--- title: "Yingli YL550DF72 e/2 Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli YL550DF72 e/2 solar panel. Specs: 21.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/yingli-yl550df72-e-2" image: "https://comparepv.com/og/panel/yingli-yl550df72-e-2.png" updated: 2026-09-11 --- # Yingli YL550DF72 e/2 Warranty pick, heavy for its output 589 panels in the segment PERC 550-600 W ## Identity - **Manufacturer:** Yingli - **Model:** YL550DF72 e/2 - **Series:** YLM 3.0 Pro 1 - **Rated power:** 550 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 550-600 W (589 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 550 W | 560 W | Weak - bottom 15% | | | Module efficiency | 21.30% | 21.29% | Typical | 8,585 | | Power density | 212.9 | 212.9 | Typical | 8,563 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,489 | | Weight (kg) | 32.0 kg | 30.8 kg | Weak - bottom 25% | | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.30% | 21.29% | Typical | 8,585 | | Power density | 212.9 | 212.9 | Typical | 8,563 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,489 | | Weight per kWp | 58.2 | 52.7 | Weak - bottom 25% | 11,682 | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Strengths - **30 year performance warranty** - Top 25% of the PERC 550-600 W segment, against a median of 27 yrs. ### Watch out for - **58.2 kg per kWp** - Bottom 25% of the PERC 550-600 W segment, against a median of 52.7. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 550 W - **Efficiency:** 21.30 % - **Voltage at Pmax (Vmp):** 41.90 V - **Current at Pmax (Imp):** 13.13 A - **Open-circuit voltage (Voc):** 49.75 V - **Short-circuit current (Isc):** 14.04 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.280 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 39 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 - **Bifacial:** yes ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.0 kg - **Area:** 2.58 m2 - **Power density:** 212.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 467 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8585 of 14129 | | Power density | 8563 of 14129 | | Temperature coefficient | 10489 of 14129 | | Weight | 11682 of 14129 | | Warranty | 21 of 14129 | ## About this series Yingli YLM 3.0 Pro 1 modules are monocrystalline, based on P-type PERC cell technology, designed for stable performance in real-world operating conditions, not just in the lab. The use of large cell formats and a half-cut configuration translates to **lower internal losses** and better tolerance to partial shading - crucial on rooftops with chimneys, window wells, or edge-mounted installations. These modules also boast **high weather resistance**, thanks to refined lamination materials and a robust construction, facilitating safe mounting on rooftop and ground structures. The series offers **positive power tolerance**, ensuring that installers and investors achieve predictable yield without the risk of an underperforming module in a string. The YLM 3.0 Pro 1 is suitable for projects targeting commercial and agricultural applications, as well as larger consumer-scale systems, where **reliable energy output**, longevity, and easy integration with standard inverters matter. What sets it apart is its practical approach - a focus on reliability and steady investment returns, rather than chasing mere claims. ## Notable figures - At 21.3% efficiency, this panel is on par with typical \*\*PERC 550-600W\*\* modules - At 212.9 W/m² power density, roof space requirements are typical for \*\*PERC 550-600W\*\* panels - Temperature coefficient of -0.35%/°C matches the \*\*PERC 550-600W\*\* median - Weight of 32.0 kg is 1.2 kg above \*\*PERC 550-600W\*\* median (30.8 kg) - verify structural support - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### What is the maximum power output of the Yingli YLM 3.0 Pro 1 panel? The top variant of the YLM 3.0 Pro 1 series reaches up to 555 Wp. The panel is built with 144 monocrystalline PERC cells in a half-cut layout, delivering high efficiency within a standard module format. This means each panel produces more energy per roof area than older full-cell designs. ### Are Yingli YLM 3.0 Pro 1 panels suitable for a sloped residential roof? Yes, the series works well both in larger commercial installations and in residential prosumer systems on sloped roofs. The half-cut cell layout improves shading tolerance, which matters on roofs with chimneys, dormers, or nearby trees. The durable laminate construction also supports safe mounting on standard roof racking systems. ### What warranty comes with Yingli YLM 3.0 Pro 1 panels? Yingli provides a 12-year product warranty and a 30-year linear power warranty. This means the manufacturer guarantees a defined performance level throughout three decades of operation, giving homeowners and commercial buyers a predictable return on investment. ### How does PERC cell technology in the YLM 3.0 Pro 1 differ from standard monocrystalline cells? PERC (Passivated Emitter and Rear Cell) cells feature an extra rear-side passivation layer that reflects unused light back into the cell, boosting efficiency. Combined with half-cut technology and large-format cells, this results in lower internal losses and better module performance under partial shading or elevated operating temperatures. ### Is Yingli a tier 1 manufacturer worth trusting for a large investment? Yes, Yingli is listed as a tier 1 manufacturer, reflecting solid financial standing and a long-established presence in the PV market. Headquartered in China, it is one of the more recognized solar panel suppliers worldwide, which simplifies warranty service and spare parts availability for larger commercial or agricultural projects. ### Do YLM 3.0 Pro 1 panels have a positive power tolerance? Yes, the series offers positive power tolerance, meaning the actual output never falls below the rated nameplate value. For installers and investors, this ensures predictable energy yield without the risk of receiving an underperforming unit from a given production batch. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1752829017873-9a24d02a2660.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.7 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.5 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.4 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | Cooler, lighter, +3.4 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.3 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +3.2 pp | | [Yingli YL530DF72 e/2](https://comparepv.com/panel/yingli-yl530df72-e-2) | 530 W | -20 W, -0.8 pp | | [Yingli YL535DF72 e/2](https://comparepv.com/panel/yingli-yl535df72-e-2) | 535 W | -15 W, -0.6 pp | | [Yingli LF535M10-72H](https://comparepv.com/panel/yingli-lf535m10-72h) | 535 W | Lighter, -0.6 pp, -5 yr warranty | | [Yingli YL540DF72 e/2](https://comparepv.com/panel/yingli-yl540df72-e-2) | 540 W | -10 W, -0.4 pp | | [Yingli LF540M10-72H](https://comparepv.com/panel/yingli-lf540m10-72h) | 540 W | Lighter, -0.4 pp, -5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +100 W, cooler, +3.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +95 W, cooler, +3.7 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +85 W, cooler, +3.3 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +80 W, cooler, +3.1 pp | --- Source: https://comparepv.com/panel/yingli-yl550df72-e-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.