Solar Panel Manufacturers UK 2026 and All 42 Tier 1 Names

All 42 Tier-1 Solar Panel Manufacturers (BloombergNEF Q2 2026)

List reviewed Q2 2026 · page last updated 27 July 2026 · 42 manufacturers · 1023+ GW/yr combined

This is the complete BloombergNEF Tier-1 list as at Q2 2026 — all 42 manufacturers, not a top-ten extract. It is ranked by annual module capacity, the ordering BNEF data is normally read in. The final column is the one no other published version of this list gives you: whether you can actually buy the panel in the UK. A Tier-1 maker with no UK trade channel is not a real option for a British commercial buyer, however bankable it looks on paper.

How to read this table. Capacity is annual nameplate module capacity as published for Q2 2026. Tier-1 since: BloombergNEF publishes no first-appearance or continuous-tenure field, so we show only what is evidenced — “Q2 2026 (new)” for the two confirmed new entrants, and “≤ Q1 2026” for every maker verified on the Q1 2026 list. We will not guess a founding year to fill a column. Available in the UK is our own procurement research, not a BNEF field: Y = established UK trade distribution you can buy through today; N = no UK rooftop channel at all (First Solar sells utility-scale CdTe direct); — = not verified by us, which means unknown, not unavailable.

Sourcing. BloombergNEF gates the full roster behind a subscription, so no free source is authoritative on its own — including this one. The 42-name roster and capacities here are transcribed from the published Q2 2026 compilation and cross-checked against manufacturer announcements (LONGi and VSUN both confirm Q2 2026 Tier-1 status independently; Boviet confirms Q1 2026). The headline facts — 40 to 42, Vikram Solar and Jolywood added, 1023+ GW combined — corroborate across multiple independent sources. BNEF publishes its methodology at assets.bnef.com (dated 18 March 2026) and explains the list at BloombergNEF. Where we could not corroborate a name, we left it off rather than pad the count.

What changed this quarter (Q1 2026 → Q2 2026)

Churn is the entire point of a quarterly list. A Tier-1 list with no change log is just a directory — the useful question is not only who is on it, but who moved. The Q2 2026 release took the list from 40 to 42 manufacturers.

The movers. Vikram Solar (India, 9.5 GW/yr) and Jolywood (China, 4.0 GW/yr) are the two new entrants, and both matter more than their size suggests: Vikram deepens the Indian contingent alongside Waaree, Adani and Tata Power Solar, which is the supply chain diversification a lot of UK buyers have been asking for since 2023. No manufacturer was removed — genuinely unusual, and a sign the bankability bar is being cleared by a widening field rather than a churning one.

The capacity revisions tell you more than the additions. TCL Zhonghuan (TZE) jumped from 20.4 to 35.0 GW/yr, the largest single move on the list. JA Solar was revised down from 100.0 to 88.0 GW/yr — a rare downward revision for a top-five maker, and worth watching rather than worrying about, since JA Solar remains the fourth-largest module maker on earth and our most-specified brand. One naming change is easy to miss and quietly significant: the Q1 2026 list carried an entry reading “TCL / Maxeon / TZE”; in Q2 2026 that entry reads “TCL Zhonghuan / TZE”, with Maxeon no longer named. If you have seen Maxeon described as Tier-1, that grouping is very likely why.

Solar panel manufacturers that actually supply the UK

The list above answers which manufacturers banks will lend against. It does not answer the broader question most people typing solar panel manufacturers into a search box are really asking: who makes solar panels, where are they actually made, and which of them can I buy in Britain. This section answers that, and it starts with the fact almost nobody writing on this subject says out loud — almost no solar panels are manufactured in the UK, and the few that are do not suit a commercial roof.

Of the 42 Tier-1 manufacturers ranked above, we have verified established UK trade distribution for 12. The table below sets those 12 alongside First Solar (Tier-1, but with no UK rooftop channel at all), the two off-list premium makers we specify, and the 4 UK-domiciled companies that come up whenever anyone searches for a British solar panel manufacturer — 19 rows in total. Read “where modules are made” as the module assembly and lamination location, not the origin of the cells inside. That distinction is the whole point of the note underneath the table.

