SunPower Maxeon Solar Panels Review (2026): Maxeon 3, 6 & 7 Compared
SunPower Maxeon panels have been the premium choice in solar for twenty years: the highest efficiency, the slowest degradation and a 40-year warranty. In 2026 the panels are as good as ever, but the companies behind the name have changed a great deal. This guide compares the Maxeon 3, Maxeon 6 and Maxeon 7 side by side, with UK prices, the degradation rate, the warranty, where they’re made, who stands behind them now, and whether they’re still worth the premium.
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How this page fits with our SunPower review
This page compares the individual Maxeon models and their prices. For the brand as a whole, see our SunPower solar panels review. Company facts here were checked on 7 October 2026 and are changing quickly, so treat them as a snapshot.
Who makes SunPower Maxeon panels in 2026?
This used to be a simple question. It isn’t any more, and it matters, because a 40-year warranty is a promise from a company. Three different companies are involved.
| Company | What it is | Status in October 2026 |
|---|---|---|
| SunPower Corporation | The original American company that invented the technology | Filed for bankruptcy in the United States in August 2024. It has no role in UK sales |
| Maxeon Solar Technologies | The Singapore-based maker of the cells and panels, split off from SunPower in 2020. Its largest shareholder is the Chinese group TCL | Applied for judicial management, a court-supervised restructuring, in Singapore in April 2026 and was placed under interim judicial management. Its shares were suspended from the Nasdaq exchange in May 2026 |
| TCL SunPower Global | A TCL company that took over the SunPower business outside the United States in 2025, including Europe and the UK | Runs the SunPower UK website and sells through approved installers. It was reported that TCL would take on warranties outside the United States |
What that means for a UK buyer:
- You’re dealing with TCL SunPower Global. When the business changed hands, it was reported that TCL would take responsibility for warranties outside the United States. TCL is a very large electronics group, which is a stronger backer than Maxeon was on its own.
- The range is changing. When we checked, SunPower’s UK website showed two ranges for homeowners: the new M Class and the Performance panels. The Maxeon 3, 6 and 7 weren’t listed as current products, though some installers and wholesalers still supply them. The warranty page says the 40-year cover applies to its back-contact panels, which include both the M Class and Maxeon.
- Maxeon’s troubles are mainly American. Its court filing blames US customs holding its panels at the border since 2024, lawsuits and the loss of its biggest customer. None of that concerns panels on UK roofs. But it is the company whose name is on the older panels and datasheets.
None of this makes a Maxeon panel a bad panel. It does mean the paperwork matters more than it used to. We come back to that in the warranty section.
Maxeon 3 vs Maxeon 6 vs Maxeon 7
All Maxeon panels use the same idea. The electrical contacts are on the back of the cell, so nothing shades the front, and the cell sits on a solid copper base that resists cracking and corrosion. This is called back-contact, or IBC, technology. The numbers are generations.
| Panel | Power | Efficiency | Cells | Size and weight | Warranty | Status |
|---|---|---|---|---|---|---|
| Maxeon 3 | 415–430W | Up to 22.7% | 112 Maxeon Gen 3 | 1,812 × 1,046 × 40mm, 21.2kg | 40 years | The long-running classic. Now old stock |
| Maxeon 6 | 410–440W | Up to 22.8% | 66 larger Maxeon Gen 6 | 1,872 × 1,032 × 40mm, 21.8kg | 40 years | The volume model of recent years |
| Maxeon 6 AC | 410–425W | Up to 22.0% | 66 Maxeon Gen 6, with a built-in Enphase microinverter | 1,872 × 1,032 × 40mm, 21.8kg | 25 years on the datasheet we checked | For shaded or complex roofs |
| Maxeon 7 | 435–445W, or 465–475W in the longer version | Up to 24.1% | 112 or 120 Maxeon Gen 7 | 1,787 × 1,035 × 40mm, 20.7kg | 40 years | The most efficient. Stock expected to thin out |
| SunPower M Class | Up to 495W | Up to 24.5% | Back contact | 1,800 × 1,134mm | 40 years | The current flagship on SunPower’s UK site |
| SunPower Performance | Up to 515W | Up to 22.8% | Conventional cells, not back contact | Varies | 30 years | The lower-priced range. Not a Maxeon panel |
Three things to take from the table:
- Check which generation you’re being quoted. A “SunPower Maxeon” quote could be any of these. The price should reflect it.
- “SunPower” doesn’t always mean Maxeon. Performance panels carry the SunPower name but use ordinary cells and a shorter warranty.
