Essential Questions To Ask Your Broker Before Financing Solar

If you’re thinking about borrowing for solar panels and batteries, the most important step is not picking a brand or installer – it’s nailing the finance. The right questions to your broker will tell you quickly whether funding solar through your mortgage, a personal loan or business finance is smart for you, or a future headache.

This guide gives you a practical question script to use with your broker this week. You’ll cover structure, cashflow, risk, tax and your exit strategy, so you can move ahead with confidence – or decide to save instead.

In one meeting you should be able to answer: Can I afford this? What’s the safest way to structure it? And what’s my Plan B if things change?

If you haven’t chosen a broker yet, use this alongside The Smart Borrower’s Script: 18 Questions To Test Any Broker so you’re confident you’ve got the right person in your corner.

Start by deciding whether borrowing for solar makes sense at all, then compare structures.

1. Start with the big picture: should I even borrow for solar?

Before you dive into product details, you and your broker need to decide whether borrowing for solar is right at all.

1.1 Core decision questions to ask upfront

Ask your broker:

1. “Given my situation, does it actually make sense to borrow for solar, or should I save and pay cash?”
2. “If I borrow, what’s the safest amount, based on my budget and existing debts?”
3. “Where does solar sit in order of priority with my other goals – paying down debt, building savings, investing?”

A good broker will step back and look at:

• Your home loan balance, LVR and equity.
• Existing personal, car or business debts.
• Cash buffer and emergency savings.
• Your job or business stability, especially with Roy Morgan showing over 28% of mortgage holders ‘At Risk’ of stress in 2026.

If they jump straight to “We can just top up your loan” without this discussion, that’s a red flag.

1.2 Ask for a simple yes/no test

Ask:

“What simple test would you use to decide if borrowing for solar is safe for me right now?”

Expect your broker to explain a basic stress test, for example:

• Model your repayments at 2–3% above today’s interest rate (in line with APRA-style buffers).
• Check whether repayments stay under a sensible share of your after-tax income.
• Include all debts – home, cars, cards, business loans.

If adding solar funding pushes you close to mortgage stress thresholds, you may want to reduce the system size, delay batteries, or save instead. For more on working out how much to spend, see What Solar System Really Costs You – And How Much To Borrow.

2. Questions about cost, quotes and how much to borrow

You shouldn’t decide how much to borrow based on the maximum the bank will lend. Start with the actual solar project cost.

2.1 Check the quote, not just the sticker price

Ask your broker:

1. “Can you help me sanity-check these solar and battery quotes before we decide how much to borrow?”
2. “What extra costs should we include – switchboard upgrades, roof work, interest while the system is installed?”

A good broker will prompt you to include:

• Solar & battery hardware and install.
• Electrical upgrades, scaffolding, roof work.
• Potential home insurance changes.
• Any lost solar rebates if you delay.

They don’t need to be a solar engineer, but they should make sure the borrowing amount connects to a realistic project budget.

2.2 Ask for a “cash vs borrow” comparison

Ask:

“Can you show me, in dollars, the difference between paying cash, using a short personal loan, or rolling it into the home loan?”

Insist on a simple table over the life of each option. For example, on a $25,000 solar + battery system:

*Illustrative only – not a quote or live rate.

This shows how stretching solar over 25–30 years can double or triple the interest you pay, even with a lower rate.