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CSUN Brand review

CSUN400-72M

400 Wp PERC
ComparePV verdict

Middle of its segment, weak in heat

Rank 12,249 of 14,005
Compare panels Datasheet PDF
Power (Wp)
400
Weak · bottom 9%
Efficiency (%)
20.17
Weak · bottom 18%
Density (Wp/m²)
201.7
Weak · bottom 19%
Temp (%/°C)
-0.370
Weak · bottom 5%
Weight (kg)
22.1
Typical · median 22.0 kg
Warranty (yrs)
25
Typical · median 25 yrs

The Galaxy series consists of standard polycrystalline CSUN modules built on PERC technology, delivering solid conversion efficiency without the price premium of monocrystalline alternatives. It's a fit for installers and investors looking for a proven, predictable product with a strong price-to-performance ratio rather than the latest experimental cell technology. The modules stand out with a positive power tolerance, meaning each panel never underperforms the rating stated on its datasheet, which simplifies system sizing and reduces the risk of underestimated energy yield. The panels have passed rigorous salt mist and ammonia corrosion resistance testing, making them a solid choice for coastal installations as well as agricultural sites exposed to ammonia vapors. The frame and structure are certified for high wind and snow load ratings, a relevant factor for installations in more demanding climate conditions found across much of Poland. A favorable temperature coefficient keeps output more stable during hot days, while improved low-light performance boosts energy harvest on overcast days. The product is backed by a 25-year linear power output warranty reinsured by Munich Re, adding an extra layer of long-term financial security to the investment.

Ranking

954 panels in the segment PERC 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.17% 20.60% Weak · bottom 18% 12,061
Power density 201.7 206.2 Weak · bottom 19% 12,016
Temperature coefficient -0.370 -0.350 Weak · bottom 5% 13,081
Weight per kWp 55.2 53.0 Typical 9,691
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 · 6 caution
Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.370 %/°C temperature coefficient

Bottom 5% of the PERC 400-450 W segment, against a median of -0.350. Ranked 13,081st in the whole database.

20.17% module efficiency

Bottom 18% of the PERC 400-450 W segment, against a median of 20.60%.

201.7 watts per square metre

Bottom 19% of the PERC 400-450 W segment, against a median of 206.2.

What owners get
Competitive efficiency up to 20.17%

The top variant in the series (CSUN400-72M-158) reaches 20.17% efficiency, placing it near the top of the segment — on par with MWG Mono (20.12%) and clearly ahead of DMEGC GH400M10T-B48HST (15.48%), despite relying on older PERC rather than N-type cell technology.

Positive power tolerance

Panels never fall below the nameplate rated power, eliminating the risk of underestimated energy yield during system design and simplifying inverter sizing.

Salt mist and ammonia corrosion certification

Modules pass IEC 61701 (salt mist) and IEC 62716 (ammonia corrosion) testing, making them a safe choice for coastal installations and livestock farms, where standard panels degrade faster.

High wind and snow load resistance

The certified frame construction for elevated mechanical loads is practically relevant for installations in Polish regions with heavy snowfall, reducing the risk of microcracks and frame failure.

25-year linear power warranty backed by Munich Re

The 25-year linear power warranty, reinsured by Munich Re, gives investors additional financial security independent of the manufacturer's own solvency — an important factor for bank-financed projects.

Trade-offs
Wide efficiency spread down to 16.75%

The lowest-power variant in the series achieves only 16.75% efficiency — well below peer comparables like Heliene (20.5%) or MWG (20.12%). Choosing a base variant means significantly lower power density per m² of roof.

12-year product warranty below the rising standard

While the tier-1 market increasingly offers 15-year product warranties, the Galaxy series remains at 12 years, which may be less attractive to investors comparing offers for project bankability.

No bifacial variant available

The series relies exclusively on PERC technology without a bifacial option, missing the additional energy gain (typically 5-10%) from ground albedo available in competing bifacial modules.

