Tier-1 Solar Panels: What Does It Mean for Your Warranty?

Here is the thing almost no installer will tell you straight: "Tier 1" is a financial ranking, not a quality rating, and it has nothing whatsoever to do with your warranty. It comes from BloombergNEF, and all it really measures is whether a panel manufacturer is considered "bankable", meaning big banks have been willing to lend against their products on large projects. It says nothing about how good the panels are, how long they will last on your Tauranga roof, or whether the company will honour a claim in 2038. When you are spending $9,000 to $14,000 on a typical 5kW to 6.6kW system (in line with current MBIE and installer pricing), what actually protects you is the wording of two separate warranties, not a marketing badge.

So if a salesperson leans on "these are Tier 1 panels" as the reason you should sign, that is your cue to ask harder questions, not fewer. Let's pull this apart properly, because the gap between what "Tier 1" implies and what it actually delivers is where a lot of New Zealand homeowners get caught.

What "Tier 1" actually means (and what it doesn't)

The Tier 1 list is published quarterly by BloombergNEF, a research arm of Bloomberg. To make the list, a manufacturer's panels need to have been used, unsupported by the manufacturer's own finance or the supplier's finance, in a number of large, separately financed solar projects over the previous two years.

Read that again. The test is whether lenders will put money behind the panels at utility scale. That is a measure of commercial bankability, not durability, not efficiency, not how the cells cope with a Northland summer or a Central Otago frost.

BloombergNEF says this themselves, plainly, in their own documentation: the list is not a guarantee of quality and should not be used as the sole basis for a purchasing decision. The badge has simply been borrowed by the sales side of the industry because it sounds reassuring.

Why the badge still has some value

It is not worthless. A manufacturer that has shipped enough volume into bank-financed projects to make the list is, by definition, a sizeable operation that has been around a while. That matters, because a warranty is only ever as good as the company standing behind it. We will come back to that, because it is the single most important point on the page.

But "large and bankable" and "best panel for your specific roof" are two different things. A small premium manufacturer can make a genuinely better panel and never appear on the list because they do not sell into the giant financed solar farms the ranking is built around.

The two warranties that actually matter

Every quality solar panel comes with two completely separate warranties, and conflating them is the most common way Kiwi homeowners get misled. When someone says "these panels have a 25-year warranty", your first question should be: which one?

1. The product (or workmanship) warranty

This covers physical defects in the panel itself: the materials, the manufacturing, the junction box, the frame, delamination, that sort of thing. If the panel fails because it was built badly, this is the warranty that pays.

• Older or budget panels: often 10 to 12 years product warranty.
• Current mainstream panels: typically 12 to 15 years.
• Premium N-type panels: increasingly 25, 30, even 40 years product warranty.

This is the number that genuinely tells you something. A manufacturer offering a 25-year product warranty is staking real money on the panel not falling apart. A 12-year product warranty on a panel sold as "premium" is a quiet red flag.

2. The performance (or output) warranty

This is the "25-year" or "30-year" figure plastered across most marketing, and it is the weaker promise of the two. It only guarantees that the panel will still produce a certain percentage of its rated output after a given number of years. It does not mean the panel is replaced if it underperforms in any practical sense; the bar for a successful claim is high and the degradation is gradual.

A typical performance warranty guarantees something like 90% of rated output at year 10 and around 80 to 88% at year 25, depending on the panel. Better panels (especially modern N-type) degrade more slowly and warrant a higher floor, often 87% or more at 30 years.

Here is the part installers rarely volunteer: a performance warranty claim requires you to prove the panel has dropped below the guaranteed curve, which in practice means paying for testing, often removing the panel, and arguing with an offshore manufacturer. For a single residential panel, the cost of proving the claim can exceed the value of the panel. Performance warranties are real, but they are far harder to actually use than the headline number suggests.

The insight nobody puts on their website: a warranty is only worth the company behind it

This is the bit that matters more than Tier 1, more than the warranty length, more than almost anything else on the quote.

A 30-year warranty is a 30-year promise from a company you are betting will still exist in 30 years and will still honour claims from a small house in, say, Levin. The solar manufacturing world is brutal. Plenty of brands that were "Tier 1" a decade ago no longer exist, have been absorbed, or have quietly wound down their warranty support. When the manufacturer is gone, the paper is worthless.

