If you've been quoted Trina Vertex S+ panels for your home, you're looking at one of the most sensible choices on the UK market right now. It's the panel most installers reach for by default in 2026, and for good reason. On the balance of efficiency, warranty and price, the Vertex S+ is the panel we'd recommend for the vast majority of normal UK homes.
This review gives you the honest version: what the Vertex S+ actually is, who it suits, what it costs, and how it stacks up against the older Vertex S and the newer S+ G3. We haven't lab-tested these ourselves – what you're getting is our read on the datasheet, the warranty, and what the panel actually does for you on a real roof.
Here's what's inside: quick answers, a full specs table, UK pricing, the S versus S+ versus G3 comparison, pros and cons, and a clear steer on whether it's the right panel for your project.
- It's the 2026 default for most UK homes. On the balance of efficiency, warranty and price, this is the panel we'd point most homeowners toward for a new installation.
- It uses newer N-type technology. That means higher efficiency (up to 23.0%), slower ageing, and better performance in heat and low light than the older Vertex S.
- The warranty is genuinely strong. You get 25 years on the product and 30 years on power, with the panel guaranteed to still produce 87.4% of its output at year 30.
- It's excellent value. UK retail sits at around £58.95 to £61.45 ex VAT per panel, with a fully installed 4kW system typically costing £6,500 to £9,500 at 0% VAT.
- The maker is rock-solid. Trina is a Tier 1 manufacturer with a 100% BNEF bankability rating – so the company behind your 30-year warranty is very much here for the long haul.
Our Verdict & Rating
- Excellent all-round value – keen pricing on newer N-type, dual-glass technology from a Tier 1 maker
- Strong warranty – 25 years product, 30 years power, and 87.4% output guaranteed at year 30
- Good efficiency at up to 23.0%, so you need fewer panels for the same system size
- Tougher dual-glass build that resists micro-cracks and scratches better than the older backsheet panel
- Well suited to harsh environments – certified against salt spray, sand, dust and ammonia, ideal for coastal homes
- Light for its type at 21kg, so it works on lower load-capacity roofs
- Backed by a very bankable maker – Trina holds a 100% BNEF bankability rating
- Not the cheapest option – budget PERC panels and the older Vertex S undercut it slightly on upfront cost
- Not the highest efficiency available – the newer G3 and some rival back-contact panels edge it out
- Warranty varies by variant and region – you must confirm the exact terms for your panel
- Naming confusion in the market makes it easy to buy the wrong thing
- Some older power bins discontinued – stock and exact wattages vary
The Vertex S+ is the panel we'd recommend for most UK homes in 2026, and it earns that spot honestly. Newer N-type i-TOPCon cells, a tougher dual-glass build, up to 23.0% efficiency and a 30-year power warranty – all at a keen price of around £59–62 ex VAT per panel from a manufacturer you can genuinely trust. Budget panels undercut it slightly and the newer G3 edges it on efficiency, but for the vast majority of homeowners the S+ hits the sweet spot between cost, performance and peace of mind. It's the sensible, safe, good-value default.
Quick Answers
- What is the Trina Vertex S+?
- A monocrystalline solar panel using newer N-type i-TOPCon cells and a tougher dual-glass build. It's Trina's current mainstream residential panel, launched in 2022, delivering up to 460W depending on the exact model.
- Who is the Vertex S+ for?
- Most normal UK homes. It's also a strong pick for coastal or harsh environments, and for roofs where space is tight and you need to squeeze more power from fewer panels.
- Is the Trina Vertex S+ worth buying in 2026?
- Yes. For the vast majority of homeowners planning a new system, this is the panel to buy. It hits the sweet spot of good efficiency, a long warranty, and keen pricing, all from a maker you can trust.
- How does it compare to the older Vertex S?
- It wins on almost everything – newer N-type cells (versus older PERC), tougher dual-glass construction, higher efficiency, slower degradation, and a longer warranty. The only thing the older Vertex S beats it on is upfront price, and even then only slightly.
