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Yingli YL660DF66 f/2
Yingli Brand review

YL660DF66 f/2

660 Wp PERC Bifacial 70%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 3,281 of 14,129
Compare panels Datasheet PDF
Power (Wp)
660
Typical for its class
Efficiency (%)
21.20
Typical · median 21.25%
Density (Wp/m²)
212.5
Typical · median 212.5
Temp (%/°C)
-0.340
Typical · median -0.340
Weight (kg)
38.4
Weak · 3.9 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Yingli YLM 3.0 Plus 1 series is designed for high energy production on limited mounting surfaces, making it ideal where every square meter of roof or field space counts. These modules utilize p-type monocrystalline PERC solar cells, and their refined interconnection architecture ensures stable performance even under partial shading and uneven irradiance, common in many Polish installations. A key feature is the glass-glass construction, which enhances environmental resistance and facilitates maintaining parameters over a long period - a real advantage in projects exposed to wind, humidity, and temperature fluctuations. The series targets high reliability in challenging conditions thanks to high-quality lamination materials and robust construction. The YLM 3.0 Plus 1 is a solid choice for commercial and utility-scale PV projects, where dependable power generation and long-term durability take precedence over catalog specifications.

Ranking

320 panels in the segment PERC 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.20% 21.25% Typical 9,145
Power density 212.5 212.5 Typical 9,028
Temperature coefficient -0.340 -0.340 Typical 8,846
Weight per kWp 58.2 52.3 Weak · bottom 20% 11,682
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 and utility-scale.

Not ideal for

Weight-limited structures.

Watch-outs
58.2 kg per kWp

Bottom 20% of the PERC 650-700 W segment, against a median of 52.3.

Notes from the database
  • At 21.2% efficiency, this panel is on par with typical PERC 650-700W modules
  • Power density of 212.5 W/m² matches the PERC 650-700W median
  • Temperature coefficient of -0.34%/°C matches the PERC 650-700W median
  • At 38.4 kg (3.9 kg above PERC 650-700W median of 34.5 kg), requires checking roof load capacity
  • Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.20 % Typical Segment median 21.25%
Vmpp · Impp 37.90 V · 17.42 A Operating point at max power
Voc · Isc 45.70 V · 18.48 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 38.4 kg Weak Weak · 3.9 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 43 °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 85.0 % Equals 561 W guaranteed
Degradation 2.00 → 0.45 % 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 660 Wp appear here. The rest cover the 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
-0.340 %/°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
Yingli YL660DF66 f/2 660 W 21.20% -0.340 38.4 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +4.0 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +4.0 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +40 W, cooler, +3.8 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg Cooler, lighter, +3.8 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +3.7 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.6 pp
YL645DF66 f/2 645 W 20.80% -0.340 38.4 kg -15 W, -0.4 pp
YL650DF66 f/2 650 W 20.90% -0.340 38.4 kg -10 W, -0.3 pp
YL655DF66 f/2 655 W 21.10% -0.340 38.4 kg Very close match
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +145 W, cooler, +3.9 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +135 W, cooler, +3.6 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +130 W, cooler, +3.4 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +100 W, cooler, +3.3 pp

Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here

About the YLM 3.0 Plus 1 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 YLM 3.0 Plus 1 panel?
The top variant of the YLM 3.0 Plus 1 series reaches up to 670 Wp, thanks to 132 large p-type monocrystalline PERC cells. This allows high energy yield from fewer modules, which meaningfully reduces installation time and mounting structure costs in commercial installations and utility-scale PV farms.
How does the glass-glass construction of the YLM 3.0 Plus 1 differ from standard glass-backsheet panels?
Unlike typical panels with a rear backsheet layer, the YLM 3.0 Plus 1 encapsulates its cells between two glass panes. This design better protects the cells from moisture, microcracks, and PID degradation, resulting in a slower power decline over time and greater resistance to harsh weather conditions such as strong wind or hail.
What warranty comes with the Yingli YLM 3.0 Plus 1 panels?
The manufacturer offers a 12-year product warranty along with a 30-year linear power output warranty. This means that after 30 years of operation, the panel should still retain the guaranteed minimum percentage of its initial output, a standard expectation for modern glass-glass modules from a tier 1 manufacturer.
Is the YLM 3.0 Plus 1 suited for large-scale PV farms or more for residential roofs?
This series is designed primarily for commercial installations and utility-scale PV farms, where predictable energy yield and long-term durability matter more than raw datasheet figures. Its large format and high unit power (up to 670 Wp) make it better suited to large mounting areas than to a typical single-family sloped roof.
Are the YLM 3.0 Plus 1 panels bifacial, generating power from the rear side?
No, the YLM 3.0 Plus 1 series uses standard monofacial PERC cell architecture. The glass-glass construction here is meant to boost durability and environmental resistance, not add rear-side power generation - this sets it apart from bifacial models in Yingli's lineup.
Who manufactures the YLM 3.0 Plus 1 panels, and is it a reliable tier 1 supplier?
The YLM 3.0 Plus 1 panels are made by Yingli, a Chinese manufacturer with decades of industry experience, classified as a tier 1 supplier. This reflects solid financial standing and proven manufacturing capacity, which matters when pursuing warranty claims over the multi-decade lifespan of a PV installation.
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