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Yingli YL640CF66 i/2
Yingli Brand review

YL640CF66 i/2

640 Wp TOPCon Bifacial 80%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,541 of 14,129
Compare panels Datasheet PDF
Power (Wp)
640
Strong · top 9%
Efficiency (%)
23.70
Strong · top 4%
Density (Wp/m²)
236.9
Strong · top 4%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
32.0
Strong · top 20%
Warranty (yrs)
30
Typical · median 30 yrs

The Yingli PANDA 3.0 Pro 2 series are monocrystalline n-type solar modules based on TOPCon technology, designed for high energy yield not only under ideal conditions but also in low irradiance and demanding climates. The applied surface passivation and tunnel contact architecture minimize recombination losses, resulting in more stable performance over time and better efficiency at higher temperatures. This is an excellent choice for investors seeking to genuinely increase energy output from the same roof or ground area while simultaneously reducing the risk of power degradation over the years. Dual-sided variants support rear side yield, which is particularly relevant for light-colored roofs, rooftop installations, and carports. The series also stands out for its high reliability in installations exposed to environmental stress, making it suitable for both residential and commercial/industrial distributed PV systems.

Ranking

1,085 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.70% 22.80% Strong · top 4% 549
Power density 236.9 227.7 Strong · top 4% 553
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 50.0 53.1 Strong · top 20% 3,329
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

3 positive · 0 caution
Best for

Residential, commercial, utility-scale, cold-climate and shaded-installations.

Strengths
23.70% module efficiency

Top 4% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 549th in the whole database.

236.9 watts per square metre

Top 4% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 553rd in the whole database.

50.0 kg per kWp

Top 20% of the TOPCon 600-650 W segment, against a median of 53.1.

Notes from the database
  • At 23.7% efficiency, this panel is 0.9pp above typical TOPCon 600-650W modules (median: 22.8%)
  • At 236.9 W/m² power density, this panel generates 9.2 W/m² more per unit area than TOPCon 600-650W median (227.7 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 600-650W panels
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • #549 for efficiency, #2220 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 640 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.70 % Strong Segment median 22.80%
Vmpp · Impp 41.80 V · 15.31 A Operating point at max power
Voc · Isc 49.80 V · 16.32 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.0 kg Strong Strong · top 20%
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.240 · 0.042 %/°C
NOCT 42 °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 559 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Yingli in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 640 Wp appear here. The rest cover the whole series.

PANDA Linear Warranty (power degradation over 30 years) PANDA Linear Warranty (power degradation over 30 years) Whole series I-V / P-V Curves I-V / P-V Curves 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
-0.290 %/°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
Yingli YL640CF66 i/2 640 W 23.70% -0.290 32.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +1.5 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +40 W, lighter, +1.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +35 W, lighter, +1.3 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.3 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +35 W, cooler, +1.3 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +30 W, lighter, +1.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +30 W, lighter, +1.1 pp
LF610M10N-66H/BF 610 W 22.60% -0.290 32.5 kg -30 W, -1.1 pp
LF615M10N-66H/BF 615 W 22.80% -0.290 32.5 kg -25 W, -0.9 pp
YL620CF66 i/2 620 W 23.00% -0.290 32.0 kg -20 W, -0.7 pp
YL625CF66 i/2 625 W 23.10% -0.290 32.0 kg -15 W, -0.6 pp
YL630CF66 i/2 630 W 23.30% -0.290 32.0 kg -10 W, -0.4 pp
YL635CF66 i/2 635 W 23.50% -0.290 32.0 kg Very close match
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +60 W, cooler, +1.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +55 W, cooler, +1.2 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +30 W, cooler, +1.1 pp

Found 1144 panels of the same or similar size to this one, within ±10 mm. See them here Found 1150 panels of the same or similar size to this one, within ±25 mm. See them here Found 1261 panels of the same or similar size to this one, within ±50 mm. See them here Found 1942 panels of the same or similar size to this one, within ±100 mm. See them here

About the PANDA 3.0 Pro 2 series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the maximum power output of the Yingli PANDA 3.0 Pro 2 panel?
The top models in the PANDA 3.0 Pro 2 series reach up to 645 Wp rated power. This is achieved through a 132-cell design based on large n-type monocrystalline cells with TOPCon technology, which deliver higher energy output from the same surface area than older PERC panels of similar size thanks to lower recombination losses.
How does the TOPCon technology in the PANDA 3.0 Pro 2 differ from standard PERC panels?
TOPCon uses an additional passivation layer and tunnel contact architecture that significantly reduces electron recombination losses. In practice, this means higher efficiency, a smaller power drop at high temperatures, and more stable energy production over time compared to conventional p-type PERC cells.
Is the bifacial version of the PANDA 3.0 Pro 2 worth it for a residential roof?
The bifacial variant performs best on light-colored, reflective roof surfaces, ground-mounted structures, and carports, where the rear side captures additional reflected light. On dark sloped roofs with low clearance, the extra rear-side yield will be smaller, but the panel still functions correctly as a high-power monofacial-equivalent module.
What warranty comes with the Yingli PANDA 3.0 Pro 2 panels?
The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. Yingli is a Tier 1 manufacturer headquartered in China, which supports financial stability and a realistic service path for warranty claims over this long period.
Do PANDA 3.0 Pro 2 panels perform well in hot climates?
Yes, this is one of the key strengths of the TOPCon technology used in this series. Thanks to surface passivation, the panels lose less power as cell temperature rises compared to conventional PERC modules, which matters on poorly ventilated roofs or in regions with high summer temperatures where standard panels lose noticeable efficiency.
Is the Yingli PANDA 3.0 Pro 2 series better suited for residential or commercial use?
The series is versatile: the high single-module power output (up to 645 Wp) and good performance under low irradiance make it suitable for residential rooftop installations as well as larger commercial systems or solar farms, where maximizing energy yield from limited space and reliability under environmental stress are priorities.
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