How to read this table. Rows are grouped: the 12 Tier-1 makers marked Y for UK availability in the ranked table at the top of this page, then First Solar (Tier-1 but marked N — it sells utility-scale CdTe direct and has no rooftop channel), then REC Group and Maxeon, which are not on the Q2 2026 Tier-1 list at all but which we do specify, then the 4 British companies, tinted blue. Where modules are made lists only manufacturing locations we could corroborate — a maker may operate plants beyond those shown, and we would rather under-state than invent. UK distribution and availability are our own procurement research, not BloombergNEF fields.

What a “UK solar panel manufacturer” actually means

Be straight about this, because most pages ranking for this query are not. China holds more than 80 per cent of global manufacturing capacity at every stage of the solar supply chain — polysilicon, wafers, cells and finished modules. UK solar panel manufacturing is, next to that, a rounding error: IBISWorld sizes the entire domestic industry at roughly £110 million of turnover across about 28 businesses in 2026. The 42 Tier-1 makers listed at the top of this page build more than 1023 GW of modules a year between them. Nothing in Britain operates within orders of magnitude of that.

There is no volume solar cell or wafer production in the UK at all, and that single fact settles the question. A module can be laminated and assembled in Britain — 3 of the 19 companies above genuinely do that — but the cells inside every one of them are imported. So “British-made panel” means British-assembled, and anyone implying more than that is stretching it.

“British brand” is not the same as “British-made”, and the most British-sounding name proves it. UKSOL is a British company, founded in 2015 and based in Gerrards Cross, Buckinghamshire, and its modules are made in factories in the EU — including an automated plant in Valencia, Spain — as well as Türkiye and China. That is not a criticism of the product. It is simply what the words mean, and a buyer who has written “British panels” into a specification deserves to know it before signing rather than after.

The genuinely UK-assembling makers do not build the module a commercial roof needs. GB-Sol has manufactured in Pontypridd since 1994 — a Cardiff University spin-out, ISO 9001 and ISO 14001 certified, a Made in Britain member — but its speciality is PV slates, roof-integrated and bespoke panels. Viridian Solar has built its Clearline roof-integrated modules near Cambridge since 2004 and now sits inside Marley, part of the Marshalls group; its market is pitched roofs, new-build and retrofit. Polysolar, in Cambridge since 2007, makes transparent building-integrated PV glazing units. All three are good at what they do and none of them makes the 580–670 W double-glass bifacial module that a 250 kW warehouse array is assembled from. One further correction while we are here: AES Solar in Forres makes solar thermal collectors, not PV, and is routinely miscounted as a British panel manufacturer in lists like this one.

Oxford PV, the UK-founded perovskite-on-silicon tandem developer, is the closest thing Britain has to a cell-technology story worth following. It is not, in 2026, a volume supplier of commercial rooftop modules.

The practical conclusion. If your specification says “buy British”, you cannot honestly have it at commercial scale in 2026. What you can have is the thing that actually protects the investment: a manufacturer with a UK or European service entity, a distributor who will process a warranty claim on your behalf, and membership of a WEEE producer compliance scheme so the disposal liability in year 30 is not sitting with you. Those three tests are worth more across a 25-year asset than any flag on the box — and they are exactly why the “Available in the UK” column exists in the Tier-1 table at the top of this page.

How UK commercial buyers actually get hold of these panels

Almost none of these manufacturers sell direct to a British business. They sell to trade wholesalers, who sell to MCS-registered installers, who contract with you. The national PV wholesale channel — Segen, Midsummer Wholesale, Krannich Solar UK, BayWa r.e. UK, Alternergy and Deco Group among others — is where UK stock physically sits, and it is why the “Available in the UK” column matters more to a British buyer than the capacity ranking does. A 120 GW/yr manufacturer with no UK stockholding is slower to source than a 4 GW/yr one with pallets in a Midlands warehouse.

Two consequences for procurement. First, lead time tracks distribution, not factory size — confirm stock before you fix a commissioning date, particularly on the makers marked “—” in the ranked table. Second, your warranty route runs through that same distributor. A claim on a module bought through a UK wholesaler is handled here; a direct-import container from a maker with no UK channel leaves you pursuing the claim in the manufacturer home jurisdiction. That is the most common reason a technically valid warranty turns out to be worth nothing, and it has nothing whatever to do with which tier the maker sits in.

