If you’ve started collecting solar quotes, you’ve probably noticed the numbers don’t always add up the way you’d expect. One quote says $3,999, another says $8,500, and a mate down the road swears he paid $15,000 — for what looks like the same size system. This guide breaks down exactly what goes into the total cost of a solar system, so you know what you’re paying for and where the differences come from.
The Short Answer
As a rule of thumb, a good-quality, fully installed solar system in Australia costs around $1,000 per kilowatt (kW) before rebates, or roughly $900–$950 per watt after the federal STC rebate is applied at the point of sale. In practice, that looks like:
System Size | Typical Cost After Rebate | Best Suited For |
|---|---|---|
5 kW | $4,000–$6,500 | Small homes, low daytime usage |
6.6 kW | $5,000–$8,500 | The most common choice — 3–4 bedroom homes |
10 kW | $8,000–$10,500 | Larger homes, ducted AC, EV charging |
13 kW+ | $10,500–$15,000+ | High-usage households, pool pumps, EVs |
These figures already include GST and the upfront discount from the Small-scale Renewable Energy Scheme (STCs) — the biggest single reason your “sticker price” is lower than the true cost of the hardware and labour.
Average Solar System Prices Across Australia (After STC Rebate)
| State | 6.6 kW Solar System | 10 kW Solar System |
|---|---|---|
| NSW | $5,500–$8,500 | $8,500–$10,500 |
| VIC | $5,000–$8,000 | $8,000–$10,000 |
| QLD | $5,000–$8,000 | $8,000–$10,000 |
| SA | $5,200–$8,300 | $8,300–$10,500 |
| WA | $5,500–$8,500 | $8,500–$10,800 |
Important note: Prices vary depending on roof type, installer, equipment, rebates, and local distributor requirements.
What's Actually Included in the Price
A solar quote isn’t just paying for panels stapled to your roof. A proper installation price covers:
1. The solar panels
Panel prices vary enormously by brand — a budget panel might cost around $130, while a premium tier-1 panel can run $290 or more. On a 10 kW system, that difference alone can add over $3,000 to your quote before you’ve even looked at anything else.
How Much Does One Solar Panel Cost?
Although solar systems are sold as complete packages, the panel itself typically costs:
- Budget panel: $120–$170
- Mid-range Tier 1 panel: $170–$240
- Premium panel: $240–$350
However, remember that the panel usually represents only 30–40% of the total project cost. The remainder covers the inverter, mounting system, electrical work, installation labour, compliance, warranties, and grid connection.
2. The inverter
This converts the DC electricity your panels generate into AC power your home can use. String inverters are the standard, budget-friendly option; microinverters and power optimisers cost more but can improve performance on shaded or complex roofs.
3. Mounting and racking
The rails, brackets, and roof attachments that physically hold your system in place. Tile roofs, tin roofs, and multi-storey homes all have different mounting requirements and costs.
4. Installation labour
includes scaffolding or safety equipment, electrical wiring, switchboard upgrades if needed, and the certified installer’s time. This is where quality installers (and their insurance, training, and accreditation) genuinely cost more — and it’s usually worth it.
5. Compliance, metering, and grid connection
Your installer needs to lodge paperwork with your electricity distributor, arrange a bi-directional meter (or a meter upgrade), and ensure the system meets Australian Standards. Skipping proper compliance is a major red flag with ultra-cheap quotes.
6. Monitoring
Most modern systems include an app or web portal so you can track generation and usage in real time.
The Big Deduction: The STC Rebate
Almost every quote you see already has a substantial discount baked in — the Small-scale Technology Certificate (STC) rebate. Instead of a cheque in the mail, your installer applies this discount at the point of sale.
A few things worth knowing:
- The rebate is based on your system’s size, your location (postcode “zone”), and the number of years left until 2030, when the scheme fully winds down.
- The value of the rebate shrinks every January 1, as the scheme phases out. A system installed today is worth a slightly larger rebate than the same system installed next year.
- On a 10 kW system, the STC rebate is currently worth around $2,500 off the price at the point of sale.
This is genuinely one of the most useful pieces of context for interpreting your quote: two installers offering the “same” system may show different final prices simply because one is correctly applying your STC eligibility and the other isn’t — or is fudging the numbers.
