Article
Smart Ways to Bundle Solar Funding Into Your Next Refinance
How to use a refinance to fund solar and batteries safely, with the right loan splits, terms and lender strategy – and where a broker actually adds value this week.
Key Takeaway
Australian borrowers can bundle solar and battery funding into a refinance by increasing their home loan and placing the solar costs in a separate 5–10 year principal-and-interest split while keeping the main mortgage on a standard term. This approach, typically up to 70–80% LVR, leverages home loan rates without spreading a 10–15 year asset over 30 years. Using a mortgage broker helps compare lenders, model repayments at current rates plus 3%, and keep total repayments under about 30–35% of after-tax income.
This topic is covered in full on Tailored Loans Sydney
How to use a refinance to fund solar and batteries safely, with the right loan splits, terms and lender strategy – and where a broker actually adds value this week.
Read the full guide on tailoredloans.sydneyBundling solar into a refinance means increasing your home loan to cover solar and battery costs, then structuring that extra borrowing – ideally as a separate, shorter‑term split – so you use home loan rates without paying 30 years of interest on a 15‑year asset. A good mortgage broker’s job is to test if this is safe for you, compare lender options and design a structure that keeps cashflow controlled even if rates rise.
Here’s how to make a decision you can act on this week.
1. What “bundling solar into a refinance” really means
One transaction, multiple purposes
When you refinance and fund solar at the same time, you’re really doing three things in one hit:
- Paying out your existing home loan with a new lender (or restructure with your current lender).
- Increasing the total loan to cover solar and any other upgrades.
- Setting up internal loan splits so each purpose has its own term and repayment plan.
The broker’s role is to align all three with your risk tolerance and timeline, not just squeeze in the biggest possible amount.
Typical structures a broker will consider
| Structure option | How it works | Pros | Cons |
|---|---|---|---|
| Single blended 30‑year loan | Solar cost added to main home loan term | Simple, lowest minimum repayment | Highest total interest on solar portion |
| Separate 7–10 year P&I solar split | Solar in its own split with shorter term | Matches asset life, much lower total interest | Higher repayment on that split |
| Separate variable split, aggressive extra pay | Variable solar split, target extra repayments from bill savings | Flexibility to pay off early, easy to track savings | Discipline required; rate can move |
| Mix of fixed + variable splits | Some splits fixed, some variable | Balance of certainty and flexibility | More complex; break costs possible on fixed portion |
For solar, keeping costs in a separate split with a 7–10 year term can more than halve total interest versus a 30‑year term, while still leveraging home loan rates (see also /insights/questions-to-ask-broker-before-borrowing-for-solar and related guidance).
2. What your broker will check before bundling solar
2.1 Equity and LVR limits
Most mainstream lenders are comfortable up to 80% loan‑to‑value ratio (LVR) without lenders mortgage insurance (LMI). Some will go to 90–95% with LMI, but that’s rarely sensible just for solar.
Your broker will usually:
- Order a valuation (or use automated tools if available).
- Check that your post‑refinance LVR sits in a safe band – often 70–80% for this strategy.
- Keep extra headroom if you’re self‑employed or have variable income.
For deeper numbers on how much you can safely borrow for solar using equity, see /insights/how-much-can-i-borrow-solar-panels-batteries-using-equity.
2.2 Serviceability and mortgage stress
A good broker won’t just look at today’s required repayments.
They will:
- Run serviceability at a rate at least 3% above the actual product rate (in line with APRA’s buffer guidance).
- Aim to keep total mortgage repayments under roughly 30–35% of after‑tax household income, recognising that Roy Morgan’s ‘At Risk’ mortgage stress definition kicks in once repayments exceed 25–45% of income.
- Stress‑test both the home loan and the solar split together, because the bank will treat it as one overall exposure.
If the solar borrowing pushes you towards stress, the answer might be: don’t borrow yet – or borrow less and stage the upgrade.
2.3 Comparing refinance vs alternative solar finance
Your broker should compare at least three pathways:
- Refinance + solar split (home loan rate, 5–10 year term).
- No refinance + top‑up with your existing lender.
- Separate green loan or installer finance (shorter term, usually higher rate but quarantine from your home loan).
The right answer depends on your rate, remaining loan term, planned move/upgrade timeline and how tight your cashflow is.
The strategy continues below
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