Whichever manufacturer you land on, the commercial numbers behave the same way: a turnkey UK commercial install runs £700–£1,200 per kW, a well-oriented roof yields 900–1,150 kWh per kWp per year, and the capital allowance position is unchanged by brand — solar is special-rate plant, so it does not qualify for Full Expensing, but the Annual Investment Allowance gives 100 per cent relief in year one up to £1m (worth about a quarter of the spend at 25 per cent corporation tax), with the 50 per cent First-Year Allowance as the route above that cap. See the capital allowances guide and the cost guide for the detail.

BloombergNEF Tier-1 — what it really measures

There are over 350 solar panel manufacturers operating worldwide in 2026. The BloombergNEF Tier-1 list — quietly the most important reference document in commercial solar procurement — names 42 of them as at Q2 2026. The other 300-plus either lack the financial bankability data, the manufacturing scale, or the project track record to qualify.

Tier-1 is published quarterly by BloombergNEF as part of its global solar markets analysis. The qualification is narrow: a manufacturer must have supplied panels under their own brand name to at least six different non-recourse-financed solar projects within the past two years, where the project lenders conducted independent technical due diligence on the panel and accepted them. The criterion is purely financial bankability — does the global project finance market believe in this manufacturer enough to lend against their panels? It is not a measure of efficiency, durability, warranty terms, or aesthetic. As LONGi puts it in its own Q2 2026 Tier-1 announcement, the rating mainly assesses enterprises bankability, namely whether their products are eligible for non-recourse debt financing from banks.

That distinction matters, and this page is a live demonstration of it. Some specialist premium manufacturers sit outside Tier-1 because their volume in non-recourse-financed projects is below the bar — even though their panels are demonstrably excellent. REC Group, Maxeon, Suntech are all absent from the Q2 2026 list — and two of the three, REC Group and Maxeon, are panels we actively specify and detail further down this page. We treat Tier-1 as a necessary-but-not-sufficient screen for most work, not as a synonym for a good panel.

What Tier 1 actually means (and what it does NOT mean)

This is the single most valuable thing on this page, and it is the opposite of what most solar sales copy implies. Tier 1 is a bankability and financial-stability ranking. It is not a panel-quality rating, not an efficiency rating, and not a warranty rating. BloombergNEF compiles it for lenders and investors, not for buyers picking a panel.

BloombergNEF says this itself. Its own published guidance on the list cautions that Tier 1 is not a quality benchmark and that the classification should not be used as a proxy for module quality or as a recommendation to buy — it exists to indicate bankability. BNEF has repeatedly asked the industry to stop marketing it as a quality seal. Any installer who tells you "Tier 1 means it's a top-quality panel" is either mis-selling or has not read the methodology.

So why does it still matter to you? Because on a 25-year asset, the warranty is only as good as the company behind it. Tier 1 screens out the covenant risk — the risk that the manufacturer no longer exists when you need to claim in year 14. That is a real and useful screen. It just is not the same thing as the panel being good. Use Tier 1 to build your shortlist, then use efficiency, product warranty length, degradation rate and £ per lifetime kWh to choose within it.

Flagship modules compared (2026 quick-spec)

Having the list is one thing; knowing what each of these manufacturers actually builds is another. This table names the current 2026 flagship module for the nine brands with meaningful UK distribution, with power, efficiency, product warranty and — the column that matters — whether they are actually on the Q2 2026 Tier-1 list. Two of the nine are not, and they happen to carry the two longest product warranties here. That is not a coincidence; it is the whole point.

Power and efficiency are the manufacturer-published ranges for the named flagship range as at Q2 2026; ranges span the variants within each series. Product warranty is the manufacturing-defect warranty, not the performance warranty (see the full comparison below). Note REC Group and Maxeon show “No” — they are absent from the Q2 2026 BloombergNEF list while offering 25-year and 40-year product warranties respectively, the longest in this table. Tier-1 status and panel quality are separate questions. Always confirm the current quarter list and the exact datasheet revision before contracting.

Tier 1 vs Tier 2 vs Tier 3 solar panels

The single most misunderstood point in solar procurement: Tier-1 is a bankability and financial-stability indicator, not a performance or quality rating. BloombergNEF's methodology assesses whether a manufacturer's modules have been accepted by independent project lenders on non-recourse-financed projects — in other words, whether banks will lend against them. It says nothing directly about efficiency, degradation rate, or build quality. A Tier-1 budget line can be outperformed on the roof by a strong Tier-2 premium product. The reason Tier-1 still matters for a 25-year asset is that financial stability is what makes a 25-year warranty actually enforceable.

