Understanding the average cost of a 5kW solar system in Brisbane for 2025

Navigating the world of solar can feel overwhelming, but I’m here to break it down for you. As of late 2025, the upfront cost for a good quality 5kW solar system in Brisbane generally falls between $3,500 and $6,000. Some sources indicate the range could be between $5,000 and $8,000 for higher-end systems. This price includes the panels, inverter, and standard installation, and it’s the figure you’ll see after the federal government’s rebate has been deducted.

Several key factors influence where your quote will land within this range:

• Component quality: Premium, high-efficiency solar panels and top-tier inverters cost more than budget options, but they often deliver better performance and have longer warranties.
• Installation complexity: A simple installation on a single-storey, tin roof will be the most affordable. Costs will increase for multi-storey homes, tiled roofs, or roofs with steep angles or significant shading, as these require more labour and specialised mounting equipment.
• Installer choice: The company you choose to do the installation will affect the price. While it can be tempting to go for the cheapest quote, it’s crucial to select a reputable installer with Solar Accreditation Australia (SAA) credentials to ensure a safe and compliant setup.

A 5kW system is a popular choice for the average Brisbane household as it can generate around 20 to 22 kWh of electricity per day, which is often enough to significantly reduce or even eliminate your power bills.

Decoding the 5kW solar system price Brisbane installers offer in packages

When you start getting quotes, you’ll notice that installers usually present them as packages. This simplifies the process, but it’s important to know what you’re looking at.

A standard 5kW solar system package in Brisbane should include:

• Solar panels: Typically between 12 and 15 high-efficiency panels, depending on their individual wattage (which can range from 330W to 440W).
• A 5kW inverter: This is the heart of your system, converting the DC electricity from the panels into AC electricity your home can use.
• Mounting system: The framework that securely attaches the panels to your roof.
• Professional installation: This should always be carried out by an SAA-accredited installer to ensure it meets Australian standards.
• Warranties: Expect a performance warranty of around 25 years for the panels and a manufacturer’s warranty of 10 years for the inverter.
• Monitoring system: Most modern systems come with WiFi-enabled monitoring, allowing you to track your energy production via an app.

Gigi’s pro tip: Don’t just compare packages on price alone. Look closely at the brands of the panels and the inverter. A slightly more expensive package with premium components from reputable manufacturers can provide better long-term value and reliability.

What Queensland government solar rebates are available in 2025?

This is a common point of confusion. As of October 2025, there are no specific state-run solar panel rebates for Brisbane homeowners. The highly publicised Queensland battery rebate schemes, like the Battery Booster program, have now closed.

However, there are other valuable state-level incentives:

• Feed-in tariffs: While not an upfront rebate, this is a credit you receive on your electricity bill for any excess solar energy your system exports back to the grid. In Southeast Queensland, the rates are set by your electricity retailer and can be competitive.
• Supercharged Solar for Renters: In a positive move for energy equity, the Queensland government is introducing the “Supercharged Solar for Renters” program. This scheme aims to provide a rebate of up to $3,500 to landlords to incentivise them to install solar on rental properties, allowing tenants to share in the bill savings.

What federal government solar incentives can you get in Australia for 2025?

The most significant financial incentive available to Brisbane residents comes from the federal government’s Small-scale Renewable Energy Scheme (SRES). This is often referred to as the “solar rebate.”

Here’s how it works:

• The scheme provides a point-of-sale discount on the upfront cost of your solar system.
• It works by creating Small-scale Technology Certificates (STCs) based on your system’s size and location.
• Your solar installer will claim these certificates on your behalf and deduct their value from your final bill.
• For a 5kW system in Brisbane, this federal incentive can reduce the total cost by around $1,640.

It’s important to know that the value of STCs decreases on the 1st of January each year until the scheme is phased out in 2030. This means that the sooner you install, the larger the discount you will receive.

Breaking down the 5kW solar system installation cost in Brisbane

The installation itself is a significant part of the total cost of a 5kW solar system. For a straightforward installation, the labour cost is already factored into the $3,500 to $6,000 price range.

However, certain factors can increase the installation cost:

• Multi-storey homes: Working at greater heights requires additional safety equipment and time.
• Roof type: Tiled or decramastic roofs are more labour-intensive to work on than standard metal roofs.
• Switchboard upgrades: If your home’s switchboard is old or doesn’t meet current safety standards, it will need to be upgraded, which can add several hundred dollars to the total cost.
• Electrical work: Complex wiring runs or difficult access can also add to the labour charges.

Always ask your installer for a detailed quote that clearly separates the costs of components from the cost of installation.

What is the cost of solar panels per watt in Brisbane?

Thinking about the price on a per-watt basis can be a useful way to compare quotes. In Australia, the average installed cost per watt for a residential solar system is between $0.88 and $1.45. For a typical 5kW (5,000 watt) system in Brisbane, you can expect the cost to be around $1.13 per watt. So, a 5,000-watt system would come out to approximately $5,650, which aligns with the overall price range.

The final piece: a 5kW solar system with battery cost in Brisbane

Adding a battery to your solar system allows you to store the excess energy you generate during the day for use at night, further reducing your reliance on the grid. However, it does add a significant cost.

In 2025, adding a battery to a 5kW solar system in Brisbane can increase the total price substantially. The additional cost for a battery can range from $9,000 to $14,000, depending on its capacity and brand. This means a full 5kW solar system with a battery could cost between $12,500 and $20,000.

The good news is that the federal government launched the “Cheaper Home Batteries Program” on July 1, 2025. This program provides a rebate that can take about 30% off the upfront cost of an eligible battery system. For an average 10kWh battery, this could equate to a saving of around $3,440.

Is a 5kW system right for your home?

Deciding on the right solar system for your home is a big decision, but it doesn’t have to be a complicated one. A 5kW system is a fantastic starting point for many Brisbane families, offering a great balance of energy production and affordability.

If you’re ready to take the next step and get a proper quote, I can introduce you to a trusted, SAA-accredited local expert who can assess your home’s specific needs—just fill out the form below. For a quick, personalised estimate of solar costs and savings for your home, you can also try the free solar assistant on this page.