JA Solar, Canadian Solar, Longi, Jinko and Trina are five of the best-known panel makers in the world, and four of them are easy to find on South African retailer shelves. If your quote names one of them, the brand itself is rarely the problem. What separates a good panel choice from a poor one is the exact model: its warranty terms, how fast it is guaranteed to lose power, the cell technology inside it, and what you pay per watt.
So this guide doesn't hand out a ranking. It compares the five brands against criteria you can check yourself, using each maker's own datasheet and SolarGuide's dated retail price data. By the end you should be able to look at any panel line on a quote and tell whether it meets the standard.
Key takeaways
The current n-type panels from Jinko, Trina, JA and Canadian Solar carry near-identical warranties: 12 years on the product and 30 years on power, guaranteeing about 87.4% of rated output at year 30.
Longi's back-contact Hi-MO X10 is the outlier on paper, with a lower 0.35% annual degradation figure and 24.8% efficiency, but we found no current South African retail listing for it.
"Tier 1" is a BloombergNEF bankability list, not a quality score. It tells you banks have financed large projects using the brand.
In SolarGuide's Solar Price Index Q3 2026, JA, Jinko and Trina 585W to 630W panels all sat between R3.13 and R3.52 per watt. Brand made almost no difference to price.
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The criteria that actually separate panels
A useful comparison weighs the things that change your outcome over 25 years or more:
Product warranty: how long the maker covers defects in materials and workmanship.
Performance warranty and degradation: how much power the maker guarantees the panel will still produce, year by year.
Cell technology: TOPCon, back contact (BC) or heterojunction (HJT), which affects efficiency, heat tolerance and degradation.
Bankability: whether the company is financially solid enough to honour a warranty in year 20. This is where "Tier 1" comes in.
Certification: whether the exact model is certified to IEC 61215 and IEC 61730.
Local availability and support: whether you can buy it here, and who handles a claim.
Price per watt: what you pay for each watt of rated power.
Wattage is deliberately missing from that list. A 620W panel isn't better than a 590W panel; it's bigger. Our solar panel wattage guide explains what the rating means and how to judge an array by total kilowatts.
The five brands side by side
The table compares a current flagship n-type model from each brand, using the maker's own datasheet or product page.
Brand and model
Cell technology
Power range
Efficiency
Product warranty
Power warranty
Year-1 / annual degradation
Weight
Jinko Tiger Neo (JKM605-630N-66HL4M-BDV)
n-type TOPCon, bifacial dual glass
605W to 630W
22.40% to 23.32%
12 years
30 years, 87.4%
1% / 0.40%
32.4kg
Trina Vertex N (TSM-NEG19RC.20)
n-type i-TOPCon, bifacial dual glass
610W to 635W
22.6% to 23.5%
12 years
30 years, 87.4%
1% / 0.4%
33.0kg
JA Solar DeepBlue 4.0 (JAM72D40 575-600/LB)
n-type, bifacial double glass
575W to 600W
21.7% to 22.7%
12 years
30 years, 87.4%
1% / 0.4%
32.5kg
Canadian Solar TOPBiHiKu6 (CS6.2-66TB)
n-type TOPCon, bifacial dual glass
635W to 640W
23.5% to 23.7%
12 years
30 years
1% / 0.4% (maximum)
32.8kg
Longi Hi-MO X10
n-type back contact (HPBC 2.0)
up to 670W
up to 24.8%
not stated in launch material
30 years
1% / 0.35%
not stated
Sources: manufacturer datasheets and product pages linked below, checked on 22 October 2026. The JA datasheet is marked "Preliminary" by JA Solar. Longi figures come from its Hi-MO X10 launch announcements.
Read that table and the main finding is how similar the four TOPCon panels are. Jinko, Trina, JA and Canadian Solar all offer 12 years of product cover and a 30-year power guarantee with the same shape: no more than 1% loss in the first year, then no more than 0.4% a year. All four quote a temperature coefficient of about -0.29% to -0.30% per °C, which matters on a hot South African roof.
What the degradation numbers mean in practice
A 1% first-year loss followed by 0.4% a year for the next 29 years leaves 87.4% of the original rating at year 30. That's the figure Jinko, Trina and JA print on their warranty charts. On the same arithmetic, Longi's 0.35% annual figure would leave about 88.9% at year 30. That is our calculation from Longi's published rates, not a figure Longi states.
