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VSUN Brand review

CSUN665-132M

665 Wp Monocrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 3,784 of 14,005
Compare panels Datasheet PDF
Power (Wp)
665
Strong · top 23%
Efficiency (%)
21.41
Weak · bottom 15%
Density (Wp/m²)
214.1
Weak · bottom 15%
Temp (%/°C)
-0.350
Weak · bottom 4%
Weight (kg)
34.5
Typical · median 33.0 kg
Warranty (yrs)
25
Weak · bottom 7%

The VSUN Mars Series consists of modules designed for high energy production in real-world Polish installations, even when the roof is not perfectly sunlit throughout the day. The use of N-type TOPCon cells helps to minimize typical losses and degradation over time, resulting in more stable operation of the installation for years. In practice, this means fewer disappointments after a few seasons and better predictability of energy yields.

The half-cut technology also deserves attention, as it makes the module more efficient under partial shading and reduces the risk of power drops across the entire panel. Furthermore, multibusbar (MBB) improves current collection from the cells and supports higher efficiency without increasing the surface area. You will also find dual-glass and bifacial construction in many variants, which increases mechanical strength and allows for the utilization of light reflected from the ground.

This is a good choice for roofs of houses, carports, and commercial installations, where durability, resistance to shading, and long-term profitability are important.

Ranking

4,929 panels in the 565-765 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.41% 22.58% Weak · bottom 15% 8,280
Power density 214.1 225.8 Weak · bottom 15% 8,250
Temperature coefficient -0.350 -0.290 Weak · bottom 4% 10,419
Weight per kWp 51.9 53.1 Typical 5,294
Performance warranty 25 yrs 30 yrs Weak · bottom 7% 9,798
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

Hot climates, owners who want a long output guarantee and roofs where every square metre has to count.

Watch-outs
-0.350 %/°C temperature coefficient

Bottom 4% of the 565-765 W band, against a median of -0.290. Ranked 10,419th in the whole database.

25 year performance warranty

Bottom 7% of the 565-765 W band, against a median of 30 yrs. Ranked 9,798th in the whole database.

214.1 watts per square metre

Bottom 15% of the 565-765 W band, against a median of 225.8.

Notes from the database
  • At 21.4% efficiency, this panel is on par with typical database modules
  • At 214.1 W/m², this panel generates 4.0 W/m² less per unit area than database median (218.1 W/m²)
  • At -0.35%/°C, loses 0.05pp more power per degree than database median (-0.30%/°C)
  • At 34.5 kg, this panel is 8.0 kg heavier than the database median (26.5 kg) - more demanding for installation crews
  • #8280 for efficiency, #10419 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 665 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.41 % Weak Segment median 22.58%
Vmpp · Impp 37.98 V · 17.51 A Operating point at max power
Voc · Isc 45.84 V · 18.55 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 34.5 kg Typical Typical · median 33.0 kg
Cells 132 Monocrystalline
Coefficient Pmax -0.350 %/°C Weak bottom 4% of its segment
Coefficient Voc · Isc -0.280 · 0.048 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 25 years Weak bottom 7% · median 30 yrs
End-of-warranty output 84.8 % Equals 546 W guaranteed
Degradation 2.00 → 0.55 % 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
-0.350 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
VSUN CSUN665-132M 665 W 21.41% -0.350 34.5 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, +3.6 pp, +5 yr warranty
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, +3.5 pp, +5 yr warranty
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 -20 W, -0.6 pp
VSUN655-132BMH-DG 655 W 21.09% -0.340 38.5 kg Heavier, -0.3 pp, +5 yr warranty
VSUN660-132BMH-DG 660 W 21.25% -0.340 38.5 kg Heavier, +5 yr warranty
VSUN670-132BMH-DG 670 W 21.57% -0.340 38.5 kg Heavier, +5 yr warranty
VSUN685N-132BMH-DG 685 W 22.05% -0.300 38.5 kg Cooler, heavier, +5 yr warranty
VSUN690N-132BMHT-DG 690 W 22.21% -0.300 38.5 kg Cooler, +0.8 pp, +5 yr warranty
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
What is the maximum power output of VSUN Mars Series panels and how many are needed for a typical installation?
VSUN Mars Series panels reach up to 665 Wp. Thanks to this high per-module output, a 10 kWp installation requires only around 15 panels, saving roof space and reducing the number of mounts, cabling, and installation time compared to older, lower-power modules.
What warranty comes with VSUN Mars Series panels?
VSUN Mars Series comes with a 12-year product warranty covering material and workmanship defects, plus a 25-year linear power warranty. This means that even after a quarter century of operation, the panel should still deliver a significant share of its rated power, supporting predictable long-term returns on investment.
What is N-type TOPCon technology in VSUN Mars Series panels, and is it worth the extra cost?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that reduces surface electron recombination, resulting in higher efficiency and lower power degradation over time compared to older P-type PERC cells. In practice, this means higher energy yields throughout the panel's lifespan, so the premium for TOPCon typically pays off within several years.
Do VSUN Mars Series panels handle partial shading well, for example from a chimney or antenna?
Yes, the modules use half-cut cell technology, splitting each cell into two halves. This means shade falling on one part of the panel doesn't disable the whole circuit, only reducing output in the shaded section. A roof with a dormer, chimney, or satellite dish won't drastically cut the entire system's efficiency the way it would with older panels lacking this technology.
Are VSUN Mars Series panels bifacial (double-sided)?
This particular variant of the VSUN Mars Series is a monofacial panel, designed for standard mounting on a pitched roof. VSUN does offer dual-glass bifacial variants within the same product line, which additionally capture light reflected off the ground - worth checking if rear-side energy generation is important for your setup.
Is VSUN a Tier 1 manufacturer, and where are Mars Series panels made?
VSUN is not currently listed as a Tier 1 manufacturer under the Bloomberg NEF classification, although the company is headquartered in Germany and has operated in the European market for years. Lacking Tier 1 status mainly reflects a company's project financing scale, not the technical quality or durability of the modules themselves.
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