What Is the Trina Vertex S+?
The Vertex S+ is a residential solar panel made by Trina Solar, one of the world's largest manufacturers. It's the panel that replaced the older Vertex S, and the upgrade is genuine rather than cosmetic. Two things changed, and both matter to you.
First, the cell technology. The Vertex S+ uses N-type i-TOPCon cells, while the older Vertex S used P-type PERC. That jargon translates into something simple: N-type cells are more efficient, they fade more slowly over the years, and they hold up better in heat and low light. For a UK roof – where you're rarely blasted with bright sunshine and often working in cloud – that low-light and heat behaviour genuinely helps your yearly output.
Second, the construction. The Vertex S+ swaps the older single-glass-and-backsheet build for a dual-glass sandwich – a 1.6mm sheet of glass on both the front and back. Think of it like laminated safety glass rather than a single pane. It's less prone to the tiny micro-cracks and back-scratches that can creep in during installation, so the panel is more durable over its decades on your roof. The clever part is that despite the extra glass, it weighs about the same as the older backsheet version at just 21kg, so it still works on lighter or lower-capacity roofs.
Here's where it sits in the range. The Vertex S+ is the current mainstream residential flagship – the panel most UK homeowners are offered on a 2026 quote. It sits above the legacy Vertex S and just below the newer Vertex S+ G3, which arrived in March 2026 (more on that below).
Who the Vertex S+ Is For
The beauty of the Vertex S+ is that it suits almost everyone. It's a genuine all-rounder rather than a specialist panel. It's a strong fit if you are:
- A normal home wanting a reliable, well-priced panel. This is the core audience, and the Vertex S+ delivers on efficiency, warranty and value without any fuss.
- On a space-limited roof. Higher efficiency means each panel produces more, so you need fewer of them to hit your target system size. If your usable roof area is small, that matters.
- In a coastal, humid or otherwise harsh spot. The Vertex S+ is certified against salt spray, sand, dust and ammonia corrosion, so it's genuinely well suited to seaside homes and tougher environments.
- Working with a lower load-capacity roof. Because the dual-glass panel weighs about the same as the older backsheet version, you get the durability upgrade without piling extra weight onto your roof structure.
The honest summary: if you're planning a new home solar system in 2026 and you don't have a specific reason to go premium or budget, the Vertex S+ is the sensible default. It's the panel we'd expect to see on most quotes, and it earns that spot.
Trina Vertex S+ Full Specifications
These figures are for the TSM-NEG9R.28 (the 2024_C datasheet), the current top monofacial variant. One thing to keep in mind: the power range shifts depending on which datasheet revision you're looking at. The 2024_C revision goes up to 460W, while earlier 2023 and 2024 revisions topped out at 450W or 455W. So if a seller quotes "up to 450W," they're not wrong – they're just quoting an older revision.
| Specification | Detail |
|---|---|
| Power range | Up to 460W (2024_C revision); varies by datasheet |
| Max module efficiency | 23.0% |
| Cell type | N-type i-TOPCon, 144 cells, multi-busbar |
| Construction | Dual glass, 1.6mm front + 1.6mm back |
| Temperature coefficient (Pmax) | -0.29%/°C |
| Dimensions | 1,762 × 1,134 × 30mm |
| Weight | 21.0kg |
| Frame | 30mm anodised aluminium, black |
| Junction box | IP68 rated |
| Max system voltage | 1,500V DC |
| Operating temperature | -40°C to +85°C |
A couple of these matter more than the rest for your home. The temperature coefficient of -0.29%/°C tells you how much output the panel loses as it heats up – and this is better than the older Vertex S at -0.34%, meaning the S+ copes better on warm days. At 21kg and just under 1.8m long, it's a compact, manageable panel that suits fiddly or broken-up roofs, which is a quiet strength on older UK housing.
