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VSUN Brand review

VSUN665-132BMH-DG

665 Wp PERC Bifacial 70%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 1,136 of 14,005
Compare panels Datasheet PDF
Power (Wp)
665
Typical for its class
Efficiency (%)
21.41
Typical · median 21.25%
Density (Wp/m²)
214.1
Typical · median 212.5
Temp (%/°C)
-0.340
Typical · median -0.340
Weight (kg)
38.5
Weak · 4.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The VSUN 132BMH-DG series are bifacial modules with a double-glass construction, designed to maximize energy yield in installations where every square meter counts. Due to their bifacial operation, these panels can utilize reflected light from the ground, significantly improving energy production in ground-mounted, flat-roof, and elevated installations. A key advantage is the dual-glass construction, which enhances rigidity, resistance to micro-cracks, and long-term stability. The use of half-cut cells reduces resistance losses and improves performance under partial shading, which is a common issue on roofs with obstructions. Another advantage of this series is the bifacial technology, which provides additional yield without requiring any further installation modifications. In practice, this is a good choice for investors who expect higher production under diffuse light conditions and want to minimize the risk of performance degradation over time. This series is suitable for both modern prosumer installations and commercial projects focused on profitability.

Ranking

320 panels in the segment PERC 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.41% 21.25% Typical 8,280
Power density 214.1 212.5 Typical 8,250
Temperature coefficient -0.340 -0.340 Typical 8,778
Weight per kWp 57.9 52.3 Weak · bottom 24% 11,470
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 · 1 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Weight-limited structures.

Watch-outs
57.9 kg per kWp

Bottom 24% of the PERC 650-700 W segment, against a median of 52.3.

Notes from the database
  • At 21.4% efficiency, this panel is on par with typical PERC 650-700W modules
  • At 214.1 W/m² power density, roof space requirements are typical for PERC 650-700W panels
  • At -0.34%/°C, hot weather performance is typical for PERC 650-700W panels
  • At 38.5 kg, this panel is 4.0 kg heavier than the PERC 650-700W median (34.5 kg) - more demanding for installation crews
  • Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 665 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.41 % Typical Segment median 21.25%
Vmpp · Impp 37.79 V · 17.60 A Operating point at max power
Voc · Isc 45.46 V · 18.73 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 38.5 kg Weak Weak · 4.0 kg above median
Cells 132 · PERC Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.340 %/°C Typical median -0.340 of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°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 85.0 % Equals 565 W guaranteed
Degradation 2.00 → 0.45 % 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
-
With bifacial gain
-

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

Heat losses
-0.340 %/°C against a segment median of -0.340
-
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 VSUN665-132BMH-DG 665 W 21.41% -0.340 38.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.6 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.6 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +3.6 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +3.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.4 pp
CSUN645-132M 645 W 20.76% -0.350 34.5 kg Lighter, -0.6 pp, -5 yr warranty
VSUN655-132BMH-DG 655 W 21.09% -0.340 38.5 kg -10 W, -0.3 pp
VSUN660-132BMH-DG 660 W 21.25% -0.340 38.5 kg Very close match
VSUN670-132BMH-DG 670 W 21.57% -0.340 38.5 kg Very close match
VSUN685N-132BMH-DG 685 W 22.05% -0.300 38.5 kg +20 W, cooler, +0.6 pp
VSUN690N-132BMHT-DG 690 W 22.21% -0.300 38.5 kg +25 W, cooler, +0.8 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +135 W, cooler, +3.5 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +130 W, cooler, +3.4 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the VSUN 132BMH-DG panel series still available for purchase?
The VSUN 132BMH-DG series, including the up-to-670 Wp variant, has been discontinued by VSUN and is no longer part of the manufacturer's current lineup. Availability is now limited to remaining distributor stock. If you're expanding an existing installation with the same panels, check stock levels in advance, since once supplies run out an identical model will no longer be orderable.
How much extra energy does bifacial technology add on VSUN 132BMH-DG panels?
Thanks to their two-sided design, these panels capture light reflected off the ground, typically adding a yield gain of roughly a few percent up to the low teens compared to a monofacial module of the same front-side rating, depending on conditions such as bright roofing, gravel, or snow. The actual gain depends on mounting height above the ground, surface albedo, and tilt angle, so the best results come from ground-mount arrays and elevated racking systems.
How does the double-glass design differ from a standard glass-backsheet panel?
In the double-glass construction, the rear backsheet layer is replaced with a second tempered glass sheet, increasing module rigidity, improving resistance to cell microcracks, and reducing long-term degradation, including PID effects. This design is also a technical requirement for bifacial operation, since it lets light pass through from the rear. The trade-off is a somewhat higher module weight compared to a backsheet version.
How do half-cut cells affect performance under partial shading?
Half-cut cells split the module into smaller electrical sections, so shading part of the panel, for example from a chimney, antenna, or leaves, causes a smaller drop in total output than with a full-cell design. Lower currents in each circuit also reduce resistive losses and slightly lower cell operating temperature, resulting in higher real-world efficiency under everyday shading conditions.
What warranty comes with VSUN 132BMH-DG panels?
The manufacturer backs the series with a 25-year product warranty and a 30-year linear power output warranty, covering material and manufacturing defects as well as a guaranteed minimum energy output over the panel's lifetime. Since this model has been discontinued, warranty service may involve replacement with a comparable model if an identical panel is no longer available.
Is PERC cell technology in the VSUN 132BMH-DG series outdated compared to TOPCon?
PERC is a proven, stable cell technology that VSUN used for the 132BMH-DG series, delivering up to 670 Wp at a typical efficiency around 21-22%. Newer TOPCon and HJT cells achieve higher efficiency and lower annual degradation, which is one reason manufacturers have been phasing out PERC lines and why this series was discontinued. For existing installations, PERC remains a fully functional and efficient solution throughout the warranty period.
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