The Growing Solar System Size Trend: Understanding the Rise to 9.4kW

The average size of rooftop solar systems has been steadily increasing year after year. This trend is reflective of broader changes in energy consumption patterns, advancements in solar technology, and evolving consumer preferences. In this article, we will delve into the various factors contributing to this rise, focusing on the current average size of 9.4kW for rooftop solar systems. We’ll explore trends across Australian states, the decline in smaller system installations, and the reasons behind the shift towards larger systems.

Average Rooftop Solar System Size in Australian States

A decade ago, the average size of a rooftop solar system in Australia was around 4.2 kW. Today, this figure has more than doubled, reaching an average of 9.4 kW. This increase is evident across various states, reflecting a nationwide shift towards more substantial solar installations.

In New South Wales, for instance, the average system size has climbed from 4.5 kW to over 9.5 kW in just ten years. Similarly, in Queensland, the trend follows closely, with average system sizes now also around the 9.5 kW mark. Other states, including Victoria and Western Australia, show similar growth patterns, indicating a universal move towards larger systems. This growth can be attributed to a combination of increasing household energy demands, advancements in solar technology, and government incentives aimed at promoting renewable energy adoption.

The Volume of 6 kW Systems Trending Downwards

In contrast to the growth in larger systems, the volume of 6 kW systems has been trending slowly downwards. This decline is partly due to the modest growth in the 8 kW to 10 kW segment, as more consumers opt for bigger systems to meet their energy needs. The preference for larger systems can be linked to the desire for greater energy independence, reduced electricity bills, and the potential for generating surplus energy that can be sold back to the grid.

As the technology becomes more affordable and accessible, homeowners are increasingly seeing the benefits of investing in larger solar systems. This shift is also influenced by the falling costs of solar panels and the rising costs of grid electricity, making larger systems a more economically viable option for many households.

Main Reason for the Increase in Residential Solar System Size

Several factors contribute to the increasing size of residential solar systems, with cost considerations being a primary driver. As electricity prices continue to rise, homeowners are seeking ways to reduce their reliance on the grid. By installing larger solar systems, they can generate more of their own power, offsetting the higher costs of electricity and reducing their overall energy bills.

Additionally, technological advancements have made it easier and more cost-effective to install larger systems. Improved efficiency in solar panels means that homeowners can generate more power from the same roof space, making larger systems more attractive. Government incentives and rebates also play a significant role, encouraging consumers to invest in larger systems to maximize their benefits.

Sharply Rising Residential Electricity Tariffs

One of the most significant factors driving the increase in residential solar system size is the sharply rising electricity tariffs. In recent years, electricity prices in Australia have been on an upward trajectory, putting financial pressure on households. This trend has led many consumers to seek alternative solutions to manage their energy costs, with solar power emerging as a leading option.

The cost of electricity has increased significantly, with some areas experiencing hikes of up to 20% in recent years. This has made solar power a more attractive proposition, as the savings from generating one’s own electricity can be substantial. By installing larger solar systems, homeowners can offset a more significant portion of their electricity usage, providing greater financial relief.

Falling Costs of Rooftop Solar PV

The falling costs of rooftop solar PV systems have also contributed to the increase in the average system size. Over the past decade, the cost of solar panels has decreased dramatically, making solar power more accessible to a broader range of consumers. This price drop, coupled with the availability of financing options and government incentives, has made it easier for homeowners to invest in larger systems.

While the cost of solar panels has decreased, other factors such as labor costs and the reduction of government rebates have impacted the overall cost of installation. Nevertheless, the net effect has been a significant reduction in the cost of rooftop solar PV systems, encouraging more homeowners to opt for larger installations.

Solar Batteries and EV Charging

The integration of solar batteries and EV charging infrastructure is another factor driving the increase in solar system size. As more households invest in electric vehicles (EVs), the demand for home charging solutions has risen. Solar batteries allow homeowners to store excess solar energy generated during the day for use at night or during periods of low sunlight, making larger solar systems more practical and efficient.

The combination of solar power and battery storage provides greater energy independence and security, reducing reliance on the grid and protecting against power outages. This trend is expected to continue as the adoption of EVs increases and battery technology advances, further promoting the installation of larger solar systems.

Increasing Property Value and Rental Yield

Installing a residential solar power system can significantly increase the value of a property and improve rental yields. Homebuyers and renters are increasingly looking for properties with sustainable energy solutions, recognizing the long-term financial and environmental benefits. A home with a larger solar system not only offers lower energy bills but also contributes to a smaller carbon footprint, making it more attractive to eco-conscious buyers and tenants.

Studies have shown that properties with solar power systems sell faster and at a premium compared to those without. This added value is an important consideration for homeowners looking to invest in solar power, as it provides both immediate savings on energy costs and long-term financial benefits.


What is the current average size of a rooftop solar system in Australia? The current average size of a rooftop solar system in Australia is 9.4 kW.

Why has the average solar system size increased to 9.4 kW? The increase is due to rising electricity costs, falling solar panel prices, and a growing preference for energy independence and sustainability.

How do rising electricity tariffs affect the size of solar systems? Rising electricity tariffs incentivize homeowners to install larger solar systems to offset their energy costs and reduce reliance on the grid.

Are there any financial benefits to installing a larger solar system? Yes, larger solar systems can lead to greater savings on electricity bills, potential earnings from selling surplus energy, and increased property value.

What role do solar batteries and EV charging play in the trend towards larger systems? Solar batteries and EV charging infrastructure increase the practicality and efficiency of larger solar systems by allowing excess energy storage and home charging of electric vehicles.

How do government incentives impact the size of solar installations? Government incentives and rebates make it more financially feasible for homeowners to invest in larger solar systems, maximizing their energy production and savings.


The trend towards larger solar system sizes is a reflection of changing energy consumption patterns, technological advancements, and economic considerations. As the average size of rooftop solar systems increases to 9.4 kW, homeowners are reaping the benefits of reduced energy costs, greater energy independence, and increased property values. The factors driving this trend, including rising electricity tariffs, falling solar PV costs, and the integration of solar batteries and EV charging, are likely to continue shaping the future of residential solar power in Australia.

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