How Much Does Solar Cost in Australia?

Residential solar installation costs between $4,000 and $9,500 installed, or approximately $1,000–$1,500 per kilowatt of capacity before rebates. This price includes panels, inverter, racking, isolators, labour, grid paperwork and monitoring setup by an accredited electrician.

A typical household installs a 5 kW system (13–15 panels), which falls into the $5,000–$7,500 installed range. A larger 8 kW system may cost $7,500–$10,000 or more. Smaller 3 kW systems start around $4,000–$5,500. These are market guidance ranges; your actual quote depends on site conditions, panel tier and your distribution network operator's connection rules. Always request a written quote after a free site inspection from an SAA-accredited installer.

Small-scale Technology Certificates (STCs) are tradeable environmental credits issued under the Small-scale Renewable Energy Scheme (SRES) administered by the Clean Energy Regulator. An installed solar system generates certificates based on its capacity and location; your installer sells these certificates and applies the income as an upfront discount to your invoice.

The STC discount amount is calculated as: system capacity (kW) × zone multiplier (1.0–1.83) × deeming years (5) × current STC price ($38 per STC). A 5 kW system in a 1.5 zone generates 5 × 1.5 × 5 × $38 = $1,425 discount. A 6 kW system in a 1.83 zone generates 6 × 1.83 × 5 × $38 = $2,084 discount. Zone multipliers are highest in southern and inland areas (Tasmania, Victoria, southern New South Wales) and lower in northern regions.

Your postcode's zone multiplier is published by the Clean Energy Regulator at cer.gov.au. The STC price fluctuates as credits are traded; the government sets a maximum value of $38 per certificate (adjusted annually). Confirm your property's zone and the current STC price before you sign a quote, as the discount affects your out-of-pocket cost immediately.

Solar installation price varies by system size, panel and inverter brand, roof type and condition, switchboard status, single or three-phase power supply, and available rebates. Understanding these factors helps you understand why quotes differ between installers and properties.

Solar battery installation costs $7,000–$15,000 for a typical 5–10 kWh lithium system. The Cheaper Home Batteries program (live from 1 July 2025) subsidises battery purchase based on capacity: approximately $252/kWh for the first 14 kWh, $151/kWh for 14–28 kWh, and $38/kWh for 28–50 kWh (rates confirmed from 1 May 2026).

A 10 kWh battery might receive a subsidy of 10 × $252 = $2,520, reducing your out-of-pocket cost from $10,000 to $7,480 (example only; actual prices vary by brand and installer). Subsidy rates and eligibility rules change annually on 1 July. Confirm the current subsidy rate and your eligibility with your state energy agency or the Department of Climate Change, Energy, Environment and Water (DCCEEW) before you commit to a quote. The subsidy is applied at purchase, not as a tax refund.

Most residential solar systems recover their cost (after rebates) in 5–8 years through electricity bill savings. Battery systems typically take 7–12 years because battery capacity costs more and degrades slowly over time.

Payback depends on four variables: your system size, your annual electricity consumption, your distribution network operator's feed-in tariff (the price you receive for surplus power exported to the grid), and your location's solar irradiance. A 5 kW system in a sunny postcode (e.g. inland New South Wales or South Australia) generates 25–30% more output than one in a cloudy area (e.g. southern Victoria or Tasmania). A household that uses most of its solar power (high self-consumption) saves more than one that exports most power at a low feed-in tariff.

Example: A $6,000 system before rebates, after a $1,400 STC discount, costs $4,600 net. If it generates 25 kWh per day (9,125 kWh/year) and you save 70% of that (consuming it immediately or storing it in a battery), you save roughly $900–$1,200 per year on your electricity bill. That system pays back in roughly 4–5 years. After payback, your power is free for 20+ years (typical panel lifespan).

A complete solar installation includes site assessment and roof check, system design, panels, inverter, racking and isolators, installation labour, grid connection paperwork and monitoring app setup. You do not pay extra for these items; they are included in the quoted all-in price.

Solar Accreditation Australia (SAA) accredits solar installers who hold an electrician's licence, complete mandatory training in grid safety and solar design, and comply with the Clean Energy Regulator's audit and record-keeping rules. An SAA-accredited installer's work is eligible for STCs and battery subsidies, meets Australian Standards (AS 4777 for grid safety), and carries full product warranties.

Unaccredited installers may be cheaper, but their work may void your rebates, breach the National Electricity Rules and put your home at risk of electrical fire or grid damage. Always check an installer's SAA accreditation number on the SAA public register (saa.org.au) before you sign a quote. Confirm their current electrician's licence with the electrical licensing body in your state (e.g. SafeWork NSW, WorkSafe Victoria).

Request a free site assessment from an SAA-accredited installer in your area. Bring a recent electricity bill (last 12 months ideally) so the installer can estimate your consumption. After the site visit, you'll receive a written quote that lists system size, component brands, total installed price, STC discount, net out-of-pocket cost, warranty terms and the installation timeline.

Compare quotes from at least two installers and confirm that all include site assessment, system design, labour, grid paperwork and 5-year workmanship warranty. Ask for references and check their reviews. Confirm current STC rates at cer.gov.au and state battery subsidy amounts with your energy agency before you sign. Once you've chosen your installer, they'll arrange your grid connection application; most systems are installed and generating power within 4–8 weeks of your decision.