So the practical rule for a UK commercial buyer is: treat Tier-1 as the entry ticket, not the finish line. Filter to Tier-1 first because it screens out the covenant risk on a long-life asset, then choose within Tier-1 on efficiency, flagship module, warranty length and the £ per lifetime kWh figures in the comparison above. There is no official "Tier 2" or "Tier 3" published list — those are industry shorthand for everything that did not clear the BloombergNEF bankability bar.

The manufacturers we specify in 2026

Seven of the nine below are on the current Tier-1 list; two (REC, Maxeon) are not, and we say so at the top of their entries rather than burying it. Capacity figures here are the Q2 2026 published values, consistent with the ranked table above.

JA Solar — flagship module: DeepBlue 4.0 (JAM72D40, 580-625 W)

Chinese, founded 2005, the fourth-largest module maker by annual capacity at 88 GW/yr as at Q2 2026 — revised down from 100 GW/yr in Q1 2026. Headquarters Beijing, manufacturing in China, Vietnam, Malaysia, and Oman. On the Q2 2026 BloombergNEF Tier-1 list. Default specification across most of our commercial installs in 2026. Flagship product range: DeepBlue 4.0 / JAM72D40 (n-type TOPCon double-glass bifacial) at 580-625 W. Module efficiency 21.5-22.5 percent. Product warranty 12-15 years, performance warranty 25 or 30 years with year-25 retained output 87.4-92 percent. UK distributor presence strong. Pricing band low-to-middle. Real-world UK availability excellent.

Trina Solar — flagship module: Vertex S+ / Vertex N (TSM-NEG21C, 445-720 W)

Chinese, founded 1997, the third-largest module maker by annual capacity at 100 GW/yr. Headquarters Changzhou, manufacturing across China, Vietnam, Thailand, Indonesia. On the Q2 2026 Tier-1 list. Vertex S+ (compact 445-505 W roof module) and Vertex N (TSM-NEG21C, up to 720 W) flagship ranges, n-type TOPCon, sizes 445-720 W across the two ranges — module efficiency 22-22.5 percent on Vertex N and 22.3-22.8 percent on the compact Vertex S+. Product warranty 15-25 years, performance 25-30 years with year-25 retained 87.4-90 percent. UK presence very strong via specialist distributors. Pricing band low-to-middle. Real-world availability excellent. Often the price-competitive alternative to JA Solar at like-for-like specification.

Longi — flagship module: Hi-MO 6 / Hi-MO X6 / X10 (570-640 W)

Chinese, founded 2000, the technology leader on cell efficiency records and joint-largest module maker at 120 GW/yr. Headquarters Xi'an, manufacturing in China, Vietnam, Malaysia. On the Q2 2026 Tier-1 list, which LONGi confirms in its own Q2 2026 announcement. Hi-MO 6 and Hi-MO X6 flagship ranges at 570-640 W with module efficiency 22-23.5 percent, plus the newer Hi-MO X10 (HPBC 2.0) at 620-670 W and 23.0-24.8 percent — the highest module efficiency of any range in our comparison table below. Product warranty 12-25 years, performance warranty 25-30 years. Strong UK presence. Pricing middle band. We specify Longi where the cell efficiency ceiling matters — typically very space-constrained roofs where every kW per square metre counts.

JinkoSolar — flagship module: Tiger Neo (JKM575-635N, 575-635 W)

Chinese, founded 2006, on the Q2 2026 Tier-1 list and joint-largest module maker by annual capacity at 120 GW/yr, level with LONGi. Tiger Neo n-type TOPCon series flagship at 575-635 W. Module efficiency 22-23 percent. Product warranty 15-25 years, performance 25-30 years. Strong global presence including UK. We specify Jinko on price-competitive commercial work where the JA Solar and Trina pricing has tightened.

REC Group — flagship module: Alpha Pure-RX / Alpha Pure-R (430-470 W)

Tier-1 status: REC Group does not appear on the BloombergNEF Tier-1 list as at Q2 2026. This page previously described REC as Tier-1; that was incorrect and we have corrected it. It is not a mark against the panel — REC offers a 25-year product warranty, longer than almost every maker that is on the list. It reflects that Tier-1 tracks non-recourse project-finance volume, which premium, roof-focused makers rarely accumulate.