Warranty: What You're Actually Covered For
Here's where the Vertex S+ genuinely shines, and it's worth understanding what you're getting. You get a 25-year product warranty (covering faults and defects in the panel itself) and a 30-year power warranty (guaranteeing the panel keeps producing a set amount of electricity).
The degradation figures back this up:
- First-year drop: 1.0% maximum
- Annual drop after that: 0.4% maximum
- Guaranteed output at year 1: 99%
- Guaranteed output at year 30: 87.4%
In plain terms, after 30 years your Vertex S+ is warranted to still produce nearly 88% of the electricity it made on day one. That's a genuinely strong figure, and it's a big part of why this panel is such a safe long-term bet. Compare it to the older Vertex S, which retains 84.8% but only over 25 years, and you can see the newer panel gives you both a longer term and a better end point.
The product warranty isn't uniformly 25 years across every variant and region. Some older and regional datasheets state 15 years, or "15/25 years," and certain markets have a separate warranty supplement. So before you sign, confirm the warranty terms on the specific regional document for the exact panel you're buying – don't rely on the marketing page.
Trina Vertex S+ Price UK 2026
Working out what you'll actually pay is more straightforward for the S+ than for many panels, because it's widely stocked and sold openly at retail. Here's the realistic picture for 2026, and remember panel pricing moves month to month, so treat these as a starting point.
- Retail, 450W full black: around £61.45 ex VAT (£73.74 inc VAT) from UK sellers like Plug In Solar; trade listings run lower still, from about £51 ex VAT.
- Retail, 455W black framed: around £58.95 ex VAT (£70.74 inc VAT).
- Per panel, installed: roughly £150 to £300, depending on system size, access and your installer.
- Fully installed 4kW system: £6,500 to £9,500 at 0% VAT, with most quotes landing at £7,000 to £8,500.
That per-panel retail price is genuinely keen for an N-type, dual-glass panel from a Tier 1 maker – it's a big part of why the S+ is such good value. Through trade channels it sits at a modest premium over the older Vertex S, which is exactly the point: for a few pounds more per panel, you get the newer technology, higher efficiency and a longer warranty. That's an easy call for most people. Worth noting: residential solar currently benefits from 0% VAT in the UK, though it's always wise to confirm the relief is still in place before you commit.
Vertex S vs Vertex S+ vs Vertex S+ G3
This is the comparison that helps you place the S+ correctly. The headline: the S+ is a big step up from the old Vertex S, and the newer S+ G3 is a smaller, more refined step up again.
| Feature | Vertex S | Vertex S+ | Vertex S+ G3 |
|---|---|---|---|
| Cell type | P-type PERC | N-type i-TOPCon | i-TOPCon Ultra |
| Construction | Single glass + backsheet | Dual glass | Dual glass |
| Launched | 2021 | 2022 | March 2026 |
| Availability | Legacy stock | Now | H2 2026 |
| Power range | 390–435W | 425–460W | 465–495W |
| Max efficiency | 21.8% | 23.0% | 24.3% |
| First-year degradation | 2.0% | 1.0% | Under 1.0% |
| Annual degradation | 0.55% | 0.4% | 0.35% |
| Power warranty | 25 years | 30 years | 30 years |
| Output at end of term | 84.8% at yr 25 | 87.4% at yr 30 | 88.5% at yr 30 |
| Temp coefficient | -0.34%/°C | -0.29%/°C | -0.26%/°C |
Two things stand out. The jump from the S to the S+ is significant – you're moving from older PERC cells to newer N-type, single glass to dual glass, and gaining a longer, better warranty; if you're choosing between these two, the S+ is almost always the better buy. The jump from the S+ to the G3 is much smaller – the G3 pushes efficiency higher (up to 24.3%) and trims degradation a touch, but these are architectural refinements rather than a wholesale change. The G3 is worth considering for a premium build or where roof space is genuinely tight, but for most homes it's only worth the premium if the price gap is small – otherwise the S+ remains the value pick.
