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VSUN Brand review

VSUN420N-108BMH-DG-BB

420 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 8,658 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.51
Weak · bottom 20%
Density (Wp/m²)
215.1
Weak · bottom 19%
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
24.7
Weak · 2.7 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The VSUN N-108BMH-DG-BB module series is an advanced solution based on innovative N-type TOPCon cells that redefine performance standards in variable lighting conditions. Thanks to the use of Bifacial Dual Glass construction, these panels effectively absorb reflected light hitting the rear side, significantly increasing the total annual energy yield. Choosing this series effectively solves the problem of limited roof space by offering higher power density and excellent resistance to light- and temperature-induced degradation. The aesthetic Black Frame finish makes the installation look modern, perfectly blending with dark roof coverings. The robust glass-glass construction ensures exceptional mechanical durability and resistance to aggressive weather factors, as confirmed by a 30-year performance warranty. This product is dedicated to demanding private investors and companies that focus on maximizing profits and system longevity. What sets them apart from the competition is significantly better performance in diffused light and a minimal annual power drop, which guarantees energy stability for decades. These panels are the optimal choice wherever the highest reliability must go hand-in-hand with elegance and the latest photovoltaic technology.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.51% 22.00% Weak · bottom 20% 7,894
Power density 215.1 220.2 Weak · bottom 19% 7,882
Temperature coefficient -0.300 -0.290 Typical 6,093
Weight per kWp 58.8 51.4 Weak · bottom 7% 11,908
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 · 3 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

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

Watch-outs
58.8 kg per kWp

Bottom 7% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,908th in the whole database.

215.1 watts per square metre

Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2.

21.51% module efficiency

Bottom 20% of the TOPCon 400-450 W segment, against a median of 22.00%.

Notes from the database
  • At 21.5% efficiency, this panel is on par with typical TOPCon 400-450W modules
  • Power density of 215.1 W/m² is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • At -0.30%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • At 24.7 kg, this panel is 2.7 kg heavier than the TOPCon 400-450W median (22.0 kg) - more demanding for installation crews
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.51 % Weak Segment median 22.00%
Vmpp · Impp 31.52 V · 13.32 A Operating point at max power
Voc · Isc 38.11 V · 14.07 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 24.7 kg Weak Weak · 2.7 kg above median
Cells 108 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.260 · 0.046 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 367 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 420 Wp appear here. The rest cover the whole series.

Warranty Warranty Whole series I-V and P-V Curves at Different Temperatures (AM1.5, 1000W/m²) I-V and P-V Curves at Different Temperatures (AM1.5, 1000W/m²) Whole series I-V and P-V Curves at Different Irradiance Levels (25°C) I-V and P-V Curves at Different 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 VSUN420N-108BMH-DG-BB 420 W 21.51% -0.300 24.7 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, lighter, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, lighter, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
VSUN390-108BMH-DG 390 W 19.97% -0.320 24.7 kg -30 W, hotter, -1.5 pp
VSUN395-108BMH-DG 395 W 20.23% -0.320 24.7 kg -25 W, hotter, -1.3 pp
VSUN400-108BMH-DG 400 W 20.48% -0.320 24.7 kg -20 W, hotter, -1.0 pp
VSUN405-108BMH-DG 405 W 20.74% -0.320 24.7 kg -15 W, hotter, -0.8 pp
VSUN410-108BMH 410 W 21.00% -0.320 21.4 kg Hotter, lighter, -0.5 pp
VSUN415N-108MH 415 W 21.25% -0.300 21.4 kg Lighter, -0.3 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.0 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty comes with the VSUN N-108BMH-DG-BB solar panels?
The VSUN N-108BMH-DG-BB series is backed by a 25-year product warranty and a 30-year linear power performance warranty. This means the manufacturer commits to repairing or replacing modules with manufacturing defects for 25 years, while guaranteeing a defined minimum percentage of rated power output over 30 years, ensuring stable energy yield throughout the system's lifetime.
What is N-type TOPCon technology and how does it differ from the common PERC cells?
TOPCon (Tunnel Oxide Passivated Contact) is a newer generation of N-type silicon cells that, compared to P-type PERC cells, offer higher efficiency, lower light-induced degradation (LID), and better performance at high temperatures and low-light conditions. As a result, VSUN N-108BMH-DG-BB panels deliver more consistent energy output year-round, especially during periods of lower irradiance.
Do the bifacial VSUN N-108BMH-DG-BB panels actually produce more energy?
Yes, the Bifacial Dual Glass construction allows the rear side of the panel to capture light reflected from the roof, wall, or ground surface. In practice, this delivers an additional energy gain ranging from a few percent up to double digits compared to monofacial panels, though the actual effect depends on mounting height, ground albedo, and installation tilt angle.
How much power does a single VSUN N-108BMH-DG-BB panel generate?
A panel from the VSUN N-108BMH-DG-BB series reaches a maximum power output of up to 430 Wp under standard test conditions (STC). This is a competitive figure for 108 half-cut cell TOPCon modules, enabling high power density on limited roof space, which matters most for installations with restricted mounting area.
Is VSUN a Tier 1 manufacturer, and does that matter when choosing solar panels?
VSUN does not currently appear on the Bloomberg NEF Tier 1 manufacturer list, a classification primarily tied to bank financing scale rather than product quality itself. The panels pass standard certifications (IEC, TÜV) and carry long-term warranties, so it's worth evaluating them on technical parameters and warranty terms individually rather than relying solely on Tier 1 status.
Does the Dual Glass construction of the VSUN N-108BMH-DG-BB require special mounting on a sloped roof?
No, dual-glass panels are installed on standard mounting structures used for sloped roofs, similar to panels with a standard frame and backsheet. However, note the slightly higher weight of the module due to the double glass layer, and ensure adequate rear ventilation to fully benefit from the bifacial light absorption potential.
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