Norwegian-founded, now Indian-owned by Reliance Industries. Manufacturing in Singapore. Premium positioning. Alpha Pure-RX / Alpha Pure-R flagship range at 430-470 W, HJT (heterojunction) cell technology, module efficiency 22-23 percent at smaller physical sizes (better for roof-shape complexity), 25-year product and 25-year performance warranty as standard with year-25 retained 92 percent. Strong UK distributor presence. Pricing premium-band — typically 15-25 percent above JA Solar like-for-like. Specified by us where 25-year product warranty (not just 12-15) matters or where the smaller physical module footprint is needed — with the covenant question flagged in writing, since an off-list maker has not been through the same lender due-diligence volume.

Maxeon — flagship module: Maxeon 7 / Maxeon 6 (440-470 W)

Tier-1 status: Maxeon does not appear on the BloombergNEF Tier-1 list as at Q2 2026. The Q1 2026 list carried a grouped entry reading “TCL / Maxeon / TZE”, which is very likely the source of the widespread claim that Maxeon is Tier-1; in Q2 2026 that entry reads “TCL Zhonghuan / TZE” and Maxeon is not named. Maxeon remains the longest-warrantied module we can specify, at 40 years.

Spun out from US-based SunPower in 2020, headquartered Singapore. The most premium specification we offer. Maxeon 7 and Maxeon 6 flagship ranges at 440-470 W with proprietary back-contact (IBC) cell architecture (no front-side busbars, eliminates the dominant degradation pathway). Module efficiency 22-23 percent. Industry-leading warranty: 40-year product and 40-year performance with year-40 retained 88.3 percent. UK distributor presence growing. Pricing premium-premium — typically 30-50 percent above JA Solar at like-for-like wattage. Specified by us where 40-year asset life matters — long-lease commercial buildings, public-sector procurement with extended depreciation, ESG flagship projects. A 40-year warranty is only as strong as the entity behind it, so on an off-list maker we put that question in front of the client rather than around it.

Canadian Solar

Canadian-founded, Chinese-owned manufacturing footprint. On the Q2 2026 Tier-1 list, sixth-largest by capacity at 61 GW/yr. HiHero and HiKu series. Module efficiency 21-22.5 percent. Product warranty 12-15 years, performance 25 years. UK availability good through specialist distributors. Pricing middle band. We specify Canadian Solar on price-competitive commercial work where availability matters more than the absolute lowest cost.

Q CELLS

South Korean, owned by Hanwha Group. Manufacturing in South Korea, Malaysia, the United States. On the Q2 2026 Tier-1 list at 11.2 GW/yr. Q.PEAK DUO and Q.TRON flagship ranges. Module efficiency 21-22 percent. Strong product warranty 12-25 years, performance 25 years with year-25 retained 86 percent (Q.PEAK) or 90.6 percent (Q.TRON premium). UK presence strong with German engineering reputation. Pricing middle-to-upper band. Specified by us where the buyer wants German-engineered specification and the Korean-Hanwha financial covenant.

Aiko Solar — flagship module: Neostar 2P / ABC (445-630 W)

Chinese, headquartered Shenzhen. On the Q2 2026 Tier-1 list at 35.5 GW/yr, ninth-largest by capacity. Newest premium entrant — Neostar (2P and commercial) flagship range at 445-630 W on proprietary ABC (All Back Contact) cell architecture analogous to Maxeon's IBC technology. Module efficiency 23-24 percent at the top of the global commercial range. Product warranty 15-25 years, performance 30 years. UK availability building rapidly through 2025-2026. Pricing upper band. We specify Aiko on aesthetic-led and space-constrained projects where every percentage point of efficiency translates directly to revenue.

Side-by-side comparison

This table names the flagship module for each of the nine manufacturers we specify — seven on the Q2 2026 Tier-1 list, plus REC and Maxeon which are not — alongside efficiency, warranty, pricing band and our estimated £ per lifetime kWh: the whole-of-life cost metric that puts the headline panel price in proportion to what the array actually generates.

How we work the £/kWh out (worked example, our own estimate — not a quotation). We divide the all-in turnkey installed cost per kW — the £700-£1,200 per kW band set out below, apportioned across the pricing bands — by lifetime output per kW. Lifetime output uses a single UK generation assumption of ≈950 kWh per kWp per year over 25 years, derated 0.5 percent a year for linear degradation, which gives ≈22,300 kWh per kW. So a £750/kW mainstream install works out at 750 ÷ 22,300 ≈ £0.034 per lifetime kWh. Two caveats worth stating plainly: this is a cost metric, so on it a cheaper panel will always look better — warranty length, efficiency per square metre and covenant strength are separate axes you weigh alongside it, not inside it. And a south-facing unshaded roof will beat 950 kWh/kWp while a shaded or east-west roof will fall short, so treat the bands as ranking the options against each other rather than as a figure for your own site.

