--- title: "Yingli LF640M10N-66H/BF Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli LF640M10N-66H/BF solar panel. Specs: 23.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/yingli-lf640m10n-66h-bf" image: "https://comparepv.com/og/panel/yingli-lf640m10n-66h-bf.png" updated: 2026-09-11 --- # Yingli LF640M10N-66H/BF Efficiency leader, no clear weak spot 368 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Yingli - **Model:** LF640M10N-66H/BF - **Series:** LF650M10N-66H/BF - **Rated power:** 640 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (368 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 625 W | Strong - top 11% | | | Module efficiency | 23.70% | 22.77% | Strong - top 6% | 549 | | Power density | 236.9 | 227.7 | Strong - top 7% | 553 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 32.5 kg | 32.8 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.70% | 22.77% | Strong - top 6% | 549 | | Power density | 236.9 | 227.7 | Strong - top 7% | 553 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 50.8 | 52.8 | Typical | 4,218 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.70% module efficiency** - Top 6% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 549th in the whole database. - **236.9 watts per square metre** - Top 7% of the N-type 600-650 W segment, against a median of 227.7. Ranked 553rd in the whole database. - **Best for:** Small roofs that need every watt and roofs where every square metre counts. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 23.70 % - **Voltage at Pmax (Vmp):** 41.67 V - **Current at Pmax (Imp):** 15.36 A - **Open-circuit voltage (Voc):** 50.14 V - **Short-circuit current (Isc):** 16.28 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 20.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.70 m2 - **Power density:** 236.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 549 of 14129 | | Power density | 553 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 4218 of 14129 | | Warranty | 21 of 14129 | ## About this series The Yingli LF650M10N-66H/BF series redefines performance standards through the use of **N-type TOPCon** cells, which minimize energy losses and offer significantly better resistance to the LID phenomenon compared to traditional solutions. A key distinguishing feature of these modules is **bifacial technology**, enabling efficient light absorption from both sides of the panel, which, combined with the glass-glass construction, drastically increases the total annual energy yield. This solution perfectly meets the needs of investors implementing **utility-scale solar farms** and demanding commercial projects where maximizing power from the available area is crucial. Thanks to the use of large M10 wafers and an optimized number of busbars, these panels perform excellently in high-temperature conditions, offering more stable operating characteristics than older generation modules. By choosing this model, the user gains **higher efficiency in low-light conditions**, which is a significant advantage at Polish latitudes. This design effectively addresses the problem of long-term power degradation, ensuring the security and profitability of the investment for decades. It is a proposition for professionals seeking uncompromising durability and the highest power density, which clearly sets this series apart from standard products currently available on the market. ## Notable figures - At 23.7% efficiency, this panel is 0.9pp above typical \*\*N-type 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 \*\*N-type 600-650W\*\* median (227.7 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - In the top 4% for efficiency among all N-type panels ## Questions ### How does N-type TOPCon technology in the Yingli LF650M10N-66H/BF differ from classic PERC cells? N-type TOPCon cells have lower recombination losses and much better resistance to light-induced degradation (LID) than traditional P-type PERC cells. As a result, the LF650M10N-66H/BF achieves higher initial efficiency and a slower power decline over time, translating into higher energy yield throughout the system's lifetime. ### What does the bifacial design of the LF650M10N-66H/BF panel offer, and is it worth the extra cost? The bifacial module captures light from both the front and rear side thanks to its glass-glass construction. In practice, this means additional energy yield, especially with light-colored ground surfaces, elevated ground-mount racking, or utility-scale PV farms. The premium pays off faster on large, utility-scale installations than on a low-tilt residential roof. ### What warranty comes with the Yingli LF650M10N-66H/BF panels? The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. Yingli is a Tier 1 manufacturer, which adds further confidence that warranty obligations will be honored even at large sales volumes. ### Are the LF650M10N-66H/BF panels suited for large solar farms or for a single-family home roof? With 650 Wp output, large M10 wafers, and bifacial construction, this series is optimized primarily for utility-scale solar farms and commercial projects, where maximizing power density per hectare is key. On a sloped single-family home roof, the size and weight of these panels can make installation more difficult, so smaller, lighter modules are typically preferred there. ### How do the LF650M10N-66H/BF panels perform in high summer temperatures? Thanks to N-type TOPCon technology and an optimized busbar count, these modules have a better temperature coefficient than older-generation panels, meaning a smaller power drop at high operating temperatures. This is a significant advantage during summer months, when panels can heat up dozens of degrees above ambient temperature. ### Will the Yingli LF650M10N-66H/BF perform well under cloudy skies, such as in Poland? Yes, N-type TOPCon technology delivers better efficiency under low and diffuse light conditions compared to classic P-type cells. This is a meaningful advantage at Poland's latitude, where a significant part of the year is overcast, and the module still generates power more effectively than older solutions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/lf630-650m10n-66h-bf-2382-1134-30-05ab9e8fe9f0.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +1.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, lighter, +1.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, lighter, +1.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.3 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +35 W, cooler, +1.3 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +30 W, lighter, +1.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +30 W, lighter, +1.1 pp | | [Yingli LF610M10N-66H/BF](https://comparepv.com/panel/yingli-lf610m10n-66h-bf) | 610 W | -30 W, -1.1 pp | | [Yingli LF615M10N-66H/BF](https://comparepv.com/panel/yingli-lf615m10n-66h-bf) | 615 W | -25 W, -0.9 pp | | [Yingli YL620CF66 i/2](https://comparepv.com/panel/yingli-yl620cf66-i-2) | 620 W | -20 W, -0.7 pp | | [Yingli YL625CF66 i/2](https://comparepv.com/panel/yingli-yl625cf66-i-2) | 625 W | -15 W, -0.6 pp | | [Yingli YL630CF66 i/2](https://comparepv.com/panel/yingli-yl630cf66-i-2) | 630 W | -10 W, -0.4 pp | | [Yingli YL635CF66 i/2](https://comparepv.com/panel/yingli-yl635cf66-i-2) | 635 W | Very close match | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +1.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +55 W, cooler, +1.2 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +30 W, cooler, +1.1 pp | --- Source: https://comparepv.com/panel/yingli-lf640m10n-66h-bf Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.