Skip to main content
VSUN Brand review

VSUN635N-156BMH-DG

635 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,382 of 14,005
Compare panels Datasheet PDF
Power (Wp)
635
Strong · top 16%
Efficiency (%)
22.72
Typical · median 22.80%
Density (Wp/m²)
227.2
Typical · median 227.7
Temp (%/°C)
-0.300
Weak · bottom 19%
Weight (kg)
34.9
Weak · 2.2 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The VSUN N-156BMH-DG series is an advanced solution based on N-type TOPCon cell technology, which redefines efficiency standards in large commercial installations and photovoltaic farms. The use of this architecture allows for the effective elimination of the light-induced degradation problem, translating into stable energy production for decades. A key advantage is the bifacial Double Glass design, which enables the absorption of radiation reflected from the ground, significantly increasing the total energy yield compared to single-sided modules. Thanks to the use of large-area cells and precise interconnection, these panels optimize power density per square meter, which directly reduces the costs of mounting structures and cabling. A low temperature coefficient ensures that the modules maintain high efficiency even on hot days, solving the problem of power drops in full sun. This product is designed for investors seeking the lowest LCOE and maximum durability. A standout feature among competitors is its exceptional resistance to extreme weather conditions and high mechanical load capacity, guaranteeing investment security in the demanding Polish climate.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.72% 22.80% Typical 3,245
Power density 227.2 227.7 Typical 3,252
Temperature coefficient -0.300 -0.290 Weak · bottom 19% 6,093
Weight per kWp 55.0 53.1 Weak · bottom 17% 9,356
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 2 caution
Best for

Utility-scale, commercial and hot-climate.

Not ideal for

Weight-limited structures and hot climates.

Watch-outs
55.0 kg per kWp

Bottom 17% of the TOPCon 600-650 W segment, against a median of 53.1.

-0.300 %/°C temperature coefficient

Bottom 19% of the TOPCon 600-650 W segment, against a median of -0.290.

Notes from the database
  • At 22.7% efficiency, this panel is on par with typical TOPCon 600-650W modules
  • At 227.2 W/m² power density, roof space requirements are typical for TOPCon 600-650W panels
  • Temperature coefficient of -0.30%/°C matches the TOPCon 600-650W median
  • At 34.9 kg, this panel is 2.2 kg heavier than the TOPCon 600-650W median (32.7 kg) - more demanding for installation crews
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 635 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.72 % Typical Segment median 22.80%
Vmpp · Impp 46.39 V · 13.69 A Operating point at max power
Voc · Isc 56.00 V · 14.40 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×35 mm · 2.80 m² of roof
Weight 34.9 kg Weak Weak · 2.2 kg above median
Cells 156 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Weak bottom 19% of its segment
Coefficient Voc · Isc -0.260 · 0.046 %/°C
NOCT 45 °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 555 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by VSUN in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 635 Wp appear here. The rest cover the whole series.

30-Year Linear Power Warranty 30-Year Linear Power Warranty Whole series I-V Curves at Various Irradiance Levels (25°C) I-V Curves at Various Irradiance Levels (25°C) Whole series

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
-0.300 %/°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
VSUN VSUN635N-156BMH-DG 635 W 22.72% -0.300 34.9 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +2.5 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +45 W, lighter, +2.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +40 W, lighter, +2.3 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +2.3 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +2.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +2.1 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +2.1 pp
VSUN610N-156BMH-DG 610 W 21.82% -0.300 34.9 kg -25 W, -0.9 pp
VSUN615N-156BMH-DG 615 W 22.00% -0.300 34.9 kg -20 W, -0.7 pp
VSUN620N-156BMH-DG 620 W 22.18% -0.300 34.9 kg -15 W, -0.5 pp
VSUN625N-156BMH-DG 625 W 22.36% -0.300 34.9 kg -10 W, -0.4 pp
VSUN630N-156BMH-DG 630 W 22.54% -0.300 34.9 kg Very close match
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +65 W, cooler, +2.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +60 W, cooler, +2.2 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +35 W, cooler, +2.1 pp

Found 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1813 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is N-type TOPCon cell technology used in the VSUN N-156BMH-DG panels, and how does it differ from popular P-type PERC?
TOPCon (Tunnel Oxide Passivated Contact) is the N-type cell technology used in the VSUN N-156BMH-DG series, delivering higher module efficiency (up to 22.72%) than older P-type PERC cells. An additional tunnel oxide layer reduces recombination losses and virtually eliminates light-induced degradation (LID), resulting in more stable energy output throughout the system's lifetime.
How much extra energy do the bifacial VSUN N-156BMH-DG panels produce compared to standard monofacial modules?
Thanks to the Double Glass design, VSUN N-156BMH-DG panels capture reflected light on the rear side of the cell. With a bifacial factor of around 80%, this can boost total energy yield by up to double-digit percentages, especially over high-albedo surfaces like gravel, white roofing, or snow. The actual gain depends on mounting height, ground albedo, and tilt angle.
What warranty comes with VSUN N-156BMH-DG solar panels?
The manufacturer backs the VSUN N-156BMH-DG series with a 12-year product warranty and a 30-year linear power output warranty, guaranteeing at least 87.4% of original power after 30 years. This is a standard benchmark for modern TOPCon panels, giving investors confidence in a stable return over a three-decade horizon.
Are the 635 Wp VSUN N-156BMH-DG panels suitable for residential rooftops, or are they mainly built for large PV farms?
Given their large footprint (2465×1134 mm) and weight of nearly 35 kg, VSUN N-156BMH-DG panels are primarily designed for commercial installations and utility-scale solar farms, where maximizing power density per square meter matters most. Installation on single-family home roofs is possible but requires a sturdy mounting structure and adequate installation equipment due to the module's size.
How do VSUN N-156BMH-DG panels perform in high summer heat?
VSUN N-156BMH-DG modules have a low power temperature coefficient of -0.3%/°C, lower than typical PERC cells (usually around -0.35 to -0.4%/°C). This means smaller power losses during heat waves, when panel temperature can exceed 60°C, translating into higher real-world energy production in summer compared to older cell technologies.
Is VSUN a Tier 1 solar panel manufacturer, and is the brand worth choosing?
VSUN does not currently appear on the BloombergNEF Tier 1 manufacturer list, but the company is headquartered in Germany and offers panels built on proven N-type TOPCon technology backed by a 30-year power warranty. Tier 1 status mainly reflects financial standing and production scale, not necessarily module quality, so it's worth checking certifications and warranty terms as well.
Add to compare