So the real protection has three layers, and you want all three:

• A manufacturer big and stable enough to still be here. This is the one genuine thing Tier 1 status hints at.
• A New Zealand distributor or agent who holds local stock and handles claims here. A warranty you can action through a Kiwi importer, without shipping panels to China, is worth vastly more than one you cannot.
• An installer who will still be trading. Because the labour to remove and refit a panel is usually not covered by the manufacturer, and that labour can run to several hundred dollars per call-out.

The labour gap that catches people out

Say a panel fails in year 14. The manufacturer ships a free replacement, honouring the product warranty. Lovely. But who pays the electrician to get on your roof, isolate the array, swap the panel, and recommission the system? In almost every case, that is on you unless your installer offered a separate workmanship warranty covering labour.

This is why we always say the installer's own workmanship warranty (commonly 5 to 10 years on the installation itself) and their likely longevity matter as much as the brand on the panel. A bargain-basement install from an operator who vanishes in three years leaves you holding every future labour cost yourself.

A worked example: two "Tier 1" quotes that are not equal

Imagine two quotes land in your inbox for a 6.6kW system on a 1990s brick-and-tile place in Rolleston, both around $11,500 installed, both proudly stamped "Tier 1 panels".

Quote A: A well-known Tier 1 brand, but the budget P-type line. Product warranty 12 years, performance warranty 25 years to 84.8%. No mention of who holds NZ stock. Installer workmanship warranty: 5 years.

Quote B: A current N-type panel from a manufacturer with an established New Zealand distributor holding local stock. Product warranty 25 years, performance warranty 30 years to 87.4%. Installer workmanship warranty: 10 years, and they have been trading locally since 2014.

Same price. Same magic words. But Quote B gives you double the product cover, slower degradation, a local claims path, and an installer twice as likely to still be around when something goes wrong. The Tier 1 label told you nothing useful. The warranty wording and the local support told you everything.

If you want to see how those numbers feed into the payback over 20 or 25 years, our solar cost and ROI calculator lets you plug in real figures and see what longer panel life actually does to the return.

P-type, N-type, and why the panel chemistry changes the warranty

The reason premium product warranties have stretched out to 25 and 30 years lately is largely down to a shift in cell technology. The newer N-type cells degrade more slowly and tolerate heat better than the older P-type cells, which is exactly why manufacturers are confident enough to warrant them for longer.

That matters in our climate. A panel's output drops as it gets hot, and a north-facing roof in Kerikeri or Gisborne in February gets seriously hot. A cell type that holds up better in heat is not a marketing nicety here; it is genuine extra yield over the life of the system. We dig into the practical difference for our conditions in our breakdown of N-type vs P-type cells for the New Zealand climate.

If you are weighing up specific brands, we have hands-on looks at a few of the panels New Zealanders are actually being quoted, including our review of DAS Solar and Tongwei N-type panels and a head-to-head on Jinko vs Trina. The warranty terms in those write-ups tell you far more than any tier ranking.

How to read the warranty section of a solar quote

Most quotes bury the warranty detail or reduce it to a single reassuring number. Here is exactly what to extract before you sign anything.

• Ask for the product warranty in years, separately from the performance warranty. If they only give you one number, they are hiding the weaker one.
• Ask who holds New Zealand stock of these exact panels. A named local distributor is a green light. "We import direct" with no local agent is a yellow one.
• Ask whether the warranty claim is handled in New Zealand or whether you deal with the overseas factory. This is the single biggest practical difference in whether you ever get a claim honoured.
• Ask whether labour and removal are covered, and by whom. Get it in writing. The manufacturer almost never covers labour.
• Ask how long the installer has been trading under that company name. Polite, fair, and revealing.
• Ask for the panel's degradation curve. First-year degradation and the annual rate after that tell you more than the headline year-25 figure.

None of these questions are rude. A good installer will answer every one without flinching, because they have nothing to hide. The ones who get cagey are telling you something. For the wider picture on what makes good kit, our main guide to solar hardware and tech walks through panels, inverters, and the rest of the system.

