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Canadian Solar Brand review

CS3U-370P

370 Wp PERC
ComparePV verdict

Middle of its segment, needs the roof space

Rank 12,943 of 14,005
Compare panels Datasheet PDF
Power (Wp)
370
Typical for its class
Efficiency (%)
18.70
Weak · bottom 10%
Density (Wp/m²)
186.5
Weak · bottom 9%
Temp (%/°C)
-0.360
Typical · median -0.350
Weight (kg)
22.5
Weak · 1.1 kg above median
Warranty (yrs)
25
Typical · median 25 yrs

The KuMax series from Canadian Solar is a proven solution for rooftop and ground-mount installations where the balance between price and reliability matters most. The panels use monocrystalline PERC cells in a half-cut configuration with a multi-busbar design, which reduces resistive losses and improves resistance to microcracks and partial shading. Thanks to low internal current technology, the modules maintain stable output even under weaker irradiance conditions, translating into real gains in annual energy yield. KuMax stands out with its reinforced frame of increased thickness, engineered for installations exposed to heavy snow and wind loads - making it an attractive option for sites in more demanding climates. Production includes rigorous component testing and 100 percent EL testing of every panel, minimizing the risk of factory defects. The panels also feature PID resistance, ensuring stable performance throughout the entire service life. The KuMax series works well both in residential prosumer installations and commercial PV farm projects, wherever predictable LCOE and long-term investment durability are priorities.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 18.70% 19.90% Weak · bottom 10% 13,058
Power density 186.5 199.0 Weak · bottom 9% 13,061
Temperature coefficient -0.360 -0.350 Typical 12,345
Weight per kWp 60.8 55.8 Weak · bottom 23% 12,539
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 7 caution
Best for

Residential, commercial, shaded-installations and cold-climate.

Not ideal for

Roofs where every square metre has to count, tight roof space and weight-limited structures.

Watch-outs
186.5 watts per square metre

Bottom 9% of the PERC 350-400 W segment, against a median of 199.0. Ranked 13,061st in the whole database.

18.70% module efficiency

Bottom 10% of the PERC 350-400 W segment, against a median of 19.90%. Ranked 13,058th in the whole database.

60.8 kg per kWp

Bottom 23% of the PERC 350-400 W segment, against a median of 55.8.

What owners get
Half-cut cells with multi-busbar design

The combination of half-cut PERC cells with a multi-busbar interconnection reduces resistive losses and significantly mitigates the impact of micro-cracks and partial shading on module output, which is particularly valuable for rooftop installations with partial shading from chimneys or antennas.

Low temperature coefficient

A power temperature coefficient of -0.36%/°C combined with a low NMOT of 42±3°C means a smaller output drop on hot days compared to typical PERC panels (usually -0.38% to -0.41%/°C), translating into higher summer energy yield.

Reinforced frame - high mechanical resistance

KuMax panels are certified for snow loads up to 5400 Pa and wind loads up to 3600 Pa, well above standard industry values (typically 2400 Pa/5400 Pa for many competing modules), making them a solid choice for high-snowfall regions.

Tier-1, bankable manufacturer since 2001

Canadian Solar is a Tier-1 manufacturer with over 20 years of market presence, ensuring project bankability for installations using this series and lower risk for institutional investors and financing banks.

100% EL testing and PID resistance

Every panel undergoes 100% electroluminescence (EL) testing, and PID (Potential Induced Degradation) resistance ensures stable power parameters throughout the module's operational life, minimizing the risk of hidden factory defects.

Trade-offs
Production discontinued

The KuMax series was discontinued in 2022 after 5 years on the market (launched in 2017), meaning limited availability of replacement parts and the need to source compatible substitutes in case of warranty claims or damage to individual modules in an existing installation.

Efficiency below segment leader

The maximum efficiency of 20.2% is lower than the competing Heliene 108HC M10 SL All Black (20.5% at the same 400 Wp rating), meaning slightly lower power yield per roof area for space-constrained installations.

12-year product warranty below current standards

The 12-year product warranty is shorter than what many Tier-1 manufacturers now offer (15-25 years for newer N-type/TOPCon series), a meaningful factor when comparing against currently available alternatives on the market.

PERC technology without bifacial option

The series is based exclusively on PERC technology without a bifacial option, missing out on the additional energy yield from ground-reflected light available in the manufacturer's newer TOPCon/HJT series.

