The Homeowner's Advocate

NZ Solar Centre exists for one reason: to put the New Zealand homeowner back in charge of the solar buying decision. The residential solar industry in Aotearoa has been shaped for decades by direct-to-door installers, opaque quoting, glossy "power forever" claims, and pressure-cooker sales meetings that end with a contract on the kitchen table. We think that's the wrong way round. The homeowner should hold the information, the leverage, and the timing. We sit on your side of the table. We do the maths, name the traps, vet the installers, and hand you the numbers in plain English so you can make a decision that still looks smart in twenty years. That's the whole job. This pillar page is the front door to that work, and every cluster below it is a deeper look at one part of how we do it.

If you've landed here for the first time, welcome. Pull up a chair. This is the part of the website where we set out our stall, the manifesto if you like, before pointing you toward the specific tools and articles that will help you most. Read it through once, then dip into the linked resources that match where you are in your decision.

Why We Exist: The Old Model Is Broken

The traditional New Zealand solar sales process looks something like this. A homeowner clicks an ad, a sales rep calls within ten minutes, an appointment is booked for that evening, the rep arrives with a tablet and a "today only" discount, and two hours later there's a finance application on the kitchen bench. The system, panels, inverter, battery, and warranty terms are all chosen by the seller, not the buyer.

That model survives because solar is complicated and most homeowners only buy a system once in their lives. The information asymmetry is enormous. The installer knows the margin on every component, the realistic generation figures for your region, the buy-back rates across retailers, and which finance products carry hidden fees. You know roughly what your power bill is and that you'd like it to be lower.

We think that imbalance is the single biggest reason New Zealanders end up with the wrong sized system, the wrong battery, or the wrong finance package. Not because installers are villains, plenty are excellent, but because the **default sales structure rewards speed over fit**. NZ Solar Centre is the counterweight. We're the friend you ring before the rep arrives.

The Trust Proxy: What We Actually Promise

"Trust proxy" is a phrase you'll see across this site. It means we stand in for the trusted neighbour, builder mate, or sparkie cousin that not every homeowner has on speed dial. When you don't have someone in your life who's already been through this, we want to be the next best thing.

Our promise has four parts:

• We never take a clip from the install. Our revenue comes from advertising and from charging vetted installers a flat referral fee to be on our panel. Whether you buy a 3 kW system or a 10 kW system with batteries, it makes no difference to us.
• We publish the maths. Every claim, payback figure, or savings estimate links to its source: EECA, MBIE, the Electricity Authority, Consumer NZ, or the retailer's own published tariff page.
• We name names when something is dodgy. If a sales tactic, finance product, or component spec is harmful to homeowners, we say so plainly. See the Solar Scam Checklist for the longer list.
• We protect your data. Your details aren't a product. The full detail of how we handle your information is on our Privacy Act compliance page.

You can read the full version of our promise on our Trust Proxy commitment page. The short version: we'd rather lose a referral fee than let a homeowner sign a bad contract.

The Number 8 Wire Spirit, Applied to Energy

There's a phrase that gets used a lot in New Zealand: Number 8 wire. It comes from the fencing wire farmers used to fix anything that needed fixing, an icon of practical, resourceful problem solving. Tractor broken? Number 8 wire. Gate latch knackered? Number 8 wire. The spirit is what matters: look at what you've got, work out what's needed, build the thing yourself if you have to.

That's how we think about residential solar. You don't need a huge battery wall, a luxury inverter, and a finance plan that runs for fifteen years to make solar work on a Kiwi roof. You need the right kit, properly sized, installed by a sparkie who knows what they're doing, on a roof that gets enough sun. The rest is marketing.

The Number 8 wire approach to solar means asking simple questions. Will this system pay for itself in a reasonable time? Will the gear still be working in fifteen years? Does the installer answer the phone when something goes wrong? Is the finance honest? Everything else is a distraction.

The Bach Test

We use what we call the bach test internally. Would this system make sense at a Coromandel bach, where you can't pop down to the shop for a fancy replacement part, and where the owner wants the thing to work for twenty years with minimal fuss? If the answer is yes, the system is honestly designed. If it only makes sense with constant app monitoring, premium service contracts, and a sales rep on call, something has been over-engineered for margin.