Where the Tier 1 badge genuinely doesn't help you

Being honest about the limits: Tier 1 status will not tell you any of the following, all of which matter far more for a home in Aotearoa.

• It will not tell you how the panel performs in low light, which matters through a Wellington or West Coast winter.
• It will not tell you the temperature coefficient, which matters in the upper North Island heat.
• It will not tell you whether the specific model you are being quoted is current or last year's clearance stock; manufacturers appear on the list, individual panel models do not.
• It will not tell you whether the warranty is supported in New Zealand.
• It will not protect you from a poor installation, which is the most common cause of solar problems we see regardless of panel brand.

That last point is worth sitting with. A top-shelf panel fitted badly will give you grief; a mid-range panel fitted properly by a competent, lasting installer will quietly perform for decades. The hands on the roof matter more than the badge on the box.

Frequently Asked Questions

Is a Tier 1 solar panel better quality than a non-Tier 1 panel?

Not necessarily. Tier 1 is a BloombergNEF financial bankability ranking, not a quality grade. It indicates the manufacturer is large and has supplied bank-financed projects, which suggests stability, but it says nothing about how a specific panel performs or lasts. Some excellent panels never appear on the list because the maker does not sell into utility-scale financed projects.

What is the difference between a product warranty and a performance warranty?

The product warranty covers physical defects in the panel itself, such as faulty materials or manufacturing, and is the stronger of the two. The performance warranty only guarantees the panel will still produce a set percentage of its rated output after a given number of years, and it is much harder to claim against in practice. Always ask for both numbers separately.

How long should a solar panel product warranty be in New Zealand?

Current mainstream panels typically carry 12 to 15 years of product warranty, while premium N-type panels increasingly offer 25, 30, or even 40 years. A panel sold as premium but carrying only a 12-year product warranty deserves a closer look. The product warranty length is one of the most honest signals of how confident the maker is in the panel.

Does the manufacturer's warranty cover the cost of replacing a faulty panel?

Usually only the panel itself, not the labour. If a panel fails years down the track, the manufacturer may ship a free replacement, but the cost of an electrician removing and refitting it is generally yours unless your installer provided a separate workmanship warranty covering labour. This is why the installer's own warranty and longevity matter as much as the brand.

Why does it matter whether the warranty is supported in New Zealand?

A warranty is only useful if you can action it. If there is a named New Zealand distributor holding local stock, a claim is straightforward. If you have to deal directly with an overseas factory, shipping panels and arguing across time zones, a successful claim becomes far less likely. Always ask who handles warranty claims locally.

What happens to my warranty if the panel manufacturer goes out of business?

In most cases the warranty becomes effectively worthless, because there is no company left to honour it. This is the real reason manufacturer stability matters, and the one genuine thing the Tier 1 badge hints at. Choosing an established maker with a solid New Zealand presence reduces this risk considerably.

Are N-type panels worth the extra warranty length?

Often yes, because the longer warranties reflect genuinely slower degradation and better heat tolerance, both of which add up to more energy over the life of the system in New Zealand conditions. The longer product warranty also gives you more years of defect cover. Whether the price premium pencils out depends on your roof and usage, which is worth modelling before you commit.

If two quotes both say "Tier 1", how do I choose between them?

Ignore the badge and compare the detail: product warranty length, performance degradation curve, whether claims are supported in New Zealand, whether the installer covers labour, and how long that installer has been trading. Two Tier 1 quotes at the same price can offer wildly different real protection, and these factors are what separate them.

The Bottom Line

"Tier 1" is a useful clue and a useless guarantee. It hints that a manufacturer is big enough to still be around, which genuinely matters for a 25-year promise, but it tells you nothing about whether the panel suits your roof or whether you will ever get a claim honoured. The real protection sits in the wording: a long product warranty, a realistic performance curve, a New Zealand claims path, and an installer who covers labour and will still be trading when you need them.

Ask the questions above, get the answers in writing, and the badge becomes a footnote rather than a deciding factor. If you want to go deeper on what separates a genuinely good panel from a merely well-marketed one, have a read of how N-type and P-type cells stack up in our climate, then run your real numbers through the ROI calculator to see what a longer-lasting panel is actually worth to you over time.