- The SunPower Maxeon 5 was an earlier 66-cell generation, sold in the UK mainly as an AC panel with a built-in microinverter. It has been replaced by the Maxeon 6.
SunPower Maxeon 7 solar panels: specs
The Maxeon 7 is the most efficient of the three. These are the SunPower Maxeon 7 solar panel specs for the home-sized, 112-cell version:
| SunPower Maxeon 7 (SPR-MAX7-445-PT) | Figure |
|---|---|
| Power | 435, 440 or 445W |
| Efficiency | 23.5%, 23.8% or 24.1% |
| Cells | 112 Maxeon Gen 7, back contact |
| Size | 1,787 × 1,035 × 40mm |
| Weight | 20.7kg |
| Open-circuit voltage (Voc) | 83.0V |
| Operating voltage (Vmp) | 71.4V |
| Temperature coefficient | -0.27% per °C |
| Degradation | At least 98% in year one, then no more than 0.25% a year |
| Warranty | 40 years |
| Look | Black frame with a white backsheet on this version |
One figure needs explaining. A Maxeon 7 runs at about 83 volts, roughly double the voltage of an ordinary panel. That’s a feature of the design, not a fault. But it means the inverter and any optimisers have to be chosen to suit, and a Maxeon panel can’t simply be swapped for a standard one later. Use an installer who has fitted them before.
There’s also a longer 120-cell Maxeon 7 at 465–475W and 24.0% efficiency. It measures 1,913 × 1,035mm, so check it fits your roof (solar panel sizes).
SunPower Maxeon 6 solar panels, and the Maxeon 6 AC
The Maxeon 6 uses 66 larger cells to give 410–440W at up to 22.8% efficiency. It’s a little longer and heavier than the Maxeon 7, at 1,872 × 1,032mm and 21.8kg, with a temperature coefficient of -0.29% per °C. Most Maxeon panels fitted in the UK in the last few years are this model.
The SunPower Maxeon 6 AC is the same panel with an Enphase IQ 7A microinverter fixed to the back at the factory. Each panel turns its own power into mains electricity, so one shaded panel doesn’t hold back the rest. The full-black 425W version is the one most often sold.
| SunPower Maxeon 6 AC 425W full black | Figure |
|---|---|
| Model | SPR-MAX6-425-BLK-E3-AC |
| Panel power | 425W |
| Efficiency | 22.0% |
| Microinverter | Enphase IQ 7A, 349VA continuous output |
| Size and weight | 1,872 × 1,032 × 40mm, 21.8kg |
| Warranty on the datasheet we checked | 25 years on the panel and 25 years on the microinverter, through Enphase |
Two cautions on the AC version. The microinverter can deliver 349VA, which is less than the panel’s 425W peak, so a little output is clipped on the very brightest days. And the datasheet we checked gives 25 years, not 40, so ask which warranty applies before you pay a premium for it (microinverters vs string inverters, Enphase review).
SunPower Maxeon 3 solar panels
The Maxeon 3 is the panel that built the brand’s reputation. It uses 112 smaller cells to give 415–430W at up to 22.7% efficiency, measures 1,812 × 1,046 × 40mm and weighs 21.2kg. Its temperature coefficient is -0.27% per °C. The best-known version is the SunPower Maxeon 3 400W, which was one of the most efficient home panels you could buy when it launched.
In 2026 the Maxeon 3 is old stock. It still carries the 40-year warranty and it’s still a very good panel, but newer mainstream panels now match its efficiency for a fraction of the price. Only buy it at a clear discount to the Maxeon 7.
Our scores
Our rating
SunPower Maxeon range
★★★★☆ Superb panels and the longest warranty, at a high price and with a company in the middle of change
The bottom line: still the benchmark for quality. Buy it for the long warranty or a small roof, register the warranty, and know you’re paying a premium.
Get my Maxeon price →Efficiency and real-world UK output
For years Maxeon was the answer to “what are the highest efficiency residential solar panels?” The Maxeon 7 still reaches 24.1%, and the new M Class is listed at up to 24.5%. That’s at the very top of the market. The difference is that it’s no longer alone there. Back-contact panels from Aiko and LONGi now reach 24% or more, and mainstream panels are at 22–23% (most efficient solar panels).
