Solar Panel Finance: What It Costs and How to Pay for It

Solar panel finance comes down to two numbers: what a system costs after government discounts, and what borrowing the rest adds to the payback. The quote lands bigger than the ad, which is where many Australian households stall. The upfront figure and the one you actually pay are different, and the gap is schemes plus how you fund the rest.

What a home solar system costs and what it gives back

The Australian Government's Solar Consumer Guide works through a household example worth borrowing. A 6.6 kW solar-only system costs about $7,000 and saves around $1,600 in an average year through self-consumption and export, which pays the system off in roughly 4.4 years. Add an 8 kWh battery and the same household is looking at about $22,000 for around $2,100 a year in savings, or a payback of about 10.5 years.

Those figures are an illustration rather than a quote, and your own numbers will vary with your roof, your climate zone and how much power you use during daylight.

The shape of the answer holds up though. Panels on their own are the faster financial win. The guide makes the point directly: if the battery carries a 10 year warranty, a solar and battery system may not be paid off before that warranty expires.

Self-consumption is where solar makes its money

Every kilowatt-hour you use while the sun is shining is a kilowatt-hour you do not buy from your retailer. Anything you do not use is exported to the grid and earns a feed-in tariff instead, and feed-in tariffs are typically well below the rate you pay to buy electricity back. If your system has an export limit set by your distribution network, generation above that limit is curtailed and earns you nothing at all.

The practical consequence is that running the dishwasher, the washing machine and the pool pump in the middle of the day is worth more than adding another panel. Size the system to your daytime habits, not to your total annual bill.

The federal discount is already in your quote

Most people go hunting for a solar rebate to claim after the fact. It is generally already sitting in the price. The Small-scale Renewable Energy Scheme issues small-scale technology certificates, known as STCs, for eligible rooftop systems.

Your retailer or installer normally applies for them and sells them on your behalf, then shows the value as a discount on your quote.

Two conditions decide whether you qualify. The system has to be installed by a Solar Accreditation Australia accredited installer, and the panels and inverter have to appear on the Clean Energy Council approved lists. Miss either and the discount goes with it.

How many certificates you receive depends on your system size, up to 100 kW, and your climate zone. The Clean Energy Regulator issues STCs based on how much power the system is expected to generate until the scheme ends in 2030, so each year you wait earns the same system a smaller discount.

Batteries have their own arrangement. Since 1 July 2025 the Cheaper Home Batteries Program has provided a discount of around 30% on the upfront cost of installing an eligible small-scale battery, delivered through the same scheme and generally applied by the retailer.

State schemes stack on top of the federal one

Victoria shows how much difference this makes. Eligible Victorian households can receive a rebate of up to $1,400 towards a solar PV system, subject to being an owner-occupier with combined household taxable income under $150,000, a property valued under $3 million, and no solar PV installed at the address in the past 10 years.

Solar Victoria also offers an interest-free loan matching the rebate, up to $1,400, repaid monthly over 4 years. On the full amount that works out to $29.17 a month.

Other states, territories and some councils run their own rebates and loans, and they change over time. Check what is open where you live before you accept a quote, since eligibility usually has to be approved before installation.

Solar panel finance options, compared

The Solar Consumer Guide says it plainly: if you borrow to fund your system, your payback period will probably be longer than if you pay the upfront cost yourself. That is not an argument against borrowing. It is an argument for doing the sum.

On the guide's own example, it looks like this. The Reserve Bank's average rate on new fixed-term personal loans was 9.40% in July 2026. Borrow the $7,000 at that rate over 5 years and the repayment is about $147 a month, roughly $8,800 in total, of which about $1,800 is interest.

The projected saving of $1,600 a year is about $133 a month, so while the loan runs it costs slightly more each month than the panels save, and payback moves from 4.4 years to about 5.5. Once the loan is cleared, the full saving is yours.

Your rate will depend on the lender and your circumstances, and a green loan or state interest-free loan changes the sum again. Subject to lender approval, terms, and conditions apply.

Keep a retailer's interest-free offer separate from a government interest-free loan. Only one of them is capped and administered by a scheme, and where a retailer's interest-free price sits above the cash price, the interest has been moved into the system cost rather than removed.

What to do next

Get three written quotes from authorised retailers, and make sure each one itemises the STC discount. Ask what system size each quote assumes and why, then check the panels and inverter against the Clean Energy Council lists yourself.

Once you know which scheme you qualify for, compare the total cost of each finance option over its full term, including fees, against the annual bill saving the quote projects. A cheaper monthly repayment over a longer term can cost more than a higher one over a shorter term.

Ready to make it happen? Emu Money compares solar panel finance options across 50+ lenders, so you can see what a solar system costs you each month before you commit to a quote. Compare home renovation loan options.