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Canadian Solar CS6.2-66TB-645
Canadian Solar Brand review

CS6.2-66TB-645

645 Wp TOPCon Bifacial 80%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,347 of 14,005
Compare panels Datasheet PDF
Power (Wp)
645
Strong · top 3%
Efficiency (%)
23.90
Strong · top 1%
Density (Wp/m²)
238.8
Strong · top 1%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
32.8
Strong · top 24%
Warranty (yrs)
30
Typical · median 30 yrs

The Canadian Solar TOPBiHiKu6 series is designed to maximize energy gain in installations where every square meter counts and ensure stable production year after year. The key advantage of this lineup lies in combining N-type TOPCon cells with a bifacial structure, enabling the real utilization of reflected light from the ground surface-particularly in ground-mounted PV farms on light-colored surfaces, membrane roofs, or with appropriately selected mounting infrastructure. These modules focus on low degradation (without typical LID losses related to boron) and resistance to phenomena such as PID, translating to more predictable yields and lower long-term operational risks. The application of multi-busbar architecture improves current collection and minimizes the impact of micro-cracks, thereby enhancing reliability in challenging conditions. The TOPBiHiKu6 series is an excellent choice for PV farm investors and the C&I segment, seeking to reduce LCOE and system costs thanks to its high power density and robust module durability.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.90% 22.80% Strong · top 1% 351
Power density 238.8 227.7 Strong · top 1% 356
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 50.9 53.1 Strong · top 24% 4,247
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

8 positive · 2 caution
Best for

Utility-scale, commercial and hot-climate.

Strengths
23.90% module efficiency

Top 1% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 351st in the whole database.

238.8 watts per square metre

Top 1% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 356th in the whole database.

50.9 kg per kWp

Top 24% of the TOPCon 600-650 W segment, against a median of 53.1.

What owners get
N-type TOPCon – Low Degradation and Superior Thermal Performance

N-type cells eliminate the LID (Light-Induced Degradation) phenomenon by removing boron-oxygen pairs, limiting annual degradation to 0.4% versus a typical 0.55% for PERC. A temperature coefficient of -0.29%/°C translates to meaningfully higher real-world energy yield in summer compared to PERC modules of the same nominal power rating.

~80–85% Bifaciality and Energy Yield Premium

Certified bifaciality of 80–85% enables an additional 2–10% energy harvest from reflected irradiance, depending on ground albedo. In ground-mounted arrays on light-colored surfaces or installations with white roofing membranes, this delivers a measurable advantage over monofacial modules at the same installation footprint.

30-Year Linear Power Warranty (0.4%/year)

The manufacturer guarantees no more than 1% degradation in year one and 0.4% per year thereafter, ensuring ≥87.4% of rated power after 30 years. Peer comparables from the AE Solar AURORA ME-132 and HY SOLAR groups do not offer equivalent terms as a manufacturer standard.

DNV: Recommended Service Life of 35–45 Years

Independent organization DNV (formerly DNV GL), following a manufacturing process review, TC600, DH2000, and PID testing (degradation <2%), and a factory audit, recommends assuming a 35–45-year service life in financial models — significantly reducing LCOE compared to the standard 25-year assumption.

BNEF Tier-1 / Bankability Q1 2026

Canadian Solar remains on the BNEF Tier-1 list in Q1 2026 with an annual manufacturing capacity of 61,000 MWp, ensuring bankability for non-recourse financed projects. None of the peer comparables (PolyCrown, AE Solar, HY SOLAR) appear on this list, which has a direct impact on project financing terms.

Trade-offs
Product Warranty of Only 12 Years

The standard materials and workmanship warranty covers 12 years, whereas some premium-segment Tier-1 manufacturers — including Jinko Tiger Neo and LONGi Hi-MO 7 — offer 15 years. For investors with a long time horizon (>20 years), this may be a significant negotiating point at the time of purchase.

Lower-Range Variants Below Market Efficiency

Models in the 490–515 W range (efficiency ~21.7%) fall noticeably short of comparable products: HY SOLAR N-Type TOPCon reaches 23.8%, and PolyCrown Monocrystalline120 achieves 23.32%. Selecting a lower-power variant negates part of the series' technological advantage; for space-constrained projects, variants of ≥600 Wp must be specified without exception.

