How do you pay for home solar in NZ?
Cash, bank green loans and quote terms for the cost to install solar panels in New Zealand, and how to compare a repayment with the bill you expect to cut.
You pay for home solar panels in New Zealand in one of three ways: cash, money you borrow, or a plan where someone else owns the gear for a term. There is no general household rebate that removes the cost to install solar panels. The useful question is which payment leaves you owning a specified system, at a total you can put next to your power bill.
EECA's December 2025 consumer bands are the public scale. A small system is around $8,500 installed (about 3 kW), a medium system around $11,500 (about 5 kW), and a larger system near $20,000 (about 10 kW), before a battery. Those figures include GST and a standard install. Your written quote can sit outside the band because of roof, switchboard, scaffold or storage. Finance that quote, not a national average.
Cash
Cash is the simplest contract. You pay the installer, you own the panels and inverter from handover, and there is no interest. The cost of that choice is the money you no longer have earning interest, or the renovation you delay. EECA notes that its published payback examples do not include financing costs. If you pay cash, simple payback is installed price divided by the annual bill reduction you believe.
For many homes that reduction is in the neighbourhood of $1,000 or more a year when daytime use is real. EECA's Auckland example for a typical 5 kW system is $1,246 a year. A medium system around $11,500 divided by $1,246 is a bit over nine years before export credit and before any extra electrical work. Shaded roofs, night-heavy use, and a large battery stretch that. The worth-it guide sets out who clears that test: https://homesolarinstallation.co.nz/blog/is-solar-worth-it-nz/
Ask the quote for a payment schedule. A normal pattern is a deposit on order, a progress amount before install, and a balance when you have the Electrical Safety Certificate and the documents. Do not pay the last slice while export approval is still unnamed if export was part of what you bought.
Bank green loans and mortgage top-ups
Major New Zealand banks offer home-energy or green loans, often as a mortgage top-up, sometimes at a lower rate for the first years. The product name and the rate change. Ask your own bank what it will lend for solar power installation, what rate applies after the discounted period, what fees apply, and whether the loan is secured on the house.
A secured top-up is usually cheaper than a personal loan or a finance company's zero-deposit deal. It is still a loan. Interest is part of the cost of solar installation even when the installer never mentions it. Put the bank repayment beside the power bill you expect to stop paying. If the repayment is larger than the realistic saving, you are paying for the system faster than it earns, which can be fine if you want the gear, and a poor fit if the only goal was a lower monthly outgoings number.
Borrow against a specified quote. System size in kilowatts, panel and inverter models, inclusions and exclusions should be fixed before the bank draws the money. Financing a monthly repayment figure with no kilowatt size is how people buy a different system from the one they thought they approved.
What to line up before you borrow
Use one comparison sheet. The solar power installation price on that sheet is the all-up figure for your site, not the panel-only price.
| Path | You own the system | Check before you commit |
|---|---|---|
| Cash | Yes, at handover | Deposit, progress payments, what the final payment requires |
| Bank energy or green loan | Yes | Rate now, rate later, fees, security, early repayment |
| Personal loan or retailer finance | Usually yes | Interest and fees versus the bank offer for the same quote |
| Subscription or lease | Often no, until a buyout | Term, exit fee, buyout, who keeps export credits |
Price, GST and exclusions
The solar panel price NZ homeowners compare online is often a hardware price or a national band. Installed cost means panels, inverter, mounting, labour and standard electrical work. Scaffold, a switchboard replacement, asbestos care, traffic management, and a battery are extras until the quote says they are included.
EECA's bands are GST-inclusive briefing figures. A quote that states a price plus GST is a different number from a quote that states a GST-inclusive total. Ask which one you are looking at. The same rule applies to a finance amount: the loan should match the GST-inclusive contract you are signing.
Two quotes for solar electricity installation cost are comparable only at the same kilowatts and the same exclusions. A lower financed price that leaves the board and the scaffold out will not stay lower. The cost guide lists the line items that move a quote: https://homesolarinstallation.co.nz/blog/solar-panel-cost-nz/
Repayments versus the bill
Write three numbers: the all-up price, the annual repayment if you borrow, and a cautious annual saving. Use your own daytime load for the saving, not the sunniest example in a brochure. If you are out of the house until evening, more of the generation becomes export, and export is credited at less than the import rate. The buy-back guide explains that gap: https://homesolarinstallation.co.nz/blog/solar-buyback-rates-nz/
A battery adds cost, often in a band of about $5,000 to $15,000 on top of the array, and it usually lengthens payback. Do not finance storage on day one unless evening use or backup is the reason. EECA's public note is that solar without storage generally gives the better financial return. Details are in the battery guide: https://homesolarinstallation.co.nz/blog/solar-battery-storage-nz/
Check live retailer plans before you lock a savings story that depends on a particular buy-back rate. Powerswitch lists solar rates here: https://www.powerswitch.org.nz/solar-rates
Quote hygiene
Get solar quotes in writing from more than one installer if the first pack is vague. A solar installation quote you can finance names the kilowatts, the annual generation estimate for your roof, the brands, the warranty years on panels, inverter and workmanship, and the exclusions.
Ask who lodges the distributed generation application and who pays any network fee. Ask what the timeline is from deposit to export approval. A loan that starts this month while the system cannot export until next season changes the first year's result. The timeline guide is here: https://homesolarinstallation.co.nz/blog/solar-installation-time-nz/
Home Solar Installation NZ introduces you to a local partner. The form is a free solar panel quote request. There is no obligation to proceed, and you can still take the written scope to your bank or to another installer.
Where the house is changes the extras, not the payment rules
Solar power installation cost for a house in any of these places still starts from the roof, the board and the bill, then you choose cash or a loan: Algies Bay, Arkles Bay, Army Bay, Big Omaha, Coatesville, Dairy Flat, Dome Forest, Dome Valley, Glorit, Gulf Harbour, Hatfields Beach, Helensville, Huapai, Kaukapakapa, Kawau Island, Kumeu, Leigh, Matakana, Muriwai, Omaha, Orewa, Puhoi, Riverhead, Snells Beach, South Head, Waimauku, Warkworth, Wellsford, Bayswater, Belmont, Campbells Bay, Castor Bay, Devonport, Forrest Hill, Hauraki, Milford, Narrow Neck, Stanley Point, Sunnynook and Takapuna. Travel and scaffold show up more often on steep or coastal sites, including Muriwai, South Head, Leigh and Kawau Island, and on tight North Shore streets such as Devonport, Stanley Point and Narrow Neck. Those extras belong in the price you finance.
A home solar quote for Orewa is not a template you can reuse unchanged in Coatesville or Helensville. Same payment rules. Different site. EECA's public cost page is https://www.eeca.govt.nz/for-homes/solar-for-homes/solar-costs-and-savings/ and the planning notes are https://www.eeca.govt.nz/for-homes/solar-for-homes/plan-your-solar-system/