Notes from the database
  • Efficiency of 20.2% matches the PERC 400-450W median
  • Power density of 201.7 W/m² is 4.5 W/m² below PERC 400-450W median (206.2 W/m²) - needs more roof space
  • Temperature coefficient of -0.37%/°C is 0.02pp worse than PERC 400-450W median (-0.35%/°C) - higher losses in summer heat
  • In the top 86% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 400 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.17 % Weak Segment median 20.60%
Vmpp · Impp 41.10 V · 9.74 A Operating point at max power
Voc · Isc 49.30 V · 10.36 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1979×1002×35 mm · 1.98 m² of roof
Weight 22.1 kg Typical Typical · median 22.0 kg
Cells 72 · PERC Monocrystalline
Coefficient Pmax -0.370 %/°C Weak bottom 5% of its segment
Coefficient Voc · Isc -0.300 · 0.060 %/°C
NOCT 45 °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
End-of-warranty output 82.6 % Equals 318 W guaranteed
Degradation 3.00 → 0.60 % 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
-

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

Heat losses
-0.370 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
CSUN CSUN400-72M 400 W 20.17% -0.370 22.1 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg Cooler, +2.9 pp, +5 yr warranty
JST-EDMH-(445-465)W-TD (450W class) 450 W 23.05% -0.300 20.5 kg +50 W, cooler, +2.9 pp
QNN182-HG450-54 450 W 23.04% -0.290 24.0 kg +50 W, cooler, +2.9 pp
HY440-N108BDD 450 W 23.04% -0.300 23.5 kg +50 W, cooler, +2.9 pp
NLBK-27-450 450 W 23.04% -0.300 22.9 kg +50 W, cooler, +2.9 pp
RS41-450NBG-E3 450 W 23.04% -0.290 24.5 kg +50 W, cooler, +2.9 pp
CSUN375-72M 375 W 18.91% -0.370 22.1 kg -25 W, -1.3 pp
CSUN380-72M 380 W 19.16% -0.370 22.1 kg -20 W, -1.0 pp
CSUN385-72M 385 W 19.42% -0.370 22.1 kg -15 W, -0.8 pp
CSUN390-72M 390 W 19.67% -0.370 22.1 kg -10 W, -0.5 pp
CSUN395-72M 395 W 19.92% -0.370 22.1 kg -0.2 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Cooler, +3.8 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +3.5 pp, +15 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg Cooler, +3.3 pp, +15 yr warranty
LEPV 132 ULTRA PREMIUM BLACK 440Wp (LEPV 440) 440 W 22.37% -0.290 21.0 kg Cooler, +2.2 pp, +5 yr warranty
NS-420MH-80 420 W 22.28% -0.290 20.0 kg Cooler, lighter, +2.1 pp

Found 86 panels of the same or similar size to this one, within ±10 mm. See them here Found 304 panels of the same or similar size to this one, within ±25 mm. See them here Found 439 panels of the same or similar size to this one, within ±50 mm. See them here Found 566 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the maximum power output of the CSUN Galaxy Series panel?
Panels in the Galaxy Series reach a maximum power output of up to 400 Wp. Thanks to PERC technology and positive power tolerance, the panel practically never generates less energy than its rated value, making it easier to accurately design a system and predict annual energy yields.
How does the PERC technology in the CSUN Galaxy Series differ from standard polycrystalline cells?
PERC technology adds a passivation layer to the back of the cell, reflecting unused light back into the silicon structure and increasing conversion efficiency. In the Galaxy Series, this delivers efficiency close to more expensive monocrystalline modules while keeping the lower price typical of polycrystalline technology.
What warranty comes with CSUN Galaxy Series panels?
The manufacturer provides a 12-year product warranty and a 25-year linear power warranty. The power warranty is additionally backed by Munich Re reinsurance, meaning the payout is guaranteed even if the manufacturer faces financial difficulties, giving investors real security over the entire lifespan of the installation.
Are CSUN Galaxy Series panels suitable for farms or coastal installations?
Yes, the modules have passed rigorous salt mist and ammonia corrosion resistance testing, making them a good choice both for coastal installations exposed to salty air and for farms where ammonia fumes from livestock can accelerate corrosion of standard frames and connectors.
Can CSUN Galaxy Series withstand heavy snow loads in winter?
Yes, the module construction is certified for high wind and snow loads, which matters particularly in Poland, where a significant layer of snow can accumulate on roof surfaces during winter. The reinforced frame allows safe operation in harsher climate conditions without risk of structural damage.
Do CSUN Galaxy Series panels perform well on cloudy days and in low-light conditions?
Yes, the modules feature improved low-irradiance performance, resulting in higher energy yields on cloudy days compared to standard panels. Combined with a good temperature coefficient, this ensures more stable energy production throughout the year, regardless of time of day or weather conditions.
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