Buying Considerations
If you've decided the Vertex S+ fits your plans, a few checks will save you grief.
- Watch the naming – this is the big one. The Vertex S and S+ get muddled constantly, and several UK listings sell S+ products under the older "Vertex S" name. Two quick ways to tell them apart: check the cell type (N-type means S+, PERC means the older S) and the glass (dual glass means S+, single glass means the older S). If you're paying for the newer panel, make sure that's what you're actually getting.
- Confirm the exact variant and datasheet revision. The power range differs across revisions – "up to 450W" and "up to 460W" are both correct for different versions of the same NEG9R.28 panel. There's also a full-black variant (NEG9R.25) and a bifacial version (NEG9RC.27) with different specs, so pin down exactly which one you're being quoted.
- Confirm the warranty terms. As covered above, the product warranty isn't uniformly 25 years everywhere. Check the regional warranty document for your specific panel rather than trusting the headline figure on a marketing page.
- Confirm MCS certification. This is what makes your system eligible for the Smart Export Guarantee – the scheme that pays you for the electricity you send back to the grid. Verify the specific panel and your installer are MCS-registered before ordering, or you'll miss out on that income.
- Check the stock is real. Some older power bins have been discontinued, even though plenty of current stock circulates. Confirm availability with your supplier before planning a system around a specific wattage.
Trina Vertex S+ FAQs
Is the Trina Vertex S+ a good panel?
Yes – it's one of the best mainstream choices on the UK market in 2026. It combines good efficiency, a long 30-year power warranty, and keen pricing from a top-tier maker. For most homes, we'd rate it the sensible default.
What's the difference between the Vertex S and Vertex S+?
The S+ uses newer N-type cells (versus older PERC), dual-glass construction (versus single glass), hits higher efficiency (23.0% versus 21.8%), degrades more slowly, and carries a longer warranty. The S is the older, slightly cheaper panel.
How long do Trina Vertex S+ panels last?
The power warranty runs 30 years, and the panel is guaranteed to retain 87.4% of its output at year 30. In practice, a well-installed system will keep generating well beyond that.
How much does a Trina Vertex S+ cost in the UK?
Around £58.95 to £61.45 ex VAT per panel at retail, roughly £150 to £300 per panel installed, and £6,500 to £9,500 for a fully installed 4kW system at 0% VAT.
Should I wait for the Vertex S+ G3 instead?
Only if you want the highest efficiency or have a very tight roof, and only if the price gap is small. The G3 arrives in the second half of 2026 and edges the S+ on efficiency, but the improvements are modest. For most homes, the S+ remains the better value.
Is the Vertex S+ good for a coastal home?
Yes, genuinely. It's certified against salt spray, sand, dust and ammonia corrosion, which makes it well suited to seaside and other harsh environments where lesser panels can degrade faster.
Is Trina a reliable manufacturer?
Very. Trina is a Tier 1 maker founded in 1997, with a 100% BNEF bankability rating and cumulative shipments above 310GW. The company behind your warranty is stable and here for the long haul.
The sensible default for most UK homes
The Trina Vertex S+ is the panel we'd recommend for most UK homes in 2026, and it earns that spot honestly. You get newer N-type technology, a tougher dual-glass build, up to 23.0% efficiency, and a 30-year power warranty – all at a keen price of around £59 to £62 ex VAT per panel from a manufacturer you can genuinely trust. It's the sensible, safe, good-value default, and there's a reason most installers quote it.
The trade-offs are minor. Budget panels undercut it slightly on upfront cost, and the newer G3 edges it on efficiency for those who want the best possible system. But for the vast majority of homeowners, neither of those changes the answer: the S+ hits the sweet spot between cost, performance and peace of mind.
Your next step: get at least three quotes from MCS-accredited installers, ask each to confirm the exact Vertex S+ variant and its warranty terms in writing, and compare the cost per installed kilowatt so you can weigh them up fairly. If the S+ is on your quote at a fair price, you're looking at a smart, dependable choice.
