Key points
- As of October 2026, a typical 6.6kW system in Adelaide costs about $5,800–$7,200 installed, and a 10kW system about $8,400–$10,000, after the federal STC discount and including GST.
- Adelaide is in STC Zone 3, so a 6.6kW system earns about 45 STCs in 2026, worth roughly $1,500–$1,800 off the price.
- South Australia has no state solar panel rebate in 2026. The STC discount is the main incentive.
- The STC discount drops by about a fifth on 1 January 2027, when the deeming period falls from five years to four.
- With SA’s high electricity prices, a well-sized system often pays for itself in roughly 4–6 years.
The solar panel cost in Adelaide for 2026 is among the lowest of any Australian capital. Most households pay around $5,800 to $7,200 for a 6.6kW system and $8,400 to $10,000 for a 10kW system, fully installed, once the federal discount is taken off. This guide breaks down prices by system size, shows how the STC discount is calculated for an Adelaide postcode, explains what pushes a quote up or down, and works through realistic payback numbers using South Australian tariffs.
How much do solar panels cost in Adelaide in 2026?
The most useful independent benchmark is the Solar Choice Price Index, which averages quotes from installers across its network each month. The table below uses its 1 October 2026 Adelaide figures. Prices include GST and the STC discount. “Standard” is the typical mid-range offer most buyers choose; “premium” uses higher-end panels and inverters and runs about 20–30% more.
| System size | Standard tier (Adelaide) | Premium tier (Adelaide) | Approx. panels (440–475 W) |
|---|---|---|---|
| 5kW | $4,740 | $5,860 | 11 |
| 6kW | $5,320 | $6,550 | 13 |
| 6.6kW* | ~$5,800–$6,000 | ~$7,200 | 14–15 |
| 7kW | $6,140 | $7,510 | 15–16 |
| 10kW | $8,360 | $10,010 | 21–23 |
| 13.2kW* | ~$10,500–$11,500 | ~$13,000–$13,500 | 28–30 |
*The index doesn’t publish 6.6kW or 13.2kW figures, so these rows are our estimates, scaled from the published price per watt. Treat every number here as a guide to typical 2026 market prices, not a quote.
Notice the price per watt falls as systems get bigger. In Adelaide a standard 6kW system works out at about $0.89 per watt, while a 10kW system is about $0.84 per watt. The fixed costs of a job (travel, scaffolding or harness setup, paperwork, network approval, the switchboard work) are spread across more panels. If you’re unsure which size suits your household, our guide to what size solar system you need walks through the maths.
This article is part of our complete buying guide to home solar panels, which covers panel technology, inverters, installation and quotes in more depth.
How the STC discount works for an Adelaide home
Almost every rooftop system under the Small-scale Renewable Energy Scheme creates small-scale technology certificates (STCs). Your installer usually takes their value straight off the quote. The number of STCs depends on three things: system size, your postcode’s zone rating and the “deeming period” (the number of years of generation credited up front).
Metropolitan Adelaide is in Zone 3, with a rating of 1.382 MWh per kW. Installs in 2026 use a five-year deeming period. So for a 6.6kW system:
- 6.6 kW × 1.382 × 5 years = 45.6, rounded down to 45 STCs
- At the October 2026 spot price of just under $40, that’s up to about $1,800
- The Clean Energy Regulator notes agents usually pay $33–$38 per certificate, so the discount on your quote is more likely $1,500–$1,700
| System size (Adelaide, Zone 3) | STCs if installed in 2026 | Approx. discount 2026 | STCs if installed in 2027 |
|---|---|---|---|
| 6.6kW | 45 | $1,500–$1,800 | 36 |
| 10kW | 69 | $2,300–$2,750 | 55 |
| 13.2kW | 91 | $3,000–$3,650 | 72 |
Because Adelaide gets more sun than Melbourne or Hobart, the same system earns more certificates here. For the full formula and how certificate prices move, see how the federal STC solar rebate is calculated.
Are there any South Australian solar rebates in 2026?
No. South Australia does not offer a state rebate for solar panels in 2026. The former Home Battery Scheme closed in 2022, and the REPS virtual power plant incentive ran out of general funding in May 2026 (it remains open only to priority groups for the rest of the year). For panels, the federal STC discount is the incentive that matters.
If you add a battery, the federal Cheaper Home Batteries Program applies on top. We cover every remaining option, including VPP sign-up credits, in solar rebates in South Australia for 2026.
What drives solar panel cost in Adelaide?
Two quotes for the “same” 6.6kW system can be $2,000 apart. These are the usual reasons:
- Panel and inverter tier. Most 2026 panels are 440–475 W N-type TOPCon modules. Premium brands, back-contact panels and well-known inverters cost more but often bring longer warranties and better local support.
- Microinverters or optimisers. Panel-level electronics help on shaded or complex roofs but add to the price compared with a single string inverter.
- Roof type and access. Tin (Colorbond) roofs are usually quickest. Terracotta tiles, steep pitches, double-storey homes and arrays split across several roof faces take more labour.
- Switchboard and metering. Older Adelaide homes sometimes need a switchboard upgrade or extra protection devices before solar can be connected.
- Single-phase or three-phase. Three-phase homes can host larger inverters, which can mean different equipment and pricing.
- SA Power Networks export choice. New systems choose either a fixed export limit (0–1.5 kW per phase, depending on area) or Flexible Exports of up to 10 kW per phase. Flexible Exports need a compatible, internet-connected inverter, and every new system must meet SA’s remote disconnection (“Smarter Homes”) rules.