What does that mean on a roof? One 445W Maxeon 7 on a south-facing UK roof generates roughly 410–460kWh a year, the same as any other 445W panel. Efficiency doesn’t make a panel produce more than its rated power. It makes the panel smaller. A Maxeon 7 gives 445W from 1.85 square metres, where a typical 445W mainstream panel needs about 1.95. On a large roof that’s irrelevant. On a small or awkward roof it can mean one extra panel fits.
Maxeon panels also do slightly better in heat and low light than older designs, with a temperature coefficient of -0.27% per °C. In the UK climate that’s worth a per cent or two a year, not more. See solar panel efficiency, solar panel output and how many panels fit your roof.
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Get My Maxeon Price →SunPower Maxeon solar panel degradation rate
Every solar panel loses a little output each year. The SunPower Maxeon solar panel degradation rate is the lowest any maker puts in writing: no more than 0.25% a year, after a first year in which the panel is guaranteed to deliver at least 98% of its rated power. Here’s what that looks like against a good mainstream N-type panel, which is typically guaranteed at 99% in year one and 0.4% a year after.
| Guaranteed output | Maxeon 3, 6 and 7 | Typical mainstream N-type panel |
|---|---|---|
| Year 1 | 98.0% | 99.0% |
| Year 10 | 95.8% | 95.4% |
| Year 25 | 92.0% | 89.4% |
| Year 30 | 90.8% | 87.4%, where the guarantee ends |
| Year 40 | 88.25% | No guarantee |
Two honest points about this table, which are our own sums from the published warranty terms:
- For the first ten years there’s almost nothing in it. The gap only opens up later.
- Over 25 years the difference in total energy is small. By our arithmetic a Maxeon panel delivers about 1% more electricity over 25 years than a mainstream panel of the same wattage. On a 4kW system that’s worth less than £10 a year.
So the low degradation rate is real, but it doesn’t pay for the price difference on its own. What you’re really buying is the guarantee that runs to year 40, long after other panels’ cover has ended. SunPower’s current UK warranty page quotes slightly different figures for its newest panels: 99% in year one and up to 89.3% in year 40.
The SunPower Maxeon solar panel warranty: 40 years
| Cover | SunPower Maxeon and M Class | Typical rival (Jinko, JA, Aiko) |
|---|---|---|
| Product warranty | 40 years | Usually 25 years |
| Power guarantee | 40 years, with at least 88.25% of rated output in year 40 | 30 years, to about 87–89% |
| Service | Repair, replacement or refund, with removal, shipping and refitting included “in applicable countries” | Usually the panel only. Labour is extra |
| Conditions | You must register the warranty. The service cover depends on your country and installer | Usually automatic |
| Other SunPower panels | Performance panels: 30 years. Maxeon 6 AC: 25 years on the datasheet we checked | — |
On paper this is the best panel warranty in the business. It’s longer than any rival’s, and it’s one of very few that includes the labour to swap a faulty panel. The SunPower Maxeon solar panel warranty used to be 25 years. It was later extended to 40 for panels registered through approved installers.
The question in 2026 is who stands behind it. For panels bought in the UK now, the business is run by TCL SunPower Global, and it was reported in November 2024 that TCL would take responsibility for warranties outside the United States. One German review site suggests that warranties on older installations may sit with Maxeon Solar Technologies, the company now in court-supervised restructuring. We couldn’t confirm the position for older UK installations.
Whichever applies to you, do these four things:
- Register the warranty. The 40-year cover has to be activated through SunPower’s warranty portal. Ask your installer for the certificate.
- Ask who the warrantor is. Get the name of the legal entity in writing on your quote or handover pack.
- Use an approved SunPower installer who is also MCS-certified, and make sure their workmanship guarantee is insurance-backed.
- If you already own Maxeon panels, find your registration and keep it safe with the serial numbers.
More in solar panel warranties explained.
SunPower Maxeon solar panels price in the UK
There’s no official SunPower Maxeon solar panels UK price list. The panels are sold through installers, not off the shelf. These are the figures published by UK review sites in 2026:
| SunPower Maxeon solar panels prices | UK figure in 2026 |
|---|---|
| SunPower Maxeon 7 solar panels price, per panel | About £280–£380 |
| Per watt | About 60p–88p |
| Ten Maxeon 7 panels fitted (about 4.4kW) | About £8,000–£10,500 |
| Twelve panels fitted (about 5kW) | About £8,500–£11,500 |
| Premium over a mainstream system of the same size | About £2,000–£3,000 |
| A good mainstream panel, for comparison | £70–£120 |
We couldn’t find a separate published UK price for the SunPower Maxeon 6 solar panels or the Maxeon 3. As older generations they should cost less than the Maxeon 7. If they’re quoted at the same price, ask why.