What "Advocacy" Looks Like in Practice

It's easy for a website to say it's on your side. Plenty do. The proof is in the tools, the editorial choices, and the things we refuse to do. Here's what advocacy looks like in our day-to-day:

1. We Built Calculators That Tell the Truth

Our Solar System Cost & ROI Calculator uses NIWA irradiance data for your specific region, your actual retailer's import and export tariffs, and the current installed cost ranges from real NZ quotes. It doesn't assume a 15c export rate or a five-year payback to make solar look better than it is. It tells you what you'll actually save, and what your honest payback period looks like.

The Dynamic Tariff & Buy-Back Engine compares every major NZ retailer's residential solar plan side by side, including time-of-use windows from Octopus NZ, peak/off-peak structures from Contact and Mercury, and the flat-rate options from Genesis and Meridian. We update it as retailers change their pricing pages.

The Green Finance Qualifier Tool tells you whether you'd likely qualify for the 0-1% green loan products from Westpac, ANZ, BNZ, or Kiwibank, and how that finance compares with paying cash or extending the mortgage.

2. We Vet Installers Properly

Our 13-Step Installer Vetting Process is the spine of the referrals service. Before any installer appears on our panel, they pass a check that covers SEANZ membership, electrical worker registration with the EWRB, manufacturer accreditation for the panels and inverters they sell, evidence of completed installs in the homeowner's region, a clean record with the Commerce Commission, and direct customer references we can ring.

An installer who has bought their way onto a comparison site is not the same as an installer who has passed an independent vetting process. We think that distinction matters.

3. We Refuse Money When It Compromises the Reader

We've turned down advertising deals from installers and finance providers whose sales practices don't pass our standard. We've also pulled affiliate links from products that performed badly in NZ conditions. This costs us money. We think it builds the only thing that matters: a homeowner reading this in 2027 still finding it useful and honest.

The Articles in This Silo

This pillar is the top of the Brand Trust silo. Below it sit several cluster articles, each one a deeper look at how we act as your advocate. Here's the map:

Our Promise: The Trust Proxy

The Trust Proxy: Our Promise to NZ Homeowners is the full version of our editorial standards, conflict-of-interest policy, and how we make money. If you want to know whether to trust the figures on this site, start there.

The Solar Scam Checklist

The Solar Scam Checklist: How to Avoid Shady Installers names the specific tactics we see used on New Zealand kitchen tables, including the "today-only" discount, the no-deposit system that's actually a fifteen-year finance lock-in, the inflated savings spreadsheet, and the missing SEANZ accreditation. Read this before you take a meeting.

Our 13-Step Installer Vetting Process

Our 13-Step Installer Vetting Process walks through, in order, every check we run on an installer before they're allowed near a homeowner who came through us. It also doubles as a checklist you can use to assess any installer, even one you found yourself.

How We Protect Your Data

How We Protect Your Data (Compliance with the Privacy Act 2020) covers exactly what we do with your name, address, email, and power bill data when you use our tools or request quotes. Spoiler: we don't sell your details to a marketing list. Ever.

The Numbers That Actually Matter for NZ Homeowners

Before we get into the persona-specific guidance, here are the figures we think every Kiwi solar buyer should have in their head. These are the numbers that drive every honest decision in this space.

• Average residential system size: 5-8 kW is the typical install for a three or four bedroom home in most regions, per EECA's solar guidance.
• Realistic generation: A 6 kW system in Auckland generates roughly 8,000-9,000 kWh per year. In Christchurch, more like 8,500-9,500 kWh thanks to clearer skies. Dunedin closer to 6,500-7,500 kWh. NIWA solar irradiance data confirms these regional differences.
• Self-consumption rate without a battery: Typically 30-40% for a working family who's out during the day. With a battery, you can push this past 70-80%, but the battery has to be sized properly to be worth it.
• Buy-back rates across retailers: Currently range from around 7c per kWh on flat plans to 17c per kWh on the best time-of-use plans. Our Dynamic Tariff & Buy-Back Engine is the live source of truth here.
• Honest payback period: For most NZ homes with a well-sized system and a sensible tariff, payback lands between 7 and 12 years. Anyone quoting you 4 years is either lucky, lying, or in a very specific edge case.
• Standard warranties: 25 years on panels (product and performance), 10-12 years on inverters, 10 years on lithium iron phosphate (LiFePO4) batteries.

