, can get up to a massive 5.88 kWh of solar energy per kW installed on average per day throughout the year.

Average daily solar output estimate*

This data assumes an optimal 32° pitch for Perth, see next section for details on optimal panel angles.

Perth receives a lot of sun throughout the year, however the winter months and the shoulder seasons do see a considerable drop in sunshine.

The best months for solar production in Perth are November, December, January and February, all of which should produce around 6 kWh on average with an optimally installed system.

Per kW installed

Full year average: 5.17 kWh

Summer (Jan): 6.61 kWh

Winter (Jul): 3.56 kWh

For a 5kW system

Full year average: 25.85 kWh

Summer (Jan): 33.05 kWh

Winter (Jul): 17.8 kWh

Estimated Daily Solar Production | Per kW installed

Solar Generation Perth.png

Optimal panel angle

The optimal panel angle in Perth for year round solar production is 32° from the horizontal, and facing due North (0° azimuth). This allows for the most total production throughout the year. However, depending on when you use the most electricity, you may want to consider optimising your installation for different times in the year.

Bear in mind that roofs typically have a pitch of between 15 - 30°, and it usually makes sense if you are installing on a house, to simply lie the panels flat on the roof without changing the angle. This is due to cost, fixing and aesthetics. Installs look nicer when they are flat against the roof, they are more secure, and there is extra costs involved in changing the angle, both in parts and labour.

Here is a guide to the different production you will get throughout the year with different panel angles:

Winter optimised production | 47° pitch*

Per kW installed

Full year average: 4.91 kWh

Summer (Jan): 5.69 kWh

Winter (Jul): 3.8 kWh

Perth Solar Generation | winter optimised.png

Summer optimised production | 22° pitch*

Per kW installed

Full year average: 5.16 kWh

Summer (Jan): 7.20 kWh

Winter (Jul): 3.13 kWh

Perth Solar Generation | summer optimised.png

* This data is purely theoretical, based on solar irradiance and a 12% derating, every installation is different and should expect different outputs.

Battery Systems

For details about installing offgrid and hybrid solar energy storage systems in Perth, visit our Battery Systems page.

Solar Installers in Perth

Some of the top ranking installers in Perth on Google are:

  • Renew Energy | Canning Vale WA

  • Clean NRG | Osborne Park WA

  • Solaire Connect | Joondalup WA

Visit our Solar Installer page to see more solar professionals that have provided great insight on our forum.

Cost of Solar in Perth

Solar Rebates

Perth is in zone 3 for the federal STC rebate scheme. This means that for a 5kW system, in 2019 you are eligible for 96 certificates, which at the current price of around $30, you will receive a very handy $2880 off the upfront cost of your system. See our Solar Price Calculator for up to date calculations of STCs on your specific system size, and for a quote on the total cost of a system.

Take a look at Ch 8. What financial incentives are available? in our Guide to Buying Solar for further details.

Solar Quotes & Prices

If you have a quote for a solar installation in Perth, visit our solar forum and you can have your quote reviewed by our team and community.

Examples of some pricing that we have seen for quotes in STC Zone 3 areas in Australia:

  • Panels: 11.1 kW, 30 x 370W Longi | Inverter: Goodwe GW10KL-DT 10kW | Price: AUD$12600 gross ($1.26 per W - based on inverter output). Minus $6000 federal STC rebate = $6600 net

  • Panels: 9.3 kW, 30 x 310W Trina Honey M Plus | Inverter: Fronius Primo 8.2kW | Price: AUD$12100 gross ($1.51 per W - based on inverter output). Minus $5000 federal STC rebate = $7100 net

    • Option with LG Neon 2 panels = $11000 net ($2 per W gross)

  • Panels: 8.64 kW, 27 x 320W REC N | Inverter: SolarEdge HD 8kW | Price: AUD$15500 gross ($1.94 per W - based on inverter output). Minus $5000 federal STC rebate = $10500 net

    • Includes SolarEdge optimisers and Smartmeter

Checkout Ch 5. How much will a solar power system cost? in our Guide to Buying Solar, for more information on cost, and importantly how much you should spend on a solar system.


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