Verdict: for a typical UK commercial install (≈£700-£1,200 per kW turnkey, generating ≈900-1,150 kWh per kWp per year, with ≈950 the planning assumption used above), a mainstream Tier-1 module at ≈£0.031-0.040 per lifetime kWh is the rational default. Pay up into the premium and performance bands only when efficiency-per-square-metre, warranty length or ESG covenant is the binding constraint. Model your own numbers with the commercial solar savings calculator.

What to look for beyond Tier-1

Six specification details matter on commercial procurement and sit alongside the Tier-1 status check.

Linear performance warranty, not stepped. Modern Tier-1 manufacturers issue linear warranties — annual degradation 0.4-0.55 percent per year for 25-30 years with a defined year-25 retained output. Older or budget brands sometimes use stepped warranties — a sharp drop in year 1 (typically 2-3 percent) and then linear from there. Linear is materially better for the customer because the year-1 step is the dominant degradation event under stepped warranties.

Product warranty length. Product warranty is the manufacturing-defect warranty. 12 years is the budget-Tier-1 floor in 2026; 15 years is mainstream; 25 years is premium (REC) and 40 years is premium-premium (Maxeon). The longer the product warranty, the longer you have meaningful protection against manufacturing defects (junction-box failures, microcracks, cell degradation) that the manufacturer pays to fix.

IEC 61215 and IEC 61730 certification. The two international standards covering solar panel design qualification, type approval, and safety. Both must be current and in date. UK MCS-certification additionally requires meeting these as the foundation.

Mechanical load ratings. Modern Tier-1 panels rate to 5400 Pa snow load and 2400 Pa wind load. UK commercial roofs rarely test the upper bound but exposed coastal and Scottish highland sites benefit from headroom.

Salt mist and ammonia resistance. IEC 61701 (salt mist) and IEC 62716 (ammonia) certifications matter on coastal sites within 5 km of the sea and on agricultural and dairy sites. Most Tier-1 panels carry both; budget brands often skip one.

UK distributor presence and warranty servicing. The Tier-1 list does not differentiate manufacturers by their UK service capability. We separately verify that the manufacturer has either a direct UK or European service entity or a distributor that handles warranty claims locally. JA Solar, Trina, REC, Maxeon, Q CELLS, and Canadian Solar all have strong UK service infrastructure. Some Tier-1 brands have weaker UK presence and we either avoid them or specify them only where the customer has explicitly signed off.

UK-specific risks worth knowing

Anti-dumping duties: not a UK risk in 2026. The EU lifted Chinese-panel anti-dumping duties in 2018. The UK retained the framework but did not reimpose. There are no import tariffs on solar panels from China, the US, India, Korea, or anywhere else into the UK as of 2026. The position is materially different from the United States, which under the IRA has imposed steep tariffs on Chinese cells and panels.

Warranty enforceability. A 25-year linear performance warranty is only worth the financial covenant of the entity issuing it. The Chinese majors (JA Solar, Trina, Longi, Jinko) have good covenants but the warranty must be actioned through a UK or European distributor — direct claims to China are operationally challenging. We always specify panels through distributors with verified UK service capability.

End-of-life and recycling. The UK Waste Electrical and Electronic Equipment (WEEE) Regulations 2013 require manufacturers and importers to fund the cost of solar panel disposal at end-of-life. Most Tier-1 manufacturers are signed up to PV Cycle or equivalent producer compliance schemes. Specifying out-of-scheme manufacturers shifts disposal cost and risk to the building owner in 25-30 years time.

Authority sources

BloombergNEF Tier-1 list explanation at BloombergNEF. MCS certified products list at MCS Certified. IEC standards at IEC.

Related decision pages

For the underlying Tier-1 framework see tier-1 solar panels UK. For inverter selection see best commercial solar inverters and string vs microinverter. For panel technology see solar panel efficiency UK, monocrystalline vs polycrystalline, and solar panel degradation. For warranty in detail see commercial solar warranty. For costs see cost guide and payback calculator.