If any quote you receive contradicts these baseline figures by a lot, something is off. Either you're being told what you want to hear, or there's an assumption hidden in the maths.

What This Means for the Three Buyer Types

Solar isn't one decision. It's a different decision depending on who you are, what your house does during the day, and what you care about. We write for three Kiwi homeowner personas, and the advocacy looks slightly different for each.

If You're the ROI Pragmatist

You want a payback period, a clear cost, and a system that throws off honest returns for two decades. Your enemy is the inflated savings spreadsheet and the "deal" that loads margin into a finance product.

Our advocacy for you looks like: hard numbers, source citations, side-by-side retailer comparisons, and a calculator that doesn't flatter the result. Start with the ROI Calculator, then read the Scam Checklist so you can spot a dodgy quote at fifty paces.

If You're the Tech-Savvy Optimiser

You want to wring every last cent out of a time-of-use tariff, charge your EV from the sun, and run the household on smart logic. Your enemy is the installer who doesn't understand dynamic tariffs and sizes your battery like it's 2018.

Our advocacy for you looks like: detailed hardware comparisons, deep dives on Octopus NZ's plans and similar dynamic structures, and the Dynamic Tariff & Buy-Back Engine that ranks plans by your specific export and import pattern. Use that to argue back when a quote assumes a flat-rate tariff.

If You're the Eco-Conscious Family

You want to lock in the cost of living for your kids, reduce emissions, and not get sold something built on a lie. Your enemy is the greenwashed brochure and the unsafe lithium chemistry sitting in the garage.

Our advocacy for you looks like: honest talk about embodied carbon, safe battery chemistries (LiFePO4 is the residential standard for a reason), and finance options that don't punish you for doing the right thing. The Green Finance Qualifier is where to start.

The Common Traps NZ Homeowners Fall Into

This is the part where being a trust proxy means saying the uncomfortable things out loud. The following traps are the ones we see most often when homeowners write to us with quotes, contracts, or post-install regrets. None of them are illegal, mostly. They just aren't in your interest.

Trap 1: The "Today Only" Discount

If a sales rep tells you the price is only good if you sign tonight, the price was never honest in the first place. Reputable installers quote a price that's good for at least two to four weeks. The "today only" structure exists for one reason: to remove your ability to compare quotes. Walk them to the door.

Trap 2: The Inflated Savings Spreadsheet

A common tactic is to model your savings using the highest possible export rate, the lowest possible degradation, the highest possible electricity price inflation, and the most generous self-consumption assumption. Each one is just within plausibility. Stacked together, they paint a picture of a four-year payback that will never happen. Always ask: what export tariff is this using, and which retailer offers it?

Trap 3: The "No Upfront Cost" Pitch

"No upfront cost!" sometimes means the system has been rolled into a finance product whose total cost over the term is twenty or thirty percent higher than the cash price. The system isn't a gift. You just can't see the bill because it's spread across fifteen years of monthly payments. Always demand the cash equivalent price alongside the finance offer.

Trap 4: The Mystery Inverter

An undersized or no-name inverter will save the installer hundreds, and cost you thousands when it fails in year seven. Ask for the make, model, warranty length, and what happens if it dies after the manufacturer warranty expires. If the installer can't tell you in plain English, that's an answer.

Trap 5: The Oversized Battery

Selling a 13.5 kWh battery to a household that uses 9 kWh of evening load is great for margin, bad for payback. Battery sizing should follow your actual evening and overnight consumption, not the upper end of what's been imported into the country this quarter.

Trap 6: The Disappearing Installer

Some installers operate as labour-only contractors with no real after-sales presence. When the system trips out in year four, the phone number goes to a voicemail that's never returned. The 13-step vetting process exists specifically to weed these operators out before they get near you.

How to Use This Resource

You don't have to read every article on this site. Here's how we suggest you work through it depending on where you are in the journey.

If You're Just Curious

Start with the ROI Calculator to get a sense of whether solar makes financial sense for your roof. That alone will tell you if it's worth going further. If the numbers look honest and the payback fits your timeline, move on.

If You're Comparing Quotes

Read the Solar Scam Checklist first. Then run each quote through the 13-Step Vetting Process as a checklist. If a quote fails three or more steps, set it aside.

