--- title: "Yingli YL620CF66 i/2 Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli YL620CF66 i/2 solar panel. Specs: 23.00% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/yingli-yl620cf66-i-2" image: "https://comparepv.com/og/panel/yingli-yl620cf66-i-2.png" updated: 2026-09-11 --- # Yingli YL620CF66 i/2 Solid all-round for its segment 1,085 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Yingli - **Model:** YL620CF66 i/2 - **Series:** PANDA 3.0 Pro 2 - **Rated power:** 620 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1085 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 620 W | Typical | | | Module efficiency | 23.00% | 22.80% | Typical | 1,970 | | Power density | 229.5 | 227.7 | Typical | 2,243 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 32.0 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 | 23.00% | 22.80% | Typical | 1,970 | | Power density | 229.5 | 227.7 | Typical | 2,243 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 51.6 | 53.1 | Typical | 5,023 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Residential, commercial, utility-scale, cold-climate and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 23.00 % - **Voltage at Pmax (Vmp):** 41.14 V - **Current at Pmax (Imp):** 15.07 A - **Open-circuit voltage (Voc):** 49.08 V - **Short-circuit current (Isc):** 16.04 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.042 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.0 kg - **Area:** 2.70 m2 - **Power density:** 229.5 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:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1970 of 14129 | | Power density | 2243 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 5023 of 14129 | | Warranty | 21 of 14129 | ## About this series The Yingli PANDA 3.0 Pro 2 series are monocrystalline n-type solar modules based on **TOPCon** technology, designed for high energy yield not only under ideal conditions but also in low irradiance and demanding climates. The applied **surface passivation** and tunnel contact architecture minimize recombination losses, resulting in more stable performance over time and better efficiency at higher temperatures. This is an excellent choice for investors seeking to genuinely increase energy output from the same roof or ground area while simultaneously reducing the risk of power degradation over the years. Dual-sided variants support **rear side yield**, which is particularly relevant for light-colored roofs, rooftop installations, and carports. The series also stands out for its **high reliability** in installations exposed to environmental stress, making it suitable for both residential and commercial/industrial distributed PV systems. ## Notable figures - At 23.0% efficiency, this panel is on par with typical \*\*TOPCon 600-650W\*\* modules - At 229.5 W/m² power density, roof space requirements are typical for \*\*TOPCon 600-650W\*\* panels - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 600-650W\*\* median - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 14% for efficiency among all TOPCon panels ## Questions ### What is the maximum power output of the Yingli PANDA 3.0 Pro 2 panel? The top models in the PANDA 3.0 Pro 2 series reach up to 645 Wp rated power. This is achieved through a 132-cell design based on large n-type monocrystalline cells with TOPCon technology, which deliver higher energy output from the same surface area than older PERC panels of similar size thanks to lower recombination losses. ### How does the TOPCon technology in the PANDA 3.0 Pro 2 differ from standard PERC panels? TOPCon uses an additional passivation layer and tunnel contact architecture that significantly reduces electron recombination losses. In practice, this means higher efficiency, a smaller power drop at high temperatures, and more stable energy production over time compared to conventional p-type PERC cells. ### Is the bifacial version of the PANDA 3.0 Pro 2 worth it for a residential roof? The bifacial variant performs best on light-colored, reflective roof surfaces, ground-mounted structures, and carports, where the rear side captures additional reflected light. On dark sloped roofs with low clearance, the extra rear-side yield will be smaller, but the panel still functions correctly as a high-power monofacial-equivalent module. ### What warranty comes with the Yingli PANDA 3.0 Pro 2 panels? The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. Yingli is a Tier 1 manufacturer headquartered in China, which supports financial stability and a realistic service path for warranty claims over this long period. ### Do PANDA 3.0 Pro 2 panels perform well in hot climates? Yes, this is one of the key strengths of the TOPCon technology used in this series. Thanks to surface passivation, the panels lose less power as cell temperature rises compared to conventional PERC modules, which matters on poorly ventilated roofs or in regions with high summer temperatures where standard panels lose noticeable efficiency. ### Is the Yingli PANDA 3.0 Pro 2 series better suited for residential or commercial use? The series is versatile: the high single-module power output (up to 645 Wp) and good performance under low irradiance make it suitable for residential rooftop installations as well as larger commercial systems or solar farms, where maximizing energy yield from limited space and reliability under environmental stress are priorities. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1763542489051-2fb1eabc349d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +2.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.0 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +1.8 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +1.8 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.8 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +1.8 pp | | [Yingli LF610M10N-66H/BF](https://comparepv.com/panel/yingli-lf610m10n-66h-bf) | 610 W | -10 W, -0.4 pp | | [Yingli LF615M10N-66H/BF](https://comparepv.com/panel/yingli-lf615m10n-66h-bf) | 615 W | Very close match | | [Yingli YL625CF66 i/2](https://comparepv.com/panel/yingli-yl625cf66-i-2) | 625 W | Very close match | | [Yingli YL630CF66 i/2](https://comparepv.com/panel/yingli-yl630cf66-i-2) | 630 W | +10 W, +0.3 pp | | [Yingli YL635CF66 i/2](https://comparepv.com/panel/yingli-yl635cf66-i-2) | 635 W | +15 W, +0.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +2.2 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.0 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.0 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +55 W, cooler, +2.0 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +75 W, cooler, +1.9 pp | --- Source: https://comparepv.com/panel/yingli-yl620cf66-i-2 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.