--- title: "Yingli LF660M12-66H Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli LF660M12-66H solar panel. Specs: 21.25% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/yingli-lf660m12-66h" image: "https://comparepv.com/og/panel/yingli-lf660m12-66h.png" updated: 2026-09-11 --- # Yingli LF660M12-66H Middle of its segment, weak in heat 110 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** Yingli - **Model:** LF660M12-66H - **Series:** LF670M12-66H - **Rated power:** 660 W - **Cell technology:** N-type ## How it compares Compared against segment N-type 650-700 W (110 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 660 W | Typical | | | 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 (kg) | 34.0 kg | 33.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 7% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### Watch out for - **-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. - **Best for:** Utility-scale and commercial. - **Not ideal for:** Hot climates, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 21.25 % - **Voltage at Pmax (Vmp):** 38.08 V - **Current at Pmax (Imp):** 17.33 A - **Open-circuit voltage (Voc):** 46.03 V - **Short-circuit current (Isc):** 18.46 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.354 %/degC - **Temperature coefficient of Voc:** -0.266 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 132 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 34.0 kg - **Area:** 3.11 m2 - **Power density:** 212.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8973 of 14129 | | Power density | 9028 of 14129 | | Temperature coefficient | 12365 of 14129 | | Weight | 4910 of 14129 | | Warranty | 9912 of 14129 | ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1-b0964353031e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, +3.8 pp, +5 yr warranty | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | Cooler, +3.8 pp, +5 yr warranty | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, +3.6 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.6 pp | | [Yingli YL645DF66 f/2](https://comparepv.com/panel/yingli-yl645df66-f-2) | 645 W | Heavier, -0.4 pp, +5 yr warranty | | [Yingli YL650DF66 f/2](https://comparepv.com/panel/yingli-yl650df66-f-2) | 650 W | Heavier, -0.4 pp, +5 yr warranty | | [Yingli YL655DF66 f/2](https://comparepv.com/panel/yingli-yl655df66-f-2) | 655 W | Cooler, heavier, +5 yr warranty | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +145 W, cooler, +3.9 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +140 W, cooler, +3.6 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +135 W, cooler, +3.6 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +130 W, cooler, +3.4 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +100 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/yingli-lf660m12-66h Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.