So a Maxeon panel costs three to four times a good mainstream panel, and a complete system costs £2,000–£3,000 more. For that you get the same electricity in year one, about 1% more over 25 years, a slightly smaller array and a much longer warranty. Whether that’s worth it depends on what you value:
- It can make sense if your roof is small and every panel counts, if you plan to stay in the house for decades, or if you simply want the longest cover available.
- It rarely makes sense on payback alone. A mainstream system at £5,500–£7,500 for 4kW pays for itself years sooner (solar panel payback).
Fitted prices include scaffolding, the inverter and 0% VAT, which applies until 31 March 2027 (VAT on solar panels). For the wider picture, see solar panel cost and the 4kW solar system guide.
SunPower Maxeon solar panels UK stockists: where to buy
You won’t usually find SunPower Maxeon solar panels for sale in an online shop. In the UK they’re supplied through a network of approved installers, and the 40-year warranty depends on registration through one of them.
- Start with SunPower’s UK website, run by TCL SunPower Global, which can put you in touch with approved installers.
- Ask any installer who quotes Maxeon whether they’re an approved SunPower partner, and which generation of panel they’re supplying.
- Be careful with panels sold loose online, including imports from Europe or Australia. The warranty may not transfer, and the panel’s high voltage needs a matching design.
Expect the Maxeon 3, 6 and 7 to become harder to find as the M Class takes over. That’s another reason to get the exact model in writing.
Where are SunPower Maxeon panels made?
Not in the United States, despite the American name. The datasheet for the Maxeon 7 we checked says the cells are made in the Philippines and the panel is assembled in Mexico. Maxeon has also made cells and panels in Malaysia. The Philippines factory was part of the business TCL agreed to buy.
We couldn’t find the manufacturing location for the new M Class on SunPower’s UK website. If the country of origin matters to you, ask for it on the datasheet (best solar panels UK).
In Australia, where the brand is also popular, SunPower Maxeon solar panels are sold by SunPower Corporation Australia, which now operates as part of TCL’s solar business.
Maxeon vs the alternatives
| SunPower Maxeon 7 | Aiko Neostar | REC Alpha | Typical mainstream (Jinko, JA, Trina) | |
|---|---|---|---|---|
| Cell type | Back contact | Back contact | Heterojunction | N-type TOPCon |
| Efficiency | Up to 24.1% | About 24% or more | About 22–23% | About 22–23% |
| Yearly degradation | 0.25% | About 0.35% | About 0.25% | About 0.4% |
| Product warranty | 40 years | Usually 25 years | 20–25 years | Usually 25 years |
| Labour included in warranty | Yes, where applicable | Usually not | Through certified installers | Usually not |
| Company position in 2026 | Brand run by TCL. Maxeon in restructuring | Large and growing | Stable | The world’s largest makers |
| Typical panel price | £280–£380 | Much lower | Mid to high | £70–£120 |
Five years ago nothing came close to Maxeon. Today a back-contact panel from Aiko gives you similar efficiency for far less money, and a mainstream panel gets you most of the way for a quarter of the price. What Maxeon still has to itself is the 40-year warranty with labour included. If that’s what you want, nothing else matches it. If you want the most electricity for your money, look elsewhere.
Read our reviews of Aiko Neostar, Aiko, REC, LONGi, Jinko, JA Solar and Trina, and of two other premium names that have had a hard few years, Meyer Burger and Panasonic.
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Get My Fixed Price →Pros & cons
Pros
- 40-year warranty on product, power and service
- Lowest warranted degradation rate, at 0.25% a year
- Up to 24.1% efficiency on the Maxeon 7
- Labour to replace a faulty panel is included, where applicable
- Solid copper-backed cells with a long track record
- Now backed in the UK by the TCL group
Cons
- Three to four times the price of a mainstream panel
- Maxeon Solar Technologies is in court-supervised restructuring
- The Maxeon 3, 6 and 7 are being replaced by the M Class
- Rivals now match its efficiency for less
- High-voltage design needs a matching inverter and an experienced installer
- Warranty must be registered, and it isn’t always clear who the warrantor is
Verdict: are SunPower Maxeon solar panels any good?
