--- title: "Yingli LF505M10-66H Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli LF505M10-66H solar panel. Specs: 21.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/yingli-lf505m10-66h" image: "https://comparepv.com/og/panel/yingli-lf505m10-66h.png" updated: 2026-09-11 --- # Yingli LF505M10-66H Efficiency leader, weak in heat 709 panels in the segment PERC 500-550 W ## Identity - **Manufacturer:** Yingli - **Model:** LF505M10-66H - **Series:** LF505M10-66H - **Rated power:** 505 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 500-550 W (709 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 505 W | 535 W | Weak - bottom 11% | | | Module efficiency | 21.30% | 20.90% | Strong - top 4% | 8,585 | | Power density | 212.7 | 209.0 | Strong - top 6% | 8,824 | | Temperature coefficient | -0.354 | -0.350 | Weak - bottom 13% | 12,365 | | Weight (kg) | 26.5 kg | 28.3 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 22% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.30% | 20.90% | Strong - top 4% | 8,585 | | Power density | 212.7 | 209.0 | Strong - top 6% | 8,824 | | Temperature coefficient | -0.354 | -0.350 | Weak - bottom 13% | 12,365 | | Weight per kWp | 52.5 | 53.0 | Typical | 6,063 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 22% | 9,912 | ### Strengths - **21.30% module efficiency** - Top 4% of the PERC 500-550 W segment, against a median of 20.90%. Ranked 8,585th in the whole database. - **212.7 watts per square metre** - Top 6% of the PERC 500-550 W segment, against a median of 209.0. Ranked 8,824th in the whole database. ### Watch out for - **-0.354 %/°C temperature coefficient** - Bottom 13% of the PERC 500-550 W segment, against a median of -0.350. - **25 year performance warranty** - Bottom 22% of the PERC 500-550 W segment, against a median of 30 yrs. - **Best for:** Small roofs that need every watt and roofs where every square metre counts. - **Not ideal for:** Hot climates and owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 505 W - **Efficiency:** 21.30 % - **Voltage at Pmax (Vmp):** 38.62 V - **Current at Pmax (Imp):** 13.08 A - **Open-circuit voltage (Voc):** 46.40 V - **Short-circuit current (Isc):** 13.88 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:** PERC - **Cell count:** 132 ### Physical - **Length:** 2094 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 26.5 kg - **Area:** 2.37 m2 - **Power density:** 212.7 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:** 414 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8585 of 14129 | | Power density | 8824 of 14129 | | Temperature coefficient | 12365 of 14129 | | Weight | 6063 of 14129 | | Warranty | 9912 of 14129 | ## About this series The Yingli LF505M10-66H series focuses on **advanced N-type cell technology**, which effectively eliminates the problem of light-induced degradation and guarantees stable module operation for decades. Thanks to the use of M10 standard silicon wafers and a precise half-cut design, these panels show significantly lower susceptibility to the negative effects of shading, which directly translates into higher energy yields in real-world weather conditions. What particularly distinguishes this series is its **high power density**, allowing for the generation of more electricity from every square meter of available surface. The LF505M10-66H series solves the dilemma between performance and durability by offering an **excellent temperature coefficient**, which helps the system maintain high efficiency even during extreme summer heat. This is a solution dedicated primarily to modern residential and commercial installations where a fast return on investment is key. The use of **multi-busbar technology** further strengthens cell resistance to micro-cracks and optimizes the flow of electrical charges. Compared to older technologies, this series offers **better performance in low-light conditions**, making it an unrivaled choice in the Polish climate and providing investors with maximum predictability of energy gains. ## Notable figures - Efficiency of 21.3% matches the \*\*PERC 500-550W\*\* median - At 212.7 W/m² power density, this panel generates 3.7 W/m² more per unit area than \*\*PERC 500-550W\*\* median (209.0 W/m²) - Temperature coefficient of -0.35%/°C matches the \*\*PERC 500-550W\*\* median - 26.5 kg weight - 1.8 kg lighter than \*\*PERC 500-550W\*\* median (28.3 kg), reducing installation effort - #8585 for efficiency, #12365 for temperature performance out of 14129 panels ## Questions ### What is the actual power output of Yingli LF505M10-66H panels and how much energy can I generate? The LF505M10-66H series reaches a maximum power of 505 Wp thanks to M10 silicon wafers and half-cut cell design, which increases power density per square meter. For a typical residential 6-8 kWp installation, this means fewer modules are needed compared to older series, reducing the required roof surface area. ### What warranty comes with Yingli LF505M10-66H panels? The manufacturer provides a 12-year product warranty covering material and workmanship defects, plus a 25-year power output warranty guaranteeing a minimum generation level throughout the panel's lifetime. This is standard for tier 1 manufacturers like Yingli and gives investors predictable returns on their PV installation. ### How does PERC cell technology in the Yingli LF505M10-66H differ from standard monocrystalline cells? PERC cells feature an additional rear passivation layer that reflects unused photons back into the cell, boosting efficiency. Combined with the half-cut and multi-busbar technology used in this series, this results in better resistance to microcracks and improved low-light performance, which matters in Poland's climate conditions. ### Do Yingli LF505M10-66H panels perform well on hot days? Yes, the LF505M10-66H series has an excellent temperature coefficient, meaning less power loss as module temperature rises above the standard 25°C. In practice, this means the system loses less energy on hot summer days compared to panels built with older technologies, maintaining high electricity output. ### Is Yingli a trustworthy manufacturer, and where are LF505M10-66H panels made? Yingli is a Chinese manufacturer classified as tier 1, indicating strong financial stability, in-house production lines, and inclusion on Bloomberg New Energy Finance's list of reputable PV module suppliers. This status translates into greater confidence in warranty enforcement compared to smaller, lesser-known brands. ### Are Yingli LF505M10-66H panels bifacial? No, the LF505M10-66H series consists of monofacial panels, meaning they generate energy only from the front side of the module. This is standard for typical rooftop installations, where a lack of reflected light from the ground means bifacial panels would offer no additional benefit. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/5-ee881da6bd40.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +3.7 pp, +5 yr warranty | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, +3.4 pp, +5 yr warranty | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | Cooler, +3.4 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +50 W, cooler, +3.3 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +3.2 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, +3.2 pp, +5 yr warranty | | [Yingli LF485M10-66H](https://comparepv.com/panel/yingli-lf485m10-66h) | 485 W | -20 W, -0.9 pp | | [Yingli LF490M10-66H](https://comparepv.com/panel/yingli-lf490m10-66h) | 490 W | -15 W, -0.7 pp | | [Yingli LF495M10-66H](https://comparepv.com/panel/yingli-lf495m10-66h) | 495 W | -10 W, -0.5 pp | | [Yingli LF500M10-66H](https://comparepv.com/panel/yingli-lf500m10-66h) | 500 W | Very close match | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +85 W, cooler, +2.5 pp | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +80 W, cooler, +2.3 pp | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +75 W, cooler, +2.2 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +75 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/yingli-lf505m10-66h Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.