Should You Add a Battery? What That Adds to the Cost
Batteries are increasingly part of the conversation, especially with the federal Cheaper Home Batteries Program now in effect. A quality 10–14 kWh home battery, installed, typically costs $8,000–$13,000 after the federal battery rebate (versus $9,000–$15,000 before it). Premium integrated units, like a Tesla Powerwall 3, sit toward the top of that range once you include the mandatory backup gateway.
Adding a battery roughly doubles your total project cost, but it also changes what the system does for you — instead of only saving money while the sun’s up, you’re using stored solar power in the evening, which is when most households actually consume the most electricity.
Hidden or "Optional" Costs to Ask About Upfront
The cheapest quote on the table isn’t always the cheapest system once these get added:
- Switchboard upgrades — older homes sometimes need this to safely handle a larger system.
- Tricky roof access — multi-storey homes, steep pitches, or tile roofs can add scaffolding or labour costs.
- Extra roof space or panel repositioning — if your roof has limited north-facing space, an installer may need to split the array across multiple sides, which is more labour-intensive.
- Export limiting equipment — some networks cap how much solar you can send back to the grid, requiring extra hardware to comply.
- Consumption monitoring or smart home integration, if you want it.
A trustworthy installer will walk you through these during your site assessment rather than surprising you with them after the deposit is paid.
Why Two "Same Size" Quotes Can Differ by Thousands
When you’re comparing quotes, the price gap usually comes down to one or more of:
- Panel and inverter tier — budget components vs premium, tier-1 brands.
- Installer overheads — accreditation, insurance, warranty backing, and workmanship guarantees all cost money, and cutting corners here is the single biggest risk in the industry.
- Correct STC and rebate application — some quotes underquote the rebate, or overstate it, to look more attractive.
- What’s actually included — check whether switchboard work, compliance certificates, and monitoring are bundled in, or billed as “extras” later.
The lowest number on the page isn’t always the best value. It’s worth asking every installer to show you their price before rebates, and their price after, so you can see exactly what discount is being applied and confirm it’s accurate for your system size and postcode.
How Long Does a Solar System Take to Pay for Itself?
For many Australian households:
- 5 kW system: 4–6 years
- 6.6 kW system: 3.5–5 years
- 10 kW system: 4–6 years
The exact payback depends on:
- electricity prices
- daytime energy usage
- feed-in tariff
- system orientation
- shading
- battery usage
After reaching payback, the electricity your system generates is effectively free, aside from occasional maintenance or inverter replacement later in its lifespan.
What Could Solar Save Over 25 Years?
A quality 6.6 kW solar system may generate approximately 240,000–260,000 kWh over its lifetime. Depending on electricity prices and household usage, that could translate into:
- $45,000–$70,000 in avoided electricity costs
- significantly reduced exposure to future electricity price increases
- lower household carbon emissions
Where Does Your Money Go?
Approximate breakdown:
- Solar panels — 30%
- Inverter — 15%
- Mounting hardware — 10%
- Installation labour — 20%
- Electrical components — 10%
- Compliance & approvals — 5%
- Business overheads, warranties & support — 10%
How to Compare Quotes? Before Accepting a Solar Quote
✓ Are the panel and inverter brands clearly listed?
✓ Is the STC rebate shown separately?
✓ Are installation and labour included?
✓ Does the quote include monitoring?
✓ Is the installer Clean Energy Council accredited?
✓ Is switchboard work included if required?
✓ What are the product and workmanship warranties?
✓ Who provides after-sales support?
Be Careful of Quotes That Look Too Good to Be True
If one installer is thousands of dollars cheaper than everyone else, ask yourself why. Sometimes the lower price comes from:
- inferior solar panels
- lower-quality inverters
- inexperienced installers
- subcontracted labour
- shorter workmanship warranties
- hidden extra charges
- no post-installation support
A solar system is expected to last 25–30 years, so paying slightly more for a reputable installer often provides better long-term value.
For most Australian households, a well-specified 6.6 kW–10 kW system will land somewhere between $5,000 and $10,500 after the STC rebate, with a battery adding another $8,000–$13,000 if you choose to include one. The real value in comparing quotes isn’t just chasing the lowest number — it’s understanding exactly what’s included, how the rebate has been applied, and what level of component and installer quality you’re paying for.
Thinking about your own system size and budget? Get in touch with the AYKA Solar team for a tailored, no-obligation quote based on your roof, your usage, and your goals.
Let’s build a safer, smarter, and more sustainable energy future together!