4.0 / 5. As panels, the Maxeon range is still as good as solar gets: very efficient, very slow to degrade and guaranteed for 40 years. If we were scoring the product alone it would be close to five. It loses a point for two things that have nothing to do with the engineering. The price is three to four times a mainstream panel for much the same electricity, and the company that makes the cells is in court-supervised restructuring while the brand moves to a new owner and a new flagship.
Our advice: buy Maxeon if you have a small roof, plan to stay for decades and value the longest warranty in the business. Use an approved installer, register the warranty, and get the warrantor’s name and the exact panel model in writing. If you want the best return on your money, a good mainstream panel or an Aiko will get you there for far less (SunPower review, how to choose a solar installer, are solar panels worth it?).
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SunPower Maxeon solar panels: frequently asked questions
Are SunPower Maxeon solar panels any good?
Yes. They’re among the most efficient panels made, at up to 24.1% for the Maxeon 7, with the lowest warranted degradation rate at 0.25% a year and a 40-year warranty. The drawbacks are the price, about £280–£380 a panel in the UK, and the fact that Maxeon Solar Technologies entered court-supervised restructuring in 2026 while the brand passed to TCL SunPower Global. We rate the range 4.0 out of 5.
What is the difference between the Maxeon 3, Maxeon 6 and Maxeon 7?
They’re successive generations of the same back-contact technology. The Maxeon 3 gives 415–430W at up to 22.7% efficiency. The Maxeon 6 gives 410–440W at up to 22.8% from fewer, larger cells, and also comes as an AC panel with a built-in microinverter. The Maxeon 7 is the most efficient, at 435–445W and up to 24.1%. All three have the same 0.25% yearly degradation.
How much do SunPower Maxeon solar panels cost in the UK?
UK review sites in 2026 put a Maxeon 7 at about £280–£380 per panel, or 60p–88p per watt. A fitted system of ten panels costs about £8,000–£10,500, which is around £2,000–£3,000 more than a mainstream system of the same size. There’s no official UK price list, because the panels are sold through approved installers.
What is the SunPower Maxeon degradation rate?
No more than 0.25% a year, after a first year at 98% or better. That leaves a guaranteed 92% of rated output at year 25 and 88.25% at year 40. A typical mainstream N-type panel is guaranteed at 0.4% a year, leaving 89.4% at year 25. By our sums the difference is worth about 1% more electricity over 25 years.
How long is the SunPower Maxeon warranty?
Forty years, covering the product, the power output and service, which includes removal, shipping and refitting of a faulty panel in applicable countries. You must register the warranty. SunPower’s Performance panels have 30 years, and the Maxeon 6 AC datasheet we checked gives 25 years, so check which applies to your panel.
Is SunPower still in business?
It depends which company you mean. SunPower Corporation in the United States filed for bankruptcy in August 2024. Maxeon Solar Technologies, the Singapore-based maker, applied for judicial management in April 2026. In the UK and Europe the SunPower brand is run by TCL SunPower Global, a separate TCL company that took over the business in 2025 and continues to sell panels.
Where can I buy SunPower Maxeon solar panels in the UK?
Through approved SunPower installers, which you can find through the SunPower UK website. The panels aren’t generally sold loose online, and the 40-year warranty depends on registration. SunPower’s UK site now leads with the newer M Class panel, so the Maxeon 3, 6 and 7 are likely to become harder to find. Get the exact model named on your quote.
Where are SunPower Maxeon panels made?
Mainly in Asia and Mexico. The Maxeon 7 datasheet we checked says the cells are made in the Philippines and the panel is assembled in Mexico. Maxeon has also manufactured in Malaysia. They are not made in the United States, despite the American brand name.
Going Solar UK is an introduction service, not an installer, and has no connection with SunPower, Maxeon Solar Technologies, TCL or TCL SunPower Global. Product ranges and warranty terms are from SunPower’s UK website, checked on 7 October 2026. Specifications are from Maxeon datasheets as published by distributors. Company events are as reported by pv magazine, SolarQuotes and One Step Off The Grid and in Maxeon’s filings with the US Securities and Exchange Commission, and the situation may have changed since this page was written. The note on older warranties is from one German review site and has not been verified by us. UK prices are from third-party UK review sites in 2026 and are not SunPower’s own figures. Degradation comparisons and energy differences are our own arithmetic from published warranty terms. Competitor figures are typical for current ranges. Installed prices are typical 2026 UK estimates. The rating is our opinion. If anything here is inaccurate or out of date, contact us and we will correct it. This is not financial or legal advice. Always confirm the exact model, datasheet, warrantor and warranty registration with an MCS-certified installer.