The cost of a residential solar system in Australia depends on several factors, including the system size, the brands you choose, the complexity of your roof, and your location. Prices also shift over time as panel and inverter costs change and government rebates are adjusted.
This guide explains what drives the cost of a solar system, what is included in the price you are quoted, how the government rebate works, and how to compare quotes so you can make an informed decision.
SunRight Solar does not publish fixed prices on this page because every home is different. Instead, we explain the factors that determine your price so you understand what you are paying for and why quotes can vary significantly for the same system size.
Five main factors determine how much your solar system will cost.
Larger systems cost more because they include more panels, potentially a larger inverter, and more mounting hardware and labour. The three most common residential sizes are 6.6kW, 10kW, and 13kW. A 6.6kW system is the most affordable starting point. A 13kW system costs roughly twice as much, but it also generates roughly twice as much electricity.
This is the single biggest factor in price variation between quotes at the same system size. A 6.6kW system using budget panels and a basic string inverter will cost significantly less than a 6.6kW system using premium N-type panels and a Fronius or Enphase inverter. The difference can be 30 to 60 per cent.
The price difference reflects real differences in efficiency, warranty length, degradation rate, monitoring capability, and the manufacturer's ability to honour warranty claims in Australia. A cheaper system is not always worse value, but understanding what you are getting at each price point matters.
A straightforward installation on a single-plane tile or metal roof with no obstructions is the simplest and least expensive to install. Costs increase if your roof has multiple orientations requiring split arrays, steep pitch requiring additional safety equipment, tile conditions requiring bracket replacements, asbestos-containing materials requiring specialist handling, or limited access requiring scaffolding or elevated work platforms.
Some homes need electrical upgrades before a solar system can be connected. Common additional costs include a switchboard upgrade if your existing board is too old or too small to accommodate the solar connection, a meter change from a single-direction meter to a bi-directional meter (usually arranged by your distributor at no cost, but timing varies), or additional circuits if you are adding a battery-ready hybrid inverter.
Installation costs vary slightly between capital cities and regional areas due to labour rates, travel distances, and local distributor requirements. The STC rebate value also varies by postcode zone, which affects the net price after rebate.
A fully installed solar system quote should include all of the following:
solar panels (the specific brand and model should be stated), the inverter (brand, model, and type), mounting rails, roof brackets or hooks, DC and AC isolators, surge protection, and all cabling.
the installation itself (typically one day for a standard system), electrical connection to your switchboard, and system commissioning.
your distributor connection application (DNSP), metering coordination, and STC paperwork (the rebate is handled by your installer).
monitoring setup, a walkthrough of your system, and the installer's workmanship guarantee.
If a quote does not specify the panel and inverter brands and models, or if it does not include the connection application and STC processing, ask for clarification. These are standard inclusions for any reputable installer.
Most installations do not involve additional costs beyond the quoted price, but some homes require extra work. These are the most common:
| Additional cost | When it applies | What to expect |
|---|---|---|
| Switchboard upgrade | If your switchboard is an older model without space for the solar breaker, or if it uses ceramic fuses instead of circuit breakers, it will need upgrading. | This typically costs between $800 and $2,000 depending on the extent of work required. |
| Roof repairs | If your roof has damaged tiles, deteriorated flashing, or structural concerns that are identified during the site assessment, these may need to be addressed before installation. | Solar installers are not roofers, so this work is usually handled separately. |
| Tree removal or trimming | Shading from nearby trees reduces system output significantly. | If shading is identified during the design phase, you may need to arrange tree trimming to optimise your system's performance. |
| Three-phase upgrade | If you want a system larger than 5kW but your home only has a single-phase connection, upgrading to three-phase involves your electricity distributor and an electrician. | This is a separate cost. |
Scroll the table sideways to read all three columns.
A good installer will identify any additional costs during the site assessment and include them as separate line items in your quote, not surprise you after installation.
The federal government provides an upfront discount on residential solar panel systems through the Small-scale Technology Certificate (STC) scheme. This is often referred to as the "solar rebate," although it is technically a certificate-based incentive rather than a direct government payment.
How it works. When you install a solar system, the system is entitled to a certain number of STCs based on its size, your postcode zone, and the number of years remaining until the scheme ends in 2030. Your installer creates and sells the STCs on your behalf and deducts the value from your purchase price. This means the rebate is already applied to the price on your quote.
How much it is worth. The STC value changes with the market price of certificates and reduces each year as the scheme approaches its 2030 end date. The discount is larger for bigger systems and for installations in sunnier zones.
What this means for timing. Because the STC value reduces annually, systems installed in 2026 receive a larger discount than systems installed in 2027 or later. This is not a pressure tactic. It is how the scheme is structured.
State-based incentives may further reduce your out-of-pocket cost. In NSW, the Home Energy Saver Program offers eligible households zero-interest loans of up to $15,000 for solar and battery upgrades.
If you request three quotes for a 6.6kW solar system, you may receive prices that differ by 40 to 80 per cent. This is normal, and it does not necessarily mean the cheapest quote is the best value or the most expensive is unjustified. Here is what drives the variation:
A system using Jinko Tiger Neo N-type panels and a Fronius Symo inverter costs more than a system using entry-level P-type panels and a budget inverter. The premium system will likely generate more electricity, degrade more slowly, carry longer warranties, and be supported by manufacturers with a strong Australian presence.
A standard string inverter is the cheapest option. A hybrid inverter (battery-ready) adds cost but avoids the expense of retrofitting later. Microinverters cost more per panel but deliver better performance on shaded or multi-orientation roofs.