Longi Hi-MO X10 (0.35%/yr)88.9 %
Jinko, Trina, JA, Canadian Solar (0.4%/yr)87.4 %
Guaranteed minimum output at year 30, % of rated power (SolarGuide calculation from manufacturer warranty terms)
For a 5kW array, the gap between 87.4% and 88.9% is 75W by year 30. Real, but small, and only useful if you can buy the panel and claim on the warranty here.
The older Canadian Solar panels on SA shelves
Canadian Solar is a special case for South African buyers. The brand's current flagship is the bifacial TOPCon panel in the table, but the Canadian Solar panels we found on South African retail sites on 22 October 2026 were older or smaller ranges: the HiKu6 405W, 450W and 460W mono PERC panels on Sustainable.co.za, and a TOPHiKu6 555W TOPCon panel on SunStore. The HiKu6 460W is a p-type PERC panel with 21.3% efficiency and a temperature coefficient of -0.34% per °C, so it loses more output in heat than the n-type panels above. SunStore lists 12-year product and 30-year power warranties on the TOPHiKu6 555W. If a quote says "Canadian Solar", ask for the exact model code, because the range spans two technology generations.
Cell technology: TOPCon, back contact and HJT
All five brands now sell n-type cells, which suffer less light-induced degradation in the first months than the older p-type PERC cells. Within n-type there are three technologies you'll see named:
TOPCon (tunnel oxide passivated contact) is the mainstream choice. Jinko's Tiger Neo, Trina's Vertex N, JA's DeepBlue 4.0 and Canadian Solar's TOPBiHiKu6 all use it. Jinko's datasheet credits TOPCon with "lower LID/LeTID degradation and better low light performance".
Back contact (BC) moves all the electrical contacts to the back of the cell, so nothing shades the front. Longi's Hi-MO X10 uses its HPBC 2.0 version and claims 24.8% module efficiency, a -0.26% per °C temperature coefficient, and a "shading optimizer" that it says cuts power loss from partial shade by 70% compared with TOPCon. Those are Longi's claims, not independent test results.
Heterojunction (HJT) layers thin amorphous silicon over the cell. None of the five brands' panels in our retail checks used it. An NREL analysis puts typical HJT bifaciality at 0.85 to 0.95, higher than other cell types.
For a typical unshaded, north-facing South African roof, the efficiency gap between TOPCon and BC mostly shows up as fewer panels for the same kilowatts. It matters most when roof space is tight or the roof is partly shaded.
What "Tier 1" means and who publishes it
"Tier 1" is one of the most loosely used phrases in solar sales. It comes from BloombergNEF (BNEF), which publishes a quarterly Tier 1 list of module makers. BNEF's own methodology page sits behind its subscriber service, so we couldn't check it directly. Manufacturers describing their inclusion in August 2026 summarise the method consistently:
It measures bankability: whether banks have lent against projects that use the maker's panels.
A maker must have supplied own-brand, self-manufactured modules to at least six projects financed by six different commercial banks on a non-recourse basis in the past two years.
Only project financings above 10MW count.
Non-recourse means the bank can only recover its money from the project itself, so a bank lending that way is signalling confidence in the equipment and the maker behind it.
That's useful for a homeowner in one way: a Tier 1 maker is more likely to still exist when you need a warranty claim in year 15. But Tier 1 is not a quality test. It says nothing about how a specific panel model performs on your roof, and makers move on and off the list each quarter. Longi's Hi-MO X10 brochure, for example, cites Tier 1 status from "BNEF 1Q 2024", which tells you about that quarter only.
The practical rule: treat Tier 1 as a minimum filter, then compare the model-level criteria in this guide. If a quote claims Tier 1, ask which quarter's list it refers to.
Certifications to check
Every panel on a South African roof should be certified to two international standards:
IEC 61215 covers design qualification: the panel survives tests such as thermal cycling, damp heat, mechanical load and hail impact.
IEC 61730 covers electrical and fire safety.
All four TOPCon datasheets list both. Jinko quotes the recent editions (IEC 61215:2021 and IEC 61730:2023), and Jinko and Trina also list IEC 61701 (salt mist) and IEC 62716 (ammonia), which matter near the coast and on farms. Canadian Solar's datasheet notes its panel was tested with 35mm ice balls under IEC 61215, and warns that not every listed certificate applies to every market. That's why you should ask for the certificate for the exact model being installed, not the brand's general claim.
Local availability and support in South Africa
A panel is only a sensible choice if you can buy it, and claim on it, here. From SolarGuide's Solar Price Index Q3 2026 and retailer checks on 22 October 2026:
JA Solar, Jinko and Trina were widely listed across Solar Shop, Sustainable.co.za, SunStore and other retailers, mostly as 585W to 635W bifacial dual-glass TOPCon panels.