- Battery-ready hybrid inverter. If you plan a battery later, a hybrid inverter costs more now but can save money down the track.
When you line up quotes, compare exact brands, models, warranties and what’s excluded, not just the bottom line. Our checklist on how to compare solar quotes covers the details.
How to tell if an Adelaide solar price is fair
As a rough guide, a standard-quality system in Adelaide sits around $0.80–$0.95 per watt installed after STCs, and premium equipment around $1.00–$1.10 per watt. Prices well below that range deserve a closer look. Check that:
- the panels and inverter are on the Clean Energy Council’s approved products list (required for STCs)
- the installer is accredited by Solar Accreditation Australia (SAA)
- the quote names the panel and inverter models, not just “tier 1”
- it includes the network application, compliance certificate and any meter work
- it states both product and workmanship warranties
How much will solar save you in Adelaide?
South Australia has some of the highest electricity prices in the country. Under the 2026–27 Default Market Offer, the flat-rate usage price is capped at about 41.9c per kWh in the SA Power Networks area, and many market offers sit in the mid-to-high 30s. Every kilowatt-hour your panels supply directly to the house avoids that price.
Exports are worth far less. There is no minimum feed-in tariff in SA, and retailer rates are typically 0–8c per kWh, often with daily caps. SA Power Networks also introduced a two-way network tariff in July 2025 that can add a small charge (around 1c per kWh) for midday exports above a free daily allowance, which some retailers pass on. That’s why the value of solar in Adelaide now comes mostly from using it yourself.
A well-oriented system in Adelaide produces about 4.2 kWh per installed kW per day across the year. Here are some worked examples using 37c per kWh for power you use and 3c for exports:
| Scenario (Adelaide) | Price after STCs | Annual output | Share used at home | Annual saving | Simple payback |
|---|---|---|---|---|---|
| 6.6kW, standard tier | $6,000 | 9,500 kWh | 30% | ~$1,250 | ~4.8 years |
| 6.6kW, standard tier | $6,000 | 9,500 kWh | 40% | ~$1,580 | ~3.8 years |
| 10kW, standard tier | $8,500 | 14,500 kWh | 25% | ~$1,670 | ~5.1 years |
| 10kW, premium tier | $10,000 | 14,500 kWh | 35% | ~$2,160 | ~4.6 years |
These are simplified estimates. Your own result depends on your tariff, how much you use during daylight and whether you join a plan such as Solar Sharer (free grid power from 12pm to 3pm, launched in SA on 1 July 2026). For a deeper look at the economics of a larger system, read whether a 10kW solar system is worth it.
Tip: Running the dishwasher, washing machine, pool pump and hot water during the day lifts the share of solar you use. Moving from 30% to 40% self-consumption can cut a year or more off your payback.
Should you install solar before 1 January 2027?
The STC deeming period steps down every January until the scheme ends in 2030. On 1 January 2027 it falls from five years to four, which cuts the certificates for a 6.6kW Adelaide system from 45 to 36. At current certificate prices that’s roughly $300–$360 more out of pocket for a 6.6kW system and around $460–$560 for a 10kW system.
That’s a real saving, but not big enough to justify rushing into a poor quote. The date that counts is the installation date, so allow time for site inspection, SA Power Networks approval and scheduling if you’re aiming for 2026.
Frequently asked questions
How much does a 6.6kW solar system cost in Adelaide?
As of October 2026, most 6.6kW systems in Adelaide cost about $5,800 to $6,000 for standard-quality equipment and around $7,200 for premium panels and inverters. These prices include GST and the federal STC discount of roughly $1,500 to $1,800. Roof type, switchboard work and brand choice can move the price either way.
Is there a solar rebate in South Australia in 2026?
There is no state-funded solar panel rebate in South Australia in 2026. The main incentive is the federal STC discount, which is applied at the point of sale by your installer. If you add a battery, the federal Cheaper Home Batteries Program can reduce the battery price as well.
How long does solar take to pay for itself in Adelaide?
A typical well-sized system in Adelaide pays for itself in about 4 to 6 years. The payback is shorter if you use more of your solar during the day, because each kilowatt-hour you use yourself saves around 35 to 40c, while exported power often earns only a few cents.
Will solar panels cost more in 2027?
The STC discount shrinks on 1 January 2027 because the deeming period drops from five years to four. All else being equal, a 6.6kW system in Adelaide will cost roughly $300 to $360 more. Equipment prices and the Australian dollar also move, so actual 2027 prices could differ.
Looking for a straight answer on what your roof will cost? Our Adelaide team installs CEC-approved panels and inverters on homes across metropolitan Adelaide and regional SA. Read more about solar panels in Adelaide, browse our home solar packages, or get a free quote with itemised pricing.
Sources: Solar Choice – Solar Panel Costs: Solar Choice Price Index (1 October 2026); Solar Choice – 13kW Solar Systems: Price, Output and Payback (September 2025); Clean Energy Regulator – Rooftop solar (updated 18 September 2026); Australian Energy Regulator – Default Market Offer prices 2026–27 (May 2026); SA Power Networks – Flexible Exports (accessed October 2026). Prices are indicative market averages as of October 2026 and change often; STC values and tariffs change too, so always confirm with a written quote and your retailer. Featured image: Benlisquare / Wikimedia Commons, CC BY-SA 4.0.
