Solar pricing in Australia has dropped dramatically over the past decade, but it's still one of the bigger purchases a homeowner makes. Here's what you're actually looking at in 2026, broken down honestly.
Average Solar System Costs in 2026 (After STC Rebate)
These are the realistic installed prices you'll see from reputable installers. They already factor in the federal government's Small-scale Technology Certificate (STC) rebate, which is automatically deducted from your purchase price at point of sale.
| System Size | Suitable For | Price Range (Installed) |
|---|---|---|
| 4kW | Small home, 1–2 people | $4,000 – $6,000 |
| 6.6kW | Average family home | $5,500 – $8,500 |
| 10kW | Large home, high usage | $8,500 – $13,000 |
| 13kW | Very high usage / pool / EV | $11,000 – $16,000 |
The most popular system size for Australian homes is 6.6kW — it's the sweet spot between cost and output, and most standard inverters are rated to accept this size without upgrades.
Why Prices Vary So Much
That wide price range isn't random. Here's what moves the dial:
Panel quality
Budget panels from lesser-known brands might be $0.50–$0.80 per watt. Premium panels from brands like SunPower, REC, or Jinko Tiger Neo run $0.90–$1.20 per watt. Over a 25-year lifespan, the difference in degradation can mean 5–10% more energy from premium panels. For a 6.6kW system, that's real money.
Inverter type
A standard string inverter is the most affordable option ($800–$1,500). Microinverters (one per panel) cost more but handle shading better and allow per-panel monitoring — worth considering if your roof has irregular shading. Hybrid inverters (battery-ready) sit in the middle and are worth the investment if you're planning to add a battery later.
Your roof
A simple single-storey home with a north-facing tin or Colorbond roof is the easiest and cheapest to install on. Multi-storey homes, complex roof shapes, terracotta tiles (which crack if walked on incorrectly), slate, or concrete tiles all add to labour cost. Expect to pay $500–$2,000 more for difficult roofs.
Location
Labour costs vary by state. WA and Queensland tend to have more competitive pricing due to high installer density. Victoria, NSW, and SA are similar. Remote areas pay a premium for travel and logistics.
Switchboard upgrade
If your home's switchboard is old and lacks circuit breakers (as opposed to rewirable fuses), you'll likely need an upgrade before solar can be installed. This adds $800–$2,000 and isn't always included in the quoted price. Always ask upfront.
State-Based Price Comparisons (6.6kW, Installed)
| State | Typical Range |
|---|---|
| QLD | $5,000 – $7,500 |
| NSW | $5,500 – $8,000 |
| VIC | $5,500 – $8,500 |
| SA | $5,500 – $8,000 |
| WA | $5,000 – $7,500 |
| TAS | $6,000 – $9,000 |
Adding a Battery: What That Costs
A solar battery lets you store daytime generation for evening use, reducing your grid dependence significantly. Common options in 2026:
- Tesla Powerwall 3 (13.5kWh): $12,000–$14,000 installed
- Sungrow SBR (9.6–19.2kWh, modular): $8,000–$13,000 installed
- BYD Battery-Box (10.2kWh): $8,500–$11,000 installed
Adding a battery at the same time as solar is almost always cheaper than retrofitting later. If you're interested in eventually going battery, get a hybrid inverter now even if you wait on the battery.
The STC Rebate — How Much Is It Worth?
The federal government's STC scheme provides a rebate based on your system's size and your location's solar irradiance (how much sun you get). As of 2026, the deeming period has reduced to 5 years (down from 6 in 2025), so the rebate is smaller than in previous years. A 6.6kW system now attracts roughly $1,500–$2,500 in STCs depending on your location — already factored into the prices quoted above. The scheme dereates 1/15th each year until it ends in 2031, so this year's rebate is better than next year's.
What Doesn't Affect the Price (But People Think It Does)
- More panels = better: Not necessarily. A 6.6kW system with 16 × 415W panels may outperform a 6.6kW system with 20 × 330W panels from a lesser brand.
- Brand recognition: A well-known brand doesn't mean the best product. Check the actual efficiency and degradation specs.
Getting a Fair Price
Get at least three quotes. Use the same system size and panel brand as your baseline for comparison — otherwise you're comparing apples to oranges. And before you talk to any installer, know what your bill actually says. Upload it to GridBeater and we'll show you your current usage, current spend, and what a properly-sized system is realistically worth to you.
Upload your electricity bill free at GridBeater — know your numbers before you quote