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VSUN Brand review

VSUN420N-108MH-BW

420 Wp TOPCon
ComparePV verdict

Middle of its segment, needs the roof space

Rank 8,532 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)
21.4
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The VSUN N-108MH-BW panel series is based on advanced N-type cells, which represents a significant technological leap compared to traditional P-type modules. The use of TOPCon technology allows for much higher energy conversion efficiency, especially in lower sunlight conditions. The innovative design with 108 half-cut cells minimizes energy losses resulting from internal resistance and partial shading of the module. N-Type TOPCon technology provides users with a significantly slower decline in efficiency over time, which translates into measurable financial gains over many years. This solution is ideal for investors looking for a balance between modern aesthetics and high efficiency on limited roof space. Thanks to low temperature coefficients, these modules work more efficiently on hot days, which clearly distinguishes them from older market solutions. High resistance to LID and LeTID degradation guarantees long-term parameter stability, eliminating the risk of premature component wear. Half-cut cell construction further increases safety by limiting the risk of hot-spots. This model is dedicated to modern prosumer installations, where maximizing yields from the roof area and the guarantee of many years of trouble-free operation of the entire photovoltaic system are key.

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 51.0 51.4 Typical 4,321
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

Residential, shaded-installations and hot-climate.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
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
  • At 215.1 W/m², this panel generates 5.1 W/m² less per unit area than TOPCon 400-450W median (220.2 W/m²)
  • At -0.30%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • In the top 56% for efficiency among all TOPCon panels

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 21.4 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
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 (30-year Linear Power Warranty) Warranty (30-year Linear Power Warranty) Whole series I-V Curves – Temperature Dependence (AM1.5, 1000W/m²) I-V Curves – Temperature Dependence (AM1.5, 1000W/m²) Whole series I-V Curves – Irradiance Dependence (25°C) – Excellent performance under weak light condition. I-V Curves – Irradiance Dependence (25°C) – Excellent performance under weak light condition. 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
-

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
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
VSUN VSUN420N-108MH-BW 420 W 21.51% -0.300 21.4 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, +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, cooler, +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, heavier, -1.5 pp
VSUN395-108BMH-DG 395 W 20.23% -0.320 24.7 kg -25 W, heavier, -1.3 pp
VSUN400-108BMH-DG 400 W 20.48% -0.320 24.7 kg Hotter, heavier, -1.0 pp
VSUN405-108BMH-DG 405 W 20.74% -0.320 24.7 kg Hotter, heavier, -0.8 pp
VSUN410-108BMH 410 W 21.00% -0.320 21.4 kg -10 W, hotter, -0.5 pp
VSUN415N-108MH 415 W 21.25% -0.300 21.4 kg -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 is TOPCon technology in the VSUN N-108MH-BW panels and how does it differ from standard P-type modules?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that reduces electron recombination through an additional passivation layer. In practice, this means higher conversion efficiency (up to 22%), better performance in low-light conditions, and slower power degradation over time than traditional P-type panels. The module reaches a maximum power of 430 Wp, delivering higher real-world energy yield from the same roof area.
What are half-cut cells in the VSUN N-108MH-BW and how do they affect panel durability?
The panel uses 108 half-cut cells, physically split in two. This design reduces resistive losses and lowers the risk of hot-spots forming under partial shading, such as from a chimney or antenna. Combined with high resistance to LID and LeTID degradation, this results in more stable long-term performance throughout the installation's lifetime.
Are the VSUN N-108MH-BW panels bifacial, and do they generate power from the rear side?
No, the N-108MH-BW series is mono-facial — power is generated exclusively from the front side of the module. If you want additional energy gains from albedo reflected off the ground (e.g., a light-colored roof or gravel), consider VSUN's bifacial variants, such as the BMHS-DG-BT series, which also have an active rear side.
What warranty comes with the VSUN N-108MH-BW panels and how much power do they retain over time?
The manufacturer provides a 25-year product warranty and a 30-year linear power output warranty. According to the datasheet, the panel retains about 99% of its power after the first year and roughly 87.4% of nominal power after 30 years. This is the result of low annual degradation typical of N-type TOPCon cells, significantly better than older P-type modules.
Is the VSUN N-108MH-BW series still available for purchase?
No, production of this series has been discontinued and it has been replaced by newer TOPCon variants in VSUN's lineup, such as models with more busbars or bifacial versions. If you already have panels from this series installed, the manufacturer's warranty remains valid. For a new purchase, check with a distributor for remaining stock or the closest current equivalent.
Do the VSUN N-108MH-BW panels perform well in hot summer conditions on the roof?
Yes, these modules have a low power temperature coefficient, typical of N-type TOPCon cells, so they lose less efficiency as the roof heats up on hot days compared to traditional P-type panels. In practice, this means more stable energy yields during summer months, when panels reach their highest operating temperatures despite peak sunlight availability.
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