Canadian Solar was listed in its older HiKu6 PERC range and a 555W TOPCon panel, not its current 600W-class bifacial range.
Longi: we found no current listing at Sustainable.co.za, SunStore or Inverter Warehouse, and the price index had none.
Support is the part brand debates skip. A panel warranty claim usually runs through the installer and the local distributor, not directly to the factory. Before you sign, ask who will lodge a claim if a panel fails in year 8, and who covers the labour to remove and replace it. The manufacturer's product warranty normally covers the panel; the installer's workmanship warranty covers the installation.
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Price per watt lets you compare panels of different sizes fairly. These figures come from the 585W to 630W panel listings in SolarGuide's Solar Price Index Q3 2026, checked on 26 September 2026. They are panel-only, VAT-inclusive online prices and exclude mounting, cabling, inverters and installation.
Brand
VAT-inclusive listings
Median price per watt
Range
Jinko
8
R3.33
R3.13 to R3.40
JA Solar
6
R3.34
R3.13 to R3.52
Trina
2
R3.29 (midpoint)
R3.22 to R3.36
Canadian Solar
0 in the index
n/a
n/a
Longi
0 in the index
n/a
n/a
Price per watt is a SolarGuide calculation from listed prices. Two further JA listings whose VAT treatment wasn't stated are excluded. Sustainable.co.za shows most prices as a sale against a higher "regular" price.
JA SolarR3.34
JinkoR3.33
TrinaR3.29
Median retail price per watt, 585W to 630W panels, Solar Price Index Q3 2026 (checked 26 September 2026)
The spread between brands is about 5 cents a watt, or roughly R250 on a 5kW array. The spread within a brand, from one retailer to another, is bigger. Shopping on price per watt for the same model matters more than choosing between these three badges.
For the older Canadian Solar panels, our wattage guide found the HiKu6 460W at about R4.03 per watt and the TOPHiKu6 555W at about R4.41 per watt on 20 October 2026, both well above the 600W-class median.
So which brand is best?
On the evidence, there's no single best brand for South African homes:
Jinko, Trina and JA are the default choice for a typical roof. Their current panels match on warranty and degradation, all are widely stocked, and they cost about the same per watt. For a closer look at the two most common, read Trina vs Jinko solar panels.
Canadian Solar is a sound maker, but check the model. A HiKu6 PERC panel is an older technology at a higher price per watt than current n-type panels.
Longi has the strongest paper specification of the five, but you can't easily buy its current back-contact panels through the South African retailers we checked.
Most installers specify panels as part of a package. Alumo, SolarGuide's installation partner, uses 615W panels in its rent-to-own packages and 655W panels in its subscriptions, and confirms the exact equipment in the quote. Ask for the panel model code and datasheet, and check it against the criteria above.
There isn't one best brand. The current n-type panels from Jinko, Trina and JA Solar have the same 12-year product and 30-year power warranties, similar efficiency and near-identical prices per watt in SolarGuide's Q3 2026 price index. Choose on the exact model's warranty, certification, price per watt and local support.
Are Canadian Solar panels good?
Canadian Solar's current TOPBiHiKu6 panels carry 12-year product and 30-year power warranties with the same degradation limits as Jinko, Trina and JA. The Canadian Solar panels we found in South African retail on 22 October 2026 were mostly its older HiKu6 PERC range, which costs more per watt and loses more output in heat. Check the model code on your quote.
What does Tier 1 mean for solar panels?
It means the maker appears on BloombergNEF's Tier 1 list, which is based on bankability: its own-brand panels have been used in at least six projects financed by six different banks on a non-recourse basis in the past two years. It is a financial-stability filter, not a measure of panel quality, and the list changes every quarter.
Is Longi available in South Africa?
We found no current Longi panel listing at Sustainable.co.za, SunStore or Inverter Warehouse on 22 October 2026, and SolarGuide's Q3 2026 price index recorded none. If an installer offers Longi, ask for the exact model and who handles warranty claims locally.
Is SolarGuide the installer?
No. SolarGuide is an independent referral partner. Alumo supplies, installs, finances and warrants the systems. We help you compare options and get a free quote. All pricing is indicative and subject to a site assessment and credit approval.
SolarGuide is an independent referral partner. We help you compare options and arrange a free quote — Alumo supplies, installs, finances and warrants the systems. Pricing is indicative, sourced from Alumo’s published catalogue, and subject to a site assessment and credit approval.
