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Yingli Brand review

LF660M12-66H

660 Wp N-type
ComparePV verdict

Middle of its segment, weak in heat

Rank 4,186 of 14,129
Compare panels Datasheet PDF
Power (Wp)
660
Typical for its class
Efficiency (%)
21.25
Weak · bottom 7%
Density (Wp/m²)
212.5
Weak · bottom 7%
Temp (%/°C)
-0.354
Weak · bottom 3%
Weight (kg)
34.0
Typical · median 33.5 kg
Warranty (yrs)
25
Weak · bottom 7%

Yingli LF670M12-66H modules represent the peak achievement in the field of large-format photovoltaic panels, utilizing advanced monocrystalline cells in TOPCon technology. Thanks to the use of bifaciality, these panels generate energy not only from direct radiation but also from reflected light reaching the back of the module, which significantly increases the efficiency of the entire installation. The use of N-type cell technology guarantees significantly lower light-induced degradation and better performance at high temperatures, which directly translates to a more stable energy production profile in the long term. This series solves the problem of high balance of system (BOS) costs - thanks to the powerful unit power, installation requires fewer mounting structures and cabling. Innovative multi-busbar design shortens the current flow path, which minimizes internal losses and increases cell resistance to micro-cracks. This product is primarily dedicated to large-scale photovoltaic farms and large industrial facilities, where maximizing yields per square meter is key. It stands out from the competition with its excellent temperature coefficient and high resistance to demanding weather conditions, making it one of the safest investment choices on the market. High power density makes it a future-proof solution, optimizing the profitability of renewable energy projects.

Ranking

110 panels in the segment N-type 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.25% 23.31% Weak · bottom 7% 8,973
Power density 212.5 233.2 Weak · bottom 7% 9,028
Temperature coefficient -0.354 -0.290 Weak · bottom 3% 12,365
Weight per kWp 51.5 51.0 Typical 4,910
Performance warranty 25 yrs 30 yrs Weak · bottom 7% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Utility-scale and commercial.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.354 %/°C temperature coefficient

Bottom 3% of the N-type 650-700 W segment, against a median of -0.290. Ranked 12,365th in the whole database.

21.25% module efficiency

Bottom 7% of the N-type 650-700 W segment, against a median of 23.31%. Ranked 8,973rd in the whole database.

212.5 watts per square metre

Bottom 7% of the N-type 650-700 W segment, against a median of 233.2. Ranked 9,028th in the whole database.

Notes from the database
  • Efficiency of 21.2% is 2.1pp below the N-type 650-700W median (23.3%)
  • At 212.5 W/m², this panel generates 20.7 W/m² less per unit area than N-type 650-700W median (233.2 W/m²)
  • Temperature coefficient of -0.35%/°C is 0.06pp worse than N-type 650-700W median (-0.29%/°C) - higher losses in summer heat
  • In the top 64% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.25 % Weak Segment median 23.31%
Vmpp · Impp 38.08 V · 17.33 A Operating point at max power
Voc · Isc 46.03 V · 18.46 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 34.0 kg Typical Typical · median 33.5 kg
Cells 132 · N-type Monocrystalline
Coefficient Pmax -0.354 %/°C Weak bottom 3% of its segment
Coefficient Voc · Isc -0.266 · 0.046 %/°C
NOCT 43 °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 542 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
-0.354 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Yingli LF660M12-66H 660 W 21.25% -0.354 34.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.9 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.9 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 Cooler, +3.8 pp, +5 yr warranty
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg Cooler, +3.8 pp, +5 yr warranty
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, +3.6 pp, +5 yr warranty
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 Heavier, -0.4 pp, +5 yr warranty
YL650DF66 f/2 650 W 20.90% -0.340 38.4 kg Heavier, -0.4 pp, +5 yr warranty
YL655DF66 f/2 655 W 21.10% -0.340 38.4 kg Cooler, heavier, +5 yr warranty
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, +3.6 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, +3.2 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 LF670M12-66H 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 Yingli LF670M12-66H panels and what installations are they suited for?
The LF670M12-66H modules reach a maximum power of 670 Wp, making them one of the more powerful options in the large-format panel segment. Due to their large size and high power density, they are dedicated primarily to utility-scale solar farms and large industrial or commercial installations, where maximizing energy yield per square meter of roof or land is critical.
How does the N-type TOPCon cell technology in the LF670M12-66H differ from conventional P-type cells?
The N-type TOPCon cells used in the LF670M12-66H offer lower light-induced degradation (LID) and better performance at high temperatures than conventional P-type cells. This results in higher and more stable energy production throughout the panel's lifetime, translating into a better long-term return on investment.
What warranty comes with Yingli LF670M12-66H panels?
The manufacturer provides a 12-year product warranty and a 25-year power performance warranty. This means that for a quarter of a century, the panel is guaranteed to generate power in line with the manufacturer's defined degradation curve, a standard for premium N-type modules today.
Are LF670M12-66H panels bifacial modules?
No, the LF670M12-66H series is a monofacial module, generating power only from its front surface. The high 670 Wp output is achieved through large module dimensions, a multi-busbar cell design, and advanced N-type cell technology, not through dual-side energy generation.
Is Yingli a Tier 1 manufacturer, and can it be trusted for a large-scale investment?
Yes, Yingli is classified as a Tier 1 manufacturer, headquartered in China with a long-standing presence in the global PV market. Tier 1 status reflects financial stability, high production volumes, and a proven track record of module deliveries without financial default, an important criterion for financing and bankability of utility-scale projects.
How does the high unit power of the LF670M12-66H panel affect Balance of System (BOS) costs?
With 670 Wp per module, fewer panels are needed to reach the same total system power compared to lower-power models. This results in fewer mounting structures, shorter cabling runs, and faster installation, which directly reduces BOS (Balance of System) costs and shortens completion time for large-scale farm projects.
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