Qcells vs Canadian Solar: Specs, Warranties and US Manufacturing Compared

Qcells vs Canadian Solar is a close call on paper: both sell all-black residential panels in the 415 to 465 W range with similar heat ratings, and both now build panels in the US. Qcells' Q.TRON BLK M-G2+ guarantees more output at year 25 and beats the 435 W Canadian Solar model on efficiency, while Canadian Solar's TOPHiKu6 All-Black offers higher-wattage options and a 30-year performance warranty. For most homeowners, the installer, the price per watt and the warranty conditions matter more than which of these two brands is on the roof.

Key takeaways

• The Qcells Q.TRON BLK M-G2+ datasheet lists 415–440 W and up to 22.5% efficiency. Canadian Solar's TOPHiKu6 All-Black (CS6.1-54TM) series lists 440–465 W.
• Qcells guarantees at least 90.58% of rated output at year 25. Canadian Solar guarantees 87.5% at year 30 (per EnergySage), which works out to about 89.4% at year 25 by our math.
• Qcells lists a 25-year product warranty. Canadian Solar's datasheet says its 25-year product warranty applies only to certain rooftop installations in certain regions.
• Both companies have US factories. Check the exact part number and datasheet to know where your panels were made.

Qcells vs Canadian Solar: spec comparison

The table compares one current residential panel from each brand, using the Qcells Q.TRON BLK M-G2+ datasheet (Rev06, March 2025), the Canadian Solar TOPHiKu6 All-Black datasheet for the 440–465 W series (v1.1, November 2024) and EnergySage's listing for the 435 W model (CS6.1-54TM-435).

Spec	Qcells Q.TRON BLK M-G2+	Canadian Solar TOPHiKu6 All-Black
Power range	415–440 W	440–465 W (CS6.1-54TM series); 435 W model also listed
Cell type	Monocrystalline Q.ANTUM NEO half cells, 108 cells	N-type TOPCon (series datasheet); 108 monocrystalline cells (435 W model, per EnergySage)
Efficiency	Up to 22.5%	21.3% (435 W model); ask for the exact model's datasheet for 440–465 W versions
Temperature coefficient (Pmax)	−0.30%/°C	−0.29 (435 W model, as listed by EnergySage)
Size and weight	67.8 × 44.6 × 1.18 in; 46.7 lb	1800 × 1134 × 35 mm (about 70.9 × 44.6 × 1.38 in) for the 435 W model
Product warranty	25 years	25 years on materials (EnergySage); the datasheet limits this term to rooftop installations in certain regions
Performance warranty	25 years; ≥98.5% in year 1, ≤0.33%/yr after; ≥90.58% at year 25	30 years; ≤1% loss in year 1, ≤0.4%/yr after; 87.5% at year 30
Where made (per datasheet)	No country named; says it "contains U.S. manufactured components"	"Assembled in the US from imported components"

Efficiency and power: which makes more electricity?

Higher efficiency means more watts from the same roof area. The Qcells panel's 22.5% top efficiency is a bit higher than the 21.3% EnergySage lists for the 435 W Canadian Solar model. That 435 W model is also physically larger: 1,800 mm long versus 1,722 mm for the Qcells panel, about 3 inches more, at the same width. Canadian Solar's 440–465 W versions make more power per panel; check the datasheet for the exact model to compare efficiency.

What this means for you:

• Small or crowded roof: A more efficient panel can fit more power in the space.
• Plenty of roof: Efficiency matters less than price per watt. A slightly larger, lower-efficiency panel can produce the same energy.
• Panel count: Higher-wattage panels mean fewer panels, and possibly fewer microinverters or optimizers, for the same system size.

To see how many panels of each size you'd need, use our solar panel calculator.

Heat performance

Both panels have similar temperature coefficients: −0.30% per °C for Qcells and −0.29 for the Canadian Solar 435 W model. In practice, they'll lose output at nearly the same rate on hot days. Neither has a meaningful edge in hot climates based on these numbers.

Both are all-black designs, which tend to run a little hotter than panels with white backsheets. That affects both brands equally here.

Warranty terms: Qcells vs Canadian Solar

This is where the two differ most.

Product warranty

Qcells lists a 25-year product warranty on the Q.TRON BLK M-G2+ datasheet. Canadian Solar's TOPHiKu6 All-Black datasheet also lists a 25-year limited product warranty, but it says that term is available only for certain rooftop installations in certain regions. Ask your installer to show you the warranty document that applies to your address.

Performance warranty

Canadian Solar's performance warranty runs longer (30 years vs 25), but it allows more loss per year (the year-25 figure below is a worked example):

• Qcells: at least 98.5% in year 1, no more than 0.33% a year after that, at least 90.58% at year 25.
• Canadian Solar: no more than 1% loss in year 1, then up to 0.4% a year, ending at 87.5% at year 30.

Applying Canadian Solar's stated rates, the guaranteed minimum at year 25 is about 89.4%, slightly below Qcells' 90.58%. After year 25, Qcells' guarantee ends while Canadian Solar's continues for five more years. For comparison, a 2013 NREL study of nearly 2,000 measured rates put the median at 0.5% a year, so both warranties promise slower aging than that.

Labor and claims

Neither datasheet promises to pay the labor to remove and replace a failed panel. That cost often falls to you or your installer's workmanship warranty. If your installer goes out of business, you'll need to file a claim with the manufacturer directly, so keep the datasheet, warranty document, serial numbers and proof of installation date together.

Independent testing for Qcells and Canadian Solar

Datasheets tell you what a panel should do. Independent tests show how designs hold up under stress. Kiwa PVEL publishes an annual PV Module Reliability Scorecard with a free online Top Performer search tool. Solar Power World reported that the 2026 edition named 43 Top Performer manufacturers, while 87% of manufacturers and 61% of tested bills of materials (specific component combinations) had at least one failure. Because tests are run on specific bills of materials, search for the exact model in your quote rather than the company name alone.

US manufacturing

Both brands have built up US production:

• Qcells: Its Dalton, Georgia module plant was expanded to 5.1 GW in late 2023. In June 2026, Qcells said its Cartersville, Georgia factory had started making solar cells and would produce ingots, wafers, cells and modules, with 3.3 GW of cell and 3.5 GW of module capacity a year by Q3 2026.
• Canadian Solar: Solar Power World reported in May 2026 that it operates a 5 GW panel assembly plant in Mesquite, Texas, is targeting 10 GW in the second half of 2026, and has a heterojunction cell plant in Jeffersonville, Indiana with 2.1 GW of capacity this year. It also expected to supply the US from both domestic and global sites.

A brand having US factories doesn't guarantee your specific panels were made there. If origin matters to you, ask for the part number and check the datasheet. Our guide to American-made solar panels explains how to read "Made in USA" claims.

Which should you choose?

Qcells may fit better if:

• You want the stronger 25-year output guarantee and a compact, efficient panel.
• You want a 25-year product warranty without regional conditions on the datasheet.

Canadian Solar may fit better if:

• Your installer offers a lower price per watt.
• You value a performance warranty that runs to year 30.
• You want higher-wattage panels and have room for their larger size.

Either way, focus on total installed cost. The federal residential clean energy credit (Section 25D) is not allowed for expenditures made after December 31, 2025, which for solar means systems whose installation was completed after that date (IRS). For another comparison, see Qcells vs REC.

Next steps

Read our Qcells company profile for more on the manufacturer, and compare installers that offer either brand on our solar companies pages. When you have quotes, ask for each panel's datasheet and warranty document, and check the price with our solar quote checker.