Most people don't have $17,000 sitting in an account waiting for a solar and battery system. So the question we hear after "what does it cost?" is often "can I finance it?", followed by "is the interest-free deal on that flyer real?"
This is a neutral explainer. We're not recommending any lender or product, and we don't quote interest rates, because they change constantly and depend on your circumstances. What we can do is show you how the options differ and how to check whether a loan actually leaves you ahead.
A solar loan is any finance used to pay for solar panels or a battery: a green personal loan, a home loan top-up or green home loan, an "interest-free" solar payment plan, a retailer plan, or an ordinary personal loan. The best option is the one with the lowest total cost, not the lowest weekly repayment. Compare the comparison rate and all fees, check whether the system price has been inflated to fund "interest-free" terms, and only borrow if the repayments sit close to, or below, what the system will realistically save you.
What is a solar loan?
"Solar loan" isn't a single product. It's a label lenders and installers use for several different kinds of credit. Some are designed for energy upgrades and carry a discount. Some are ordinary credit with a solar sticker on them. Some aren't loans in the traditional sense at all, but payment plans arranged through the seller.
The differences that matter are:
- Secured or unsecured. Secured against your home or the equipment usually means a lower rate. Unsecured is simpler but usually costs more.
- Interest, fees, or both. Some products charge interest; some charge no interest but have fees; some do both.
- Who arranges it. Your own bank, a specialist green lender, or the installer or retailer selling you the system.
- The term. Longer terms lower the repayment but raise the total cost.
Types of solar finance compared
| Finance type | How it works | What to watch | Often suits |
|---|---|---|---|
| Green personal loan | A personal loan for eligible energy upgrades, sometimes at a discount to standard personal loans; can be secured or unsecured | Eligibility rules on products and installers; fees; term | People without much home equity, or who want a separate loan |
| Home loan top-up or green home loan | Borrow against your mortgage; some lenders offer a discounted rate for energy upgrades | Paying it off over the full mortgage term can cost more in total interest, even at a lower rate | Homeowners with equity who'll pay it down quickly |
| "Interest-free" solar plan (buy-now-pay-later style) | Arranged through the installer; you repay the price in instalments with no interest | Merchant fees paid by the installer are often built into a higher system price; account and late fees | Only when the finance price matches the cash price |
| Retailer plan | Solar or a battery supplied through an energy retailer and paid off over time, sometimes on your bill | Lock-in to that retailer, exit costs, who owns the equipment, VPP conditions | People happy to stay with one retailer |
| Personal loan | Ordinary unsecured credit used for the system | Usually the highest rate of the mainstream options | Small amounts, short terms |
The federal Household Energy Upgrades Fund
The best-known government-backed finance option open to Queenslanders as at October 2026 is a federal one.
Under the $1 billion Household Energy Upgrades Fund, the Clean Energy Finance Corporation (CEFC) works with participating lenders to offer discounted finance for home energy upgrades, including solar PV and home batteries (energy.gov.au). According to the Australian Government:
- products can include green home loans, green personal loans and other low-cost finance
- it's open to households with or without a mortgage, rental property owners and strata properties
- high-value properties are excluded
- installations must be done by accredited installers, and products must meet eligibility requirements, such as panels, inverters and batteries on the Clean Energy Council approved lists
The list of participating lenders is on the energy.gov.au and CEFC websites. Eligibility and pricing are set by each lender, so speak to them directly.
State programs are a different story. Queensland has had solar and battery finance schemes in the past, and programs do open and close. Check the current position on our QLD solar and battery rebates page and with the Queensland Government before relying on any state offer.
Rebates reduce how much you need to borrow
Two federal discounts come off the price before finance even comes into it, because the installer applies them at the point of sale:
- STCs on solar panels. The Small-scale Renewable Energy Scheme discount is already built into a solar quote. It scales with system size and location, and it falls each year until the scheme winds up at the end of 2030.
- The Cheaper Home Batteries Program on batteries. Since 1 May 2026, it's been worth about $252 per usable kWh, or roughly $2,520 on a 10 kWh battery, applied upfront by the installer. It steps down every six months.
So the amount you finance should be the net price after those discounts. If a finance offer is calculated on a price that doesn't show the rebate clearly, ask why.
Does a solar loan pay for itself?
This is the test that matters. Compare what the system saves you each year with what the loan costs you each year.
Using our published Sunshine Coast figures (as at August 2026):
| Figure | |
|---|---|
| 6.6 kW solar (STCs deducted) | About $6,000 |
| 10 kWh battery after the federal rebate | About $10,980 |
| Combined example | About $16,980 |
| Typical savings, solar and battery together | Up to about $2,500 a year |
| Typical payback, combined example | 7 to 14 years |
Now some simple arithmetic, deliberately ignoring interest:
- Repaying $16,980 over 7 years at zero interest is about $202 a month, or about $2,426 a year.
