There is no single reliable price for residential solar panels in Australia. Installed cost depends on system capacity, equipment, roof access, switchboard work, distribution-network requirements, retailer margin, location, and the value of small-scale technology certificates, or STCs, applied to the project.
Compare the gross price, STC assignment, final cash price, and financing separately. A headline “after rebate” amount can hide equipment or work that another quote includes.
How STCs reduce the quoted price
Eligible small-scale solar systems can create STCs under the Australian Government's Small-scale Renewable Energy Scheme. The number depends on factors including rated capacity, installation zone, and remaining deeming period.
Most households assign the right to create certificates to a registered agent, often through the solar retailer, in return for an upfront discount. The discount is commercial and depends on certificate value and agent arrangements.
The quote should show the number of STCs, assigned value, fees, and final payable amount. Read Australia Solar Panel Rebates and STCs for eligibility and assignment details.
System size and total price
Larger systems cost more in total but can cost less per installed kilowatt because design, sales, permitting, and crew costs are spread across more panels.
The right size depends on annual and interval electricity use, available roof, future EV or electric-appliance loads, feed-in tariff, network export limit, budget, and expected production.
A common 6.6 kW label is not a universal recommendation. Homes with three-phase supply, batteries, high daytime demand, or constrained exports may need a different design.
Price per watt
Divide the final comparable solar-only cash price by panel capacity in watts. Confirm whether the numerator is before or after STCs and whether it includes a battery, switchboard, difficult access, meter work, or other upgrades.
Price per watt is useful only when project boundaries are equal. A cheaper quote may exclude scaffolding, tile replacement, switchboard remediation, export-control hardware, or post-installation support.
Panels and inverters
Higher-efficiency panels can fit more capacity on a limited roof. Inverters differ in architecture, shade response, monitoring, battery compatibility, and service pathway.
Record exact model numbers and check that equipment appears on the applicable approved-product lists for scheme eligibility. Compare product warranties, performance terms, local support, labour coverage, and replacement access.
Do not select solely by panel wattage or a long warranty headline.
Roof and installation conditions
Steep or fragile roofs, multiple faces, difficult access, structural issues, tile condition, asbestos, long cable routes, and extensive shading can increase cost.
If roof replacement is likely during the system's life, coordinate it first. Removal and reinstallation later can be expensive.
Ask whether the quote follows an on-site assessment and what can change after detailed design.
Switchboard, phase, and metering work
Older switchboards may need safety, capacity, or compliance upgrades. Single-phase and three-phase connections affect inverter design and network limits.
A smart meter may need configuration or replacement for solar exports and time-of-use data. Retailer and distribution-network processes differ.
The contract should state included electrical work and how unexpected remediation is priced.
Connection and export limits
The distribution network service provider sets connection and export conditions. An inverter may be allowed at one capacity while exports are capped lower.
Static or dynamic export control can add compatible hardware, communications, commissioning, and design requirements. Curtailed generation earns no feed-in credit.
Use Australia Feed-In Tariffs and Export Limits before valuing a larger array.
Location and installer economics
Freight, travel, labour availability, network process, wind or corrosion conditions, and access can make regional projects cost more. Remote service also matters during faults.
Compare Solar Accreditation Australia accreditation and required electrical licences, retailer consumer-code participation where relevant, business history, subcontracting, and warranty response.
A sustainable service model can justify some price difference.
Financing
Request the cash price even if financing. Compare amount financed, interest, fees, term, total repayment, security, and early payout.
Interest-free government loans, where available, have eligibility and program conditions. Commercial “no interest” offers can embed cost in the system price.
Separate equipment value from the financing product.
Estimate savings with tariffs, not averages
Savings depend on:
- Solar production by time and season.
- Direct self-consumption.
- Retail usage rates.
- Daily supply charge.
- Feed-in tariff and export volume.
- Time-of-use or demand charges.
- Curtailment from export limits.
- Degradation and maintenance.
- Financing cost.
Feed-in tariffs are generally lower than retail import rates, so using solar onsite often has greater value than exporting it.
Compare electricity plans after solar
The retailer may move the property to another plan after solar connection. A high feed-in tariff can be paired with higher usage or supply charges.
Compare the complete bill using Energy Made Easy where available, Victorian Energy Compare in Victoria, or the relevant regulated source in areas without retail choice.
Recheck plans after a full year of solar data.
Quote worksheet
Record:
- Gross installed cash price.
- STC quantity and assigned value.
- Final cash price.
- Panel capacity and inverter capacity.
- Exact equipment models.
- Annual and monthly production.
- Network connection and export limit.
- Switchboard, meter, access, and permit scope.
- Product and workmanship warranties.
- Financing total repayment.
Cost is site-specific
National averages cannot price a roof or network connection. A sound Australian solar decision uses multiple current local quotes, transparent STC treatment, network-approved design, and bill modelling based on the household's actual tariff.
Continue through the Australia Home Solar Hub and How to Compare Solar Quotes.