Notes from the database
  • At 23.9% efficiency, this panel is 1.1pp above typical TOPCon 600-650W modules (median: 22.8%)
  • At 238.8 W/m² power density, this panel generates 11.1 W/m² more per unit area than TOPCon 600-650W median (227.7 W/m²)
  • Temperature coefficient of -0.29%/°C matches the TOPCon 600-650W median
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • In the top 3% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 645 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.90 % Strong Segment median 22.80%
Vmpp · Impp 42.30 V · 15.26 A Operating point at max power
Voc · Isc 50.00 V · 16.26 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.8 kg Strong Strong · top 24%
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.045 %/°C
NOCT 41 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 564 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Canadian Solar CS6.2-66TB-645 645 W 23.90% -0.290 32.8 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.3 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +35 W, lighter, +1.3 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +30 W, lighter, +1.1 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.1 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +50 W, cooler, +1.0 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +0.9 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +0.9 pp
CS6.2-66TB-600HP 600 W 22.20% -0.290 40.6 kg -45 W, heavier, -1.7 pp
CS6.2-66TB-605HP 605 W 22.40% -0.290 40.6 kg -40 W, heavier, -1.5 pp
CS6.2-66TB-610HP 610 W 22.60% -0.290 40.6 kg -35 W, heavier, -1.3 pp
CS6.2-66TB-615HP 615 W 22.80% -0.290 40.6 kg -30 W, heavier, -1.1 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +55 W, cooler, +1.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +25 W, cooler, +0.9 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does Canadian Solar offer on the TOPBiHiKu6 series?
Canadian Solar provides a 12-year product warranty (covering materials and workmanship) and a 30-year linear power output warranty on the TOPBiHiKu6 series. The linear power warranty guarantees predictable, gradual degradation over the entire service life, with no sudden drops in performance. This is one of the longest warranty standards currently available in the market.
What are the benefits of bifacial technology in the TOPBiHiKu6 series, and is the price premium justified?
The bifacial cells in the TOPBiHiKu6 series capture light reflected from the ground surface, achieving a bifaciality factor of up to 85%. In practice, this translates to an additional energy yield of 5–20%, depending on ground albedo. Bifacial technology is particularly cost-effective in ground-mounted systems on high-albedo surfaces, membrane rooftops, or elevated mounting structures where the rear side of the module is exposed to reflected irradiance.
Do the Canadian Solar TOPBiHiKu6 panels perform well on overcast days and in low temperatures?
Yes. The N-type TOPCon technology used in the TOPBiHiKu6 series features a low temperature coefficient of power, which means reduced losses on hot days and improved performance under diffuse winter light. The modules are certified for operation across a temperature range of -40°C to +85°C. Furthermore, the absence of boron doping eliminates Light-Induced Degradation (LID), a phenomenon in older P-type technologies that caused a permanent power loss after initial sun exposure.
What is the maximum power output of the TOPBiHiKu6 series, and what types of installations is it designed for?
The TOPBiHiKu6 series is available in configurations up to 660 Wp, making it a solution primarily designed for utility-scale solar farms and large commercial and industrial (C&I) installations. The high power density reduces the number of modules required per project, lowering balance-of-system (BoS) costs — including cabling, racking structures, and labor — which directly contributes to a reduction in LCOE.
Are the TOPBiHiKu6 panels resistant to mechanical stress and PID?
Yes. The TOPBiHiKu6 modules are certified to withstand snow loads of up to 5,400 Pa and wind loads of up to 3,600 Pa, corresponding to highly demanding weather conditions. The multi-busbar cell architecture (16BB) mitigates the effects of microcracks. The manufacturer also confirms full resistance to Potential-Induced Degradation (PID), which is especially critical in systems operating at high system voltages (up to 1,500 V).
Is Canadian Solar a reliable manufacturer, and is the TOPBiHiKu6 series readily available on the market?
Canadian Solar is a Tier 1 manufacturer, consistently ranked among the world's leading PV module suppliers by independent research institutions, including Bloomberg NEF and Wood Mackenzie. The TOPBiHiKu6 series is actively manufactured and available on the market. The company has a long track record of delivering utility-scale projects and a demonstrated history of honoring warranty obligations.
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