Notes from the database
  • Module efficiency of 18.7% is 0.8pp below average for PERC 0-400W panels (median: 19.4%)
  • At 186.5 W/m², this panel generates 7.9 W/m² less per unit area than PERC 0-400W median (194.4 W/m²)
  • At -0.36%/°C, hot weather performance is typical for PERC 0-400W panels
  • At 22.5 kg, this panel is 2.0 kg heavier than the PERC 0-400W median (20.5 kg) - more demanding for installation crews
  • #13058 for efficiency, #12345 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 370 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 18.70 % Weak Segment median 19.90%
Vmpp · Impp 40.00 V · 9.26 A Operating point at max power
Voc · Isc 47.40 V · 9.83 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2000×992×35 mm · 1.98 m² of roof
Weight 22.5 kg Weak Weak · 1.1 kg above median
Cells 144 · PERC Polycrystalline
Coefficient Pmax -0.360 %/°C Typical median -0.350 of its segment
Coefficient Voc · Isc -0.280 · 0.050 %/°C
NOCT 42 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs

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
-

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

Heat losses
-0.360 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Canadian Solar CS3U-370P 370 W 18.70% -0.360 22.5 kg You are here
LNSU-410M 410 W 20.31% -0.360 24.5 kg +40 W, heavier, +1.6 pp
LNSK-340M 340 W 20.08% -0.360 21.0 kg -30 W, lighter, +1.4 pp
LNSU-405M 405 W 20.06% -0.360 24.5 kg +35 W, heavier, +1.4 pp
CS3K-330P 330 W 19.90% -0.360 18.5 kg -40 W, lighter, +1.2 pp
CS3K-335MB-AG 335 W 19.90% -0.360 22.3 kg -35 W, +1.2 pp, +5 yr warranty
CS3U-395P 395 W 19.90% -0.360 22.5 kg +25 W, +1.2 pp
LNSU-400M 400 W 19.81% -0.360 24.5 kg +30 W, heavier, +1.1 pp
LNSK-335M 335 W 19.78% -0.360 21.0 kg -35 W, lighter, +1.1 pp
CS3U-355P 355 W 17.90% -0.360 22.5 kg -15 W, -0.8 pp
CS3U-360P 360 W 18.20% -0.360 22.5 kg -10 W, -0.5 pp
CS3U-365P 365 W 18.40% -0.360 22.5 kg -0.3 pp
CS3U-375P 375 W 18.90% -0.360 22.5 kg Very close match
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +105 W, +5.3 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +100 W, +5.0 pp, +15 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg +95 W, +4.8 pp, +15 yr warranty
NS-420MH-80 420 W 22.28% -0.290 20.0 kg +50 W, cooler, +3.6 pp

Found 124 panels of the same or similar size to this one, within ±10 mm. See them here Found 260 panels of the same or similar size to this one, within ±25 mm. See them here Found 455 panels of the same or similar size to this one, within ±50 mm. See them here Found 719 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Are Canadian Solar KuMax panels still available for purchase?
The KuMax series has been discontinued from Canadian Solar's current production lineup and replaced by newer models, including TOPCon-based panels. Units may still be found in distributor stock or as remaining inventory, so it's worth confirming current availability with your supplier and verifying that the manufacturer's warranty is still fully honored despite the series being discontinued.
What warranty comes with KuMax panels and what does it cover?
Canadian Solar provides a 12-year product warranty covering material and workmanship defects, plus a 25-year power performance warranty. This means the manufacturer guarantees a defined level of energy output over a quarter century, which is a standard benchmark for Tier 1 panels in this class.
How do half-cut cells in KuMax differ from standard PERC panels?
The half-cut cells in KuMax are standard monocrystalline PERC cells cut in half, reducing current losses and internal resistance in the module. Combined with the multi-busbar design, this improves resistance to microcracks and partial shading, such as from chimneys or antennas, and increases overall energy yield compared to classic full-cell panels of the same power rating.
Is the 400 Wp KuMax panel suitable for installations with heavy snow and wind loads?
Yes, this is one of the key advantages of the KuMax series. The panels feature a reinforced, thicker frame specifically engineered for increased mechanical loads, making them a good choice for rooftops in mountainous regions or other areas with heavy snowfall and strong winds.
Are KuMax panels resistant to PID degradation?
Yes, KuMax modules carry certified PID (Potential Induced Degradation) resistance, addressing power loss caused by voltage potential differences within an array. This keeps electrical parameters stable throughout the panel's service life, even in large installations with high system voltages.
Is it worth buying KuMax panels for commercial or utility-scale projects despite the end of production?
KuMax panels remain a solid choice for commercial projects thanks to predictable LCOE, 100% EL testing of every unit, and Canadian Solar's reputation as a Tier 1 manufacturer. When purchasing remaining stock, however, it's important to confirm batch consistency in production date and specifications, since new units of this series are no longer being manufactured.
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