Cost to upgrade solar panels Brisbane

As our homes evolve, our energy needs often do too. Whether you’ve bought a home with an older, small solar system or your family and power bills have simply grown, the question of upgrading your solar panels is becoming more common here in Brisbane.

I know firsthand that navigating the world of solar can feel complex, filled with technical jargon and a dizzying array of products. You’re likely wondering if it’s worth the investment and what the real costs are.

That’s why I’ve put together this comprehensive guide. I’ll walk you through the different types of upgrades, their associated costs in Brisbane for 2025, and the rebates and incentives you can actually get. My goal is to give you the clarity and confidence to make the best decision for your home.

Cost to upgrade solar panels Brisbane: What to expect

When we talk about upgrading, it’s not just a single action. It can mean a few different things, each with its own price tag. The total solar panel upgrade cost depends entirely on the scale of your project.

Here’s a breakdown of the typical costs for different upgrade scenarios in Brisbane this year:

• Replacing your solar inverter: A straightforward inverter swap for a quality 5kW model will typically cost between $1,600 and $3,000. This is often necessary when your old inverter fails or isn’t capable of handling a larger panel array.
• Adding more panels: If your current inverter can handle the extra capacity, adding new panels is a great option. However, it can be complex due to panel matching and wiring. Costs vary significantly, but you should budget for the price of the new panels plus specialised labour.
• Full system replacement: This involves removing your old system and installing a brand new, larger one. It’s the most expensive option but often the most effective. For a popular 6.6kW system, expect to pay between $5,200 and $8,700, while a larger 10kW system can range from $8,000 to $12,000 after federal rebates are applied.
• Panel removal and reinstallation: If you’re upgrading your roof and need your existing panels taken off and put back on, this service typically costs around $85 per panel. For a standard 20-panel system, that’s about $1,700.

Understanding solar panel upgrade costs in Brisbane

Several key factors will influence the final price of your solar upgrade. It’s important to consider these when getting quotes to ensure you’re comparing apples with apples.

• System Size (kW): The biggest cost driver is the capacity of the new panels or system you’re installing. The jump from a small 3kW system to a 10kW one is substantial.
• Component Quality: Premium, high-efficiency panels and top-tier inverters come with a higher upfront cost but often deliver better performance and longer warranties.
• Installation Complexity: The price can be affected by factors like a multi-storey house, a steep or complex roof design, or the need to upgrade your home’s switchboard to meet current safety standards.
• Accredited Installer: Always use a Solar Accreditation Australia (SAA) accredited installer. While it might seem cheaper to go with a less qualified tradesperson, it can void warranties and make you ineligible for rebates.
• Gigi’s pro tip: When adding new panels, it’s often difficult to find panels that are compatible with your older ones. Technology changes quickly! Many homeowners find that a full system replacement is a more straightforward and future-proof solution in the long run.

Government rebates for upgrading solar panels

This is where many people get confused. Are there specific rebates for simply upgrading? The short answer is no, not directly. However, you can still access significant financial incentives for the new components you install as part of your upgrade.

• Federal Government Rebate (STCs): The Small-scale Renewable Energy Scheme (SRES) is the main incentive available. It provides a point-of-sale discount on new solar systems, including panels and inverters. This rebate is based on the size of the new system you install and can reduce the upfront cost by thousands. For example, a new 6.6kW system in Brisbane could receive a rebate of around $2,000 to $2,500 in 2025. It’s important to know this rebate amount reduces each year, so acting sooner can mean greater savings.
• Federal Battery Rebate: If your upgrade includes adding a battery, the new “Cheaper Home Batteries Program” which started in July 2025 is a game-changer. It can provide a discount of around 30% on the cost of an eligible battery installation. For an average household, this could mean a rebate of up to $4,000.
• Queensland Government Incentives: Currently, there are no state-level grants or rebates for upgrading solar panels for existing homeowners. The previously available “Battery Booster Program” has now closed. However, the government has announced interest-free loan programs in the past, so it’s always worth checking for the latest updates.
• Brisbane City Council Incentives: The Brisbane City Council does not offer specific solar upgrade incentives for individual homeowners. Their sustainability grants are targeted towards non-profit and community organisations.

Real-world cost examples: From 6kW to 10kW upgrades

To give you a clearer picture, let’s look at some common upgrade scenarios in Brisbane.

Average cost of a 6kW solar panel upgrade Brisbane 2025

If you’re replacing an old, small system with a new, standard 6.6kW system, you can expect the cost to be between $5,210 and $5,530 on average. This price typically includes quality panels, a 5kW inverter (which is standard for this size system), and installation by an accredited professional, after the federal STC rebate has been applied.

Cost to upgrade from a 3kW to 10kW solar system Brisbane

This is a significant leap, often considered by families with growing energy needs, those adding a battery, or buying an electric vehicle. Here’s a potential cost breakdown:

• Cost of a new 10kW system: In Brisbane, a quality 10kW system in 2025 costs between $8,000 and $12,000 after the federal rebate.
• Cost to remove old 3kW system: You would need to factor in labour costs for the safe removal and disposal of your old panels and inverter, which could be in the range of $500 to $1,000.

Therefore, a reasonable estimate for a full upgrade from a 3kW to a 10kW system would be in the range of $8,500 to $13,000.

Is it the right time to upgrade your solar?

Deciding whether to upgrade comes down to your home’s specific situation. If your current system is constantly underperforming, if your inverter is out of warranty, or if your power bills are creeping up despite having solar, an upgrade could be a very smart financial move.

The key is to weigh the upfront cost against the long-term savings on your electricity bills. With the current federal rebates still offering significant discounts, 2025 remains a great year to invest in your home’s energy future.

If you’re ready to get a precise quote for your home, I can introduce you to a trusted, SAA-accredited local expert. They can provide a detailed assessment and help you navigate your options. For a quick, personalised estimate of solar costs and savings, you can also try the free solar assistant on this page.