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Should You Add Solar To Your Home Loan Or Refinance Instead?

Clear, numbers-based guide to whether you should top up your current mortgage or fully refinance to fund solar panels and batteries in Australia.

3 Aug 2026Updated 16 Sept 2026Reviewed 16 Sept 20265 min read

Key Takeaway

Australian borrowers can fund solar panels either by topping up their current home loan or refinancing to a new lender, and the best choice depends on rate differences, fees and equity. Keeping solar costs in a separate 5–10 year loan split can cut interest on that portion by more than half compared with blending it into a 25–30 year mortgage. The actionable step is to compare total dollars of interest and fees over time and only refinance if the benefits clearly outweigh costs within a practical timeframe.

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Maxed Out on Your Residential Borrowing Capacity?

While you compare topping up or refinancing for solar, this video explains what to weigh up when your home loan borrowing is already maxed out.

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General information only, not personal advice. Your situation is assessed before any recommendation.

Should You Add Solar To Your Home Loan Or Refinance Instead?

You can usually add solar panels to your home loan either by topping up your existing mortgage or by refinancing to a new lender and including the solar cost in the new loan. The smarter choice comes down to: 1) how competitive your current rate is, 2) how much equity you have, and 3) whether refinancing costs are clearly outweighed by interest and power-bill savings within a few years.

Here’s how to decide, with numbers you can check this week.

Solar panels on Australian home roof with mortgage figures overlay Compare top-up versus refinance options before adding solar to your home loan.

Option 1: Top up your current home loan for solar

A home loan top-up (equity release) means your existing lender increases your limit to cover the solar system and/or batteries.

In practice, you might:

  • Add $15,000–$40,000 to your current loan; and
  • Keep total lending at or under 80% LVR to avoid LMI where possible.

When a top-up is usually better

A top-up tends to win when:

  1. Your current rate is still sharp (within ~0.30–0.50% of strong new-customer offers).
  2. Refinance fees would eat most of the benefit.
  3. You value speed and low admin – same lender, same direct debit, same portal.

If your rate is pretty competitive already (or you’ve just negotiated a repricing), topping up avoids discharge, new application and government fees.

Structure the solar cost in a separate split

Avoid stretching a 15–20 year asset over a 30-year mortgage.

Instead, ask your lender or broker to:

  • Set up a separate loan split for the solar and batteries; and
  • Put that split on a 5–10 year principal-and-interest term.

Existing research across this content hub shows that keeping solar in a separate 5–10 year split can more than halve total interest on that component versus blending it into a 25–30 year loan, even at the same rate.

Example (indicative only):

  • $25,000 solar top-up at 6.5% p.a.
  • 30-year term: repayment ≈ $158/month; total interest ≈ $32,800.
  • 7-year term: repayment ≈ $372/month; total interest ≈ $6,200.

Same rate, massively different interest. The trade-off is higher monthly repayments, so you must check cashflow and mortgage-stress risk.

If you’re also a first-home buyer, it’s worth planning the structure up-front so your initial purchase and later solar plans don’t compete for your limited borrowing power – see /insights/first-home-buyer-grants-schemes-solar-funding.

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Frequently asked questions

Is it cheaper to add solar panels to my existing home loan or refinance?▾
It depends on how competitive your current rate is and what it would cost to switch. If your present rate is close to market and your lender will offer a reasonable top-up, it’s often cheaper and simpler to add a separate solar split. Refinancing only tends to win when you can drop your rate meaningfully on a large loan and the savings clearly outweigh switching costs within a few years.
How long should I set the loan term for solar panels on my mortgage?▾
Aim to keep solar and batteries in a separate 5–10 year principal-and-interest split, even if your main home loan has 25–30 years remaining. This lines up the loan term with the useful life of the system and can more than halve the total interest on that portion compared with rolling it into a 30-year mortgage.
Will adding solar to my home loan push me into mortgage stress?▾
It might, which is why you should model repayments at interest rates 3% higher than today and compare them to your after-tax income. If total home loan repayments would exceed roughly one-third of your take-home pay at that higher rate, consider a smaller system, a longer (but still short) solar split, or delaying the upgrade until your income or buffers improve.

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