If You're Ready to Buy

Use our no-obligation quote service to get three quotes from vetted installers in your region. We've already done the vetting work, so the three quotes you receive will all clear the bar. Then it's about fit, communication, and timing.

If You're Worried About Finance

Run the numbers through the Green Finance Qualifier before you accept any in-house finance offer from an installer. The major banks' green loan products are usually more cost-effective than installer finance, sometimes by a wide margin.

Frequently Asked Questions

Why should I trust NZ Solar Centre over my local installer?

You don't have to choose. Use us to learn the landscape and check the maths. Use a local installer to actually do the work. We're not in competition with good installers; we're in competition with bad ones. A reputable local sparkie should be happy that you've done your homework before they arrive.

How do you make money if you don't sell solar?

Two ways. Advertising on the site, and a flat referral fee that vetted installers pay us when we send them a qualified enquiry. The fee is the same regardless of system size. We have no incentive to push you toward a bigger system than you need.

Are you affiliated with any panel or battery brand?

No. We have no exclusive deals with any panel, inverter, or battery manufacturer. We comment on brands based on their performance in NZ conditions, their warranty terms, and their service network here. If a brand starts performing poorly, we update the editorial accordingly.

What if the installer you matched me with does a bad job?

Every installer on our panel signs a service standard with us. If they fail it, they come off the panel. We've removed installers before and we'll do it again. If you've been matched through us and something goes wrong, write to us and we'll act. The Commerce Commission and Disputes Tribunal are also there for serious cases.

Why doesn't your calculator promise a 4-year payback?

Because that figure isn't honest for the vast majority of NZ homes. A 4-year payback would require an extremely low install price, a very high self-consumption rate, a generous export tariff, and a perfectly oriented roof in a high-irradiance region. That's a rare combination. Our calculator gives you the realistic figure, usually 7 to 12 years, so you can plan accordingly.

Do I need a battery?

Not necessarily. For many NZ households on a flat-rate retailer plan, a battery extends payback rather than improving it. For households on a strong time-of-use plan, or with high evening loads, a battery can pay off. The honest answer depends on your daily load profile and your retailer's tariff. We cover this in the cluster articles linked from our main solar hub.

Can I really trust online solar advice?

Some of it, yes. The test is whether the source publishes its assumptions, links to NZ-specific data, and discloses how it makes money. Apply that test to us, too. If we ever stop doing those things, you should stop trusting us.

What happens to my data if I use one of your tools?

It's used to give you the result on the page and, if you ask for quotes, to pass relevant details to the vetted installers in your region. It isn't sold, traded, or fed into a marketing database. The full detail is on our Privacy Act 2020 compliance page.

What if I already signed a contract I'm now worried about?

Most NZ residential solar contracts have a cooling-off period, typically 5 working days, under the Fair Trading Act. If you're within that window, you can usually cancel. If you're outside it, read the contract carefully, take photos of any in-home sales materials, and consider lodging with the Commerce Commission if the sales tactics were misleading. Consumer NZ has good guidance here.

Do you cover off-grid systems?

Lightly. Around 95% of NZ residential solar installs are grid-tied, so that's where most of our content sits. Off-grid is a specialist domain that often requires bespoke design, particularly for baches in remote areas, and we link out to specialists where appropriate.

What's the single biggest mistake you see homeowners make?

Signing on the first night, with the first rep, on a system designed by the seller. The fix is simple. Get three quotes. Sleep on it. Run the maths yourself or through our calculator. Almost every regret we've ever heard from a Kiwi solar buyer would have been avoided by that one habit.

Where to Go From Here

If you've made it this far, you already know more about residential solar than most people who sign a contract this week. Bookmark this page and the four resources below, and you'll have everything you need to make a confident decision.

For the maths on your specific roof, the Solar System Cost & ROI Calculator is the place to start. For checking any installer (ours or someone else's), use the 13-Step Vetting Process. For spotting dodgy sales tactics before they cost you, read the Solar Scam Checklist. For comparing finance options before you accept anything from an installer, run the numbers through the Green Finance Qualifier. And for the live picture on retailer buy-back rates, the Dynamic Tariff & Buy-Back Engine is updated as plans change.

That's the kit. The rest is just doing the work, one quote at a time, until the numbers and the installer both pass your own test. We'll be here when you need us.