- Over 5 years it's about $283 a month, or about $3,396 a year.
At the top of the savings range, a seven-year zero-interest repayment roughly matches what the system saves. Any interest, any fees, or lower savings, and the repayments are higher than the savings for the life of the loan. That doesn't make finance a bad idea. It means you should go in expecting the system to pay for itself over its life, not from week one.
For solar on its own, the numbers are friendlier because the system is cheaper. A properly sized solar system commonly takes a large share off the bill, which is why solar alone is often the easier system to justify with finance. Our article on solar investment ROI covers the economics in more depth, and solar battery cost on the Sunshine Coast breaks down battery pricing.
A rule of thumb we'd use: if the loan only works because you've assumed the best-case savings and a long term, it's too tight.
Is interest-free solar really interest free?
Often the interest has just moved. With buy-now-pay-later style solar plans, the finance provider usually charges the installer a merchant fee. That cost has to come from somewhere, and it usually comes from a higher system price, cheaper components, or both.
How to check:
- Ask for the cash price and the finance price, in writing, for the identical system. Same panels, same inverter, same battery, same installation.
- If the finance price is higher, the difference is your interest. Work out what it is as a share of the cash price and compare it with an ordinary loan.
- Check the fees. Establishment, monthly account-keeping, payment processing and late fees can add up over a few years.
- Compare the components. If the "interest-free" quote has a different panel or inverter brand from the cash quote, you're not comparing like with like.
Interest-free can be genuinely good value when the finance price matches the cash price. You just need to see both.
What about no deposit solar?
"No deposit" only means you don't pay anything upfront. It says nothing about the total cost. A no-deposit offer can be fine, or it can be a long, expensive loan on an inflated price. Apply the same tests: total cost over the term, comparison rate, fees, and the cash price for the same system.
Checklist before you sign any solar finance
- Comparison rate, not just the headline rate. In Australia the comparison rate rolls in most fees and charges, so it's a fairer way to compare loans.
- Every fee: establishment, monthly, early repayment, late payment.
- Total amount repayable over the full term.
- Secured or unsecured, and what it's secured against.
- Early repayment. Can you pay it off faster without a penalty?
- The system itself. Panel, inverter and battery models on the CEC approved lists; a CEC-accredited installer, which the rebates require anyway.
- Who you'll deal with if something goes wrong, the installer or the finance company.
When you're comparing quotes, our guide to comparing solar quotes goes through each line.
Red flags with solar finance
- The price is only quoted as a weekly figure. Ask for the total.
- Pressure to sign on the day, especially at the door. For unsolicited sales, such as door-to-door, Australian Consumer Law gives you a 10 business day cooling-off period, and the seller can't take payment during it (ACCC).
- "Free" panels or "government-funded" systems that turn out to be a long contract.
- No cash price available.
- Finance conditions that lock you into a retailer or a VPP you haven't chosen.
Cash, loan or wait?
If you have the cash and it's earning little, paying cash avoids interest and fees entirely. If you'd be borrowing, a discounted green loan or a mortgage top-up you'll repay quickly is usually cheaper than a personal loan. And if the numbers only work on optimistic assumptions, a smaller system now, with room to add a battery later, is often the better path.
Whichever way you pay, size the system to your actual usage first. Our residential solar page shows what we install and how we size it.
Frequently asked questions
Is it worth getting a loan for solar panels?
It can be, if the repayments are close to what the system saves and the total cost is reasonable. Solar on its own is usually easier to justify with finance than a large battery. Compare the total repayable with realistic savings, not best-case ones.
What is a green loan for solar?
A green loan is finance for eligible energy upgrades, such as solar panels, batteries and efficient appliances, often at a discount to the lender's standard rate. In Australia, the federal Household Energy Upgrades Fund works through participating lenders to offer discounted green home loans and green personal loans.
Is interest-free solar really interest free?
Not always. Interest-free solar plans usually charge the installer a merchant fee, which is often built into a higher system price. Ask for the cash price and the finance price for the identical system. If they differ, the difference is effectively your interest.
Can I get finance for a solar battery?
Yes. Green loans, home loan top-ups, personal loans and some installer or retailer plans can be used for batteries. The federal battery rebate is applied by the installer at the point of sale, so you should only be financing the price after the rebate.
Can I add solar to my home loan?
Many lenders let you top up a mortgage for home improvements, and some offer discounted green home loan products for energy upgrades. A mortgage rate is usually lower, but repaying over the full mortgage term can cost more in total interest, so pay it down faster if you can.
Do I still get the rebates if I use finance?
Yes. STCs on solar and the Cheaper Home Batteries Program on batteries are applied by the installer as a discount at the point of sale, regardless of how you pay. The system and installer still have to meet the eligibility rules.
