Most quotes arrive with two numbers: the full system price and the after-rebate price. The gap between them confuses buyers, and some installers exploit that confusion. This guide explains what Queenslanders actually pay for solar in 2026, what the rebate covers, and how to size a system that pays for itself in a reasonable timeframe.
The Price You See vs the Price You Pay
Australian solar installers are required to pass on the Small-scale Technology Certificate (STC) rebate at point of sale, meaning the after-rebate price is the price you pay. You do not claim anything separately. The federal government funds the rebate through the small-scale renewable energy scheme, administered by the Clean Energy Regulator.
The rebate is worth roughly $330 per kilowatt of installed capacity in 2026, though the exact value fluctuates with the STC market price. It reduces annually until the scheme ends in 2031, so systems installed today attract more certificates than the same system will in three years.
A 6.6kW system in Queensland currently attracts a rebate of approximately $2,100 to $2,500, depending on your postcode and the current certificate price.
What Systems Cost Across Common Sizes
These are typical installed prices after the STC rebate, for a quality mid-range system using N-type TOPCon panels and a reputable inverter:
| System Size | Best For | Typical After-Rebate Cost |
|---|---|---|
| 6.6kW | 2-3 person household, lower daytime usage | $6,500 – 8,500 |
| 10kW | Family home, medium daytime usage | $10,000 – 12,000 |
| 13kW | Large home, high usage or EV charging | $13,000 – 15,000 |
Budget systems using cheaper panels or less established inverters can come in 15-20% lower. Premium systems with HJT panels or premium inverters can sit 20-30% higher. Neither end of the market is wrong, but understanding what drives the difference matters before signing a contract.
To ensure you are purchasing a quality system off a reputable installer, the general guideline is $1 per Watt of panel output. So for a 6.6kw solar system, the baseline is around $6600. With cheaper systems you risk paying twice once the system fails due to low quality equipment or poor installation practices.
What Affects Your Quote
Roof complexity. A simple north-facing, single-storey roof costs less to install than a multi-storey home with multiple pitch angles or valley cuts. Labour charges increase with complexity.
Panel and inverter quality. A tier 1 panel and inverter will outlast budget alternatives by a significant margin. The price difference is real, but so is the performance gap over 25 years.
Single-phase vs three-phase power. Most Queensland homes are single-phase. If you are on three-phase power, a larger inverter or a multi-inverter setup may be required.
Distance from the switchboard. Inverters installed far from your main switchboard require additional cabling. Regional properties sometimes face higher costs here.
Grid connection requirements. In regional Queensland, served by Ergon Energy, connection requirements can differ from those in south-east Queensland under Energex. Some properties require a switchboard upgrade before solar can be connected. Your installer should assess this at the site inspection and include it in the quote.
Battery Storage: What It Costs and When It Makes Sense
Home battery systems in Queensland are now eligible for the federal Cheaper Home Batteries Program, which provides a rebate of approximately $330 per kilowatt-hour of usable storage capacity, according to the Department of Climate Change, Energy, the Environment and Water (DCCEEW).
For a 10kWh battery system, that translates to roughly $3,300 off the installed price. Post- rebate costs for a quality 10kWh system typically range between $7,500 – $12,000.
Batteries make financial sense when your feed-in tariff is low relative to your electricity import rate. In regional Queensland, the mandatory feed-in tariff set by the Queensland Competition Authority sits at 8.66 cents per kilowatt-hour in 2025-26. The QCA’s draft determination for 2026-27 proposes reducing this to 6.15 cents per kilowatt-hour, a 29% reduction. At that rate, storing solar for evening use, rather than exporting it, delivers considerably better financial returns.
If a battery is within your budget and your household uses significant power in the morning and evening, the case for including one from day one is strong.
Note: The Cheaper Home Batteries rebate is subject to periodic step-downs every 6 months until 2030. Confirm the current rate with your installer or check the DCCEEW website before proceeding.
Queensland Feed-in Tariffs and Payback
Feed-in tariffs determine what you earn for solar power exported to the grid. In south-east Queensland, the tariff is set by retailers in a deregulated market. In regional Queensland, the tariff is set by the QCA and applies across all Ergon Energy customers.
The proposed 2026-27 rate of 6.15 cents per kilowatt-hour changes the payback calculation for solar-only systems. At that rate, a kilowatt-hour of solar exported earns roughly one-fifth of what it costs to import the same energy at peak rates. Maximising self-consumption by either shifting usage to daytime hours or installing a battery improves your return significantly.
For a household consuming 25-30kWh per day, a 10kW solar system with a 10kWh battery typically achieves self-sufficiency rates above 80%, substantially reducing reliance on the grid and improving financial returns even at a lower feed-in tariff.
Matching System Size to Your Household
A few questions narrow down the right size quickly:
How much power do you use? Check your electricity bill for daily consumption in kilowatt-hours. Queensland households typically consume 20-25kWh per day, though air conditioning pushes this significantly higher in summer.
How much of your usage occurs during the day? If you or family members are home during the day, or if you run pool pumps, air conditioning, and appliances during daylight hours, a larger system pays itself back faster. If your home is empty during the day, a battery becomes more important.
Do you have an electric vehicle? EV charging adds 8-20kWh per day depending on usage and charger speed. This meaningfully increases the optimal system size.
What does your roof allow? North-facing panels produce the most output. East and west-facing panels are viable and can extend the production window, though total output is lower per panel.
What Does Payback Actually Look Like?
At current electricity rates in Queensland, a 6.6kW system costing $6,600 after rebate and reducing a household’s import bill by $1,400 to $1,800 per year pays itself back in approximately four years. A 10kW system with a 10kWh battery runs closer to six to eight years, depending on usage patterns, electricity rate movements, and how much solar you self-consume.
These are estimates. Your actual payback period depends on your usage profile, export income, electricity rates, and future tariff movements. An installer who has worked extensively in your area, and understands your local network conditions, will give you a more accurate projection.
Get a Quote Tailored to Your Home
Every home has a different roof, a different electricity bill, and a different set of energy goals. A quote from a local installer who understands Ergon Energy’s requirements and Queensland’s climate conditions will be more accurate than any national estimate.