Installers who use commercial-grade mounting hardware, follow manufacturer torque specifications, run neat cable management, and take the time to optimise panel placement cost more than installers who prioritise speed and volume. The installation quality is invisible once the panels are on the roof, but it determines how your system performs and whether your roof stays leak-free for the next 25 years.
Accredited, insured installers with local support teams, proper training programmes, and warranty infrastructure have higher operating costs than low-overhead operators. Those costs are reflected in the quote, and they are what you rely on when something needs attention five or ten years from now.
An unusually low quote may involve unbranded or discontinued panels, an inverter from a manufacturer with limited Australian warranty support, minimal site assessment, or an installer who subcontracts the work without supervising quality. Ask the installer to specify every component by brand and model, and verify that the installer holds current SAA accreditation.
The payback period for a residential solar system depends on four variables: the system cost (after rebate), the amount of solar electricity you self-consume, the feed-in tariff you receive for exported energy, and the electricity tariff you would otherwise pay.
Every kilowatt-hour of solar electricity you use in your home replaces a kilowatt-hour you would have bought from the grid at 30 to 45 cents. Every kilowatt-hour you export earns you a feed-in tariff of 3 to 10 cents. The more of your own solar you use, the faster the system pays for itself.
For a well-sized system on a home with reasonable daytime electricity usage, payback periods typically range from four to six years. After the payback period, the electricity your system generates is effectively free for the remaining 20 or more years of the system's life.
If your household uses very little electricity during the day (because everyone is at work or school), your self-consumption will be low, and more of your generation will be exported at a lower tariff. In this scenario, adding a battery or shifting energy-intensive tasks (washing, dishwasher, pool pump) to daylight hours improves your return.
High daytime usage, high grid electricity tariffs, and a well-sized system (not oversized relative to your consumption) all contribute to a faster payback.
Solar is not a speculative investment. It is a long-term cost reduction. The return comes from avoided electricity purchases over 25 years, not from a single year's savings.
A home battery is a separate purchase that complements your solar system. Battery pricing is covered in detail on our dedicated battery price guide, which is updated regularly with current market pricing.
The key cost consideration when thinking about batteries at the system design stage is the inverter choice. If you install a standard string inverter now and decide to add a battery later, you will need either a replacement hybrid inverter or a separate AC-coupled battery inverter. Both add cost that could have been avoided by installing a hybrid inverter from the start.
If there is any possibility you will add a battery in the next few years, discuss this with your installer during the design phase. The incremental cost of a hybrid inverter over a string inverter is significantly less than the cost of retrofitting later.
The federal Cheaper Home Batteries Program provides around a 30% discount on eligible battery systems, applied automatically at the point of sale.
When you receive multiple quotes, compare them on these criteria rather than just the bottom-line price:
Check the brand, model, wattage, cell technology (N-type is current standard), product warranty (should be 25 years minimum), and performance warranty (should guarantee at least 80% output at 25 years).
Check the brand, model, type (string, hybrid, or microinverter), warranty length, and monitoring platform. If one quote includes a hybrid inverter and another includes a string inverter, the hybrid will cost more but adds battery-readiness.
Does the quote specify the number of panels, the roof sections they will be placed on, and the expected daily and annual output? A quality quote includes a design layout, not just a kW number.
Confirm the quote includes the connection application, STC processing, monitoring setup, and workmanship guarantee. Ask what the guarantee covers and how long it lasts.
Verify that the installer holds current SAA accreditation. You can check this at the SAA accreditation status checker (saaustralia.com.au).
Ask what happens if your system underperforms or a component fails. Does the installer handle warranty claims? Do they have a local support team?
The cheapest quote is not automatically the worst, and the most expensive is not automatically the best. But if a quote is significantly cheaper than others without a clear reason, ask why.
The cost of a 6.6kW system varies depending on the panel and inverter brands selected, your roof type, and your location. Budget systems using entry-level components are at the lower end of the market, while systems using premium N-type panels and branded inverters sit at the higher end. The federal STC rebate is applied at the point of sale and reduces the out-of-pocket cost. For an accurate price for your home, request a personalised quote.
Learn More About the 6.6kW SystemYes. In virtually all residential solar quotes in Australia, the STC rebate has already been deducted from the price you see. If a quote shows a "before rebate" and "after rebate" figure, the "after rebate" price is what you will pay. If you are unsure, ask your installer to confirm.
Price differences between quotes almost always come down to product quality (panel and inverter brands), inverter type (string vs hybrid vs microinverter), installation standards (mounting hardware, cable management, site assessment thoroughness), and the installer's overhead structure. Our guide above explains each of these factors in detail.
Most residential solar systems in Australia pay for themselves within four to six years, depending on your electricity usage, system size, self-consumption rate, and local tariffs. After the payback period, your system generates effectively free electricity for the remaining life of the panels (25 years or more).
Adding a battery increases the upfront cost but improves your self-consumption by storing excess solar for evening use. Whether a battery improves the overall ROI depends on the battery cost, the difference between your feed-in tariff and your grid tariff, and your evening electricity usage. The federal battery rebate reduces the upfront cost by around 30%. Our battery price guide has current pricing.
See Battery PricesA reputable installer will identify any additional costs during the site assessment, before you commit. The most common additional costs are switchboard upgrades (for older homes), meter changes (usually arranged at no cost by your distributor), and any roof repairs identified during assessment. These should be listed as separate line items, not included in the system price without explanation.
Every home is different. The most accurate way to understand what solar will cost for your property is to request a personalised quote based on your roof, your energy usage, and your product preferences. No hidden costs, no pressure.
