Paying for Solar in NZ: Cash vs Green Loans vs Personal Loans (2026)

The opportunity cost

If you have $15,000 sitting in savings, here is what it could earn you over 5 and 10 years compared to putting it all into solar upfront.

Solar savings are tax-free. Investment returns are not. A $2,000/year solar saving is equivalent to earning about $2,780 pre-tax in an investment account.

Property value uplift

• NZ data shows homes with solar sell for 3 to 4.4% more than comparable homes without it.
• On a $700,000 home, that is a $21,000 to $35,000 premium.
• The system pays for itself AND adds equity to your property.

[1] The post-term rate trap

• ANZ/ASB revert to ~5.79% floating after the 3-year fixed period ends.
• BNZ reverts to ~8.69% floating. Significantly worse.
• Westpac reverts to 5%. Still the best of the lot.
• If you have not paid off the loan within the fixed period, your monthly payment jumps dramatically.

Pro tip: Set up automatic payments calculated to clear the full balance within the fixed period. Do not rely on minimum payments.

[2] Quote expiry catches you out

Get your loan pre-approved first, then get the installer quote. Not the other way around.

[3] Break fees if you sell or refinance

• 1% fixed loans have break fees. They are small but real.
• Westpac 0% has NO break fees. Another reason it is the best option.
• If you move banks to get a better mortgage deal, break fees apply to the green loan portion.

[4] Your installer goes bust

• Product warranty (from the manufacturer) survives. Workmanship warranty does not.
• The Consumer Guarantees Act lets you claim against the manufacturer or importer directly.
• SEANZ membership provides some protection.
• This is why choosing a vetted, established installer matters more than saving $500 on a quote.

[5] Insurance: you must notify your insurer

• Roof-mounted panels are covered under your existing home insurance policy.
• You MUST update your sum insured to include the system value.
• Failure to notify your insurer means the panels may not be covered if something goes wrong.
• Premium increase is modest, roughly $20 to $30 per year.

[6] Meter upgrade is not always free

• An import/export meter costs approximately $150 to $195.
• Some retailers cover it. Others pass the cost to you.
• It takes 3 to 5 weeks to arrange.
• This cost is not included in most installer quotes, so budget for it separately.

Small systems under $8,000

Monthly savings from a small system are too low (roughly $800 to $1,200 per year) to justify the complexity of a loan. If you can afford to pay cash for a system this size, do it.

Selling within 2 to 3 years

Solar payback is 5 to 8 years. If you sell before breakeven, you are unlikely to recoup the full cost through the sale price premium. Break fees add cost at sale too.

Exception: Westpac 0% with no break fees, combined with the property value uplift, can still work if you are selling in the medium term.

Power bill already under $150/month

With savings of only $1,000 to $1,200 per year, the payback period stretches to 10+ years. Financing costs erode those thin savings further. Solar may still be worth it for environmental reasons, but the financial case is weaker.

No mortgage

You cannot access green loans. They are all structured as mortgage top-ups. Personal loans at 8 to 13% make solar significantly more expensive. Some banks may open a small mortgage specifically for the purpose, but this adds complexity and fees.

Already stretched on debt

CCCFA affordability rules may mean you are declined anyway. Adding debt when you are already tight is risky regardless of the long-term savings. Solar saves money over years, but it will not fix short-term cash flow problems.

Cooling-off periods

• 5 working days if you signed in person.
• 7 working days if the contract was sent by email.
• 9 working days if the contract was sent by post.

You can cancel the credit contract in writing during this period. Note that buy-now-pay-later purchases do not have a cooling-off period.

CCCFA protections

• Banks must assess affordability. They cannot lend if repayments would cause substantial hardship.
• All terms, rates, and fees must be clearly disclosed before you sign.
• Green loans must state what rate applies after the promotional period ends.

Consumer Guarantees Act

• Solar installation is both goods and services. Both are covered.
• The system must be of acceptable quality and fit for purpose.
• These rights cannot be contracted out of.
• Resolution path: installer first, then manufacturer, then the Disputes Tribunal.

What's the cheapest way to pay for solar in NZ?

Westpac’s 0% Greater Choices loan for 5 years. You pay exactly the system price with zero interest and no fees. If you are not a Westpac customer, ANZ and ASB at 1% for 3 years cost just $232 in interest on a $15,000 system.

Can I get a green loan without a mortgage?

No. All NZ bank green loans are mortgage top-ups requiring an existing home loan. Without a mortgage, your options are cash, personal loan (7.99%+), or establishing a small mortgage specifically for the purpose, which adds complexity.

What happens to my green loan if I sell the house?

The loan is repaid from sale proceeds like any mortgage. If you are on a fixed 1% rate and sell mid-term, you may face break fees. Westpac’s 0% loan has no break fees, making it the best option if you might sell.

Should I pay cash or take the 0% loan?

Take the loan. Put your cash in a term deposit earning 3.70%. You earn ~$1,238 in interest over 3 years while paying $0 in loan interest, AND you get $6,000+ in solar savings. There is no mathematical reason to pay cash when 0% financing exists.

What if my bank doesn't offer a green loan?

Switch banks, or check if your bank has recently launched one. Most major NZ banks now offer green loan products. Alternatively, take the best personal loan rate you can find and plan to pay it off as fast as possible to minimise interest.

Will solar panel prices drop if I wait?

No. Prices rose 9% in Q4 2025 and are forecast to increase another 10 to 30% in 2026 as China tightens production. Every month you wait, you are paying full retail power prices AND facing potentially higher panel costs. The best time to buy was last year. The second best time is now.