--- title: "Yingli YL555D-49e 1/2 / YL555D-49e 1500V 1/2 Solar Panel: Specs & Datasheet | ComparePV" description: "Yingli YL555D-49e 1/2 / YL555D-49e 1500V 1/2 solar panel. Specs: 21.50% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/yingli-yl555d-49e-1-2-yl555d-49e-1500v-1-2" image: "https://comparepv.com/og/panel/yingli-yl555d-49e-1-2-yl555d-49e-1500v-1-2.png" updated: 2026-09-11 --- # Yingli YL555D-49e 1/2 / YL555D-49e 1500V 1/2 Efficiency leader, short guarantee 589 panels in the segment PERC 550-600 W ## Identity - **Manufacturer:** Yingli - **Model:** YL555D-49e 1/2 / YL555D-49e 1500V 1/2 - **Series:** YLM 3.0 Pro 1 - **Rated power:** 555 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 550-600 W (589 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 555 W | 560 W | Typical | | | Module efficiency | 21.50% | 21.29% | Strong - top 18% | 8,022 | | Power density | 214.8 | 212.9 | Strong - top 20% | 8,099 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,489 | | Weight (kg) | 28.0 kg | 30.8 kg | Typical | | | Performance warranty | 25 yrs | 27 yrs | Weak - bottom 24% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.50% | 21.29% | Strong - top 18% | 8,022 | | Power density | 214.8 | 212.9 | Strong - top 20% | 8,099 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,489 | | Weight per kWp | 50.5 | 52.7 | Typical | 3,834 | | Performance warranty | 25 yrs | 27 yrs | Weak - bottom 24% | 9,912 | ### Strengths - **21.50% module efficiency** - Top 18% of the PERC 550-600 W segment, against a median of 21.29%. - **214.8 watts per square metre** - Top 20% of the PERC 550-600 W segment, against a median of 212.9. ### Watch out for - **25 year performance warranty** - Bottom 24% of the PERC 550-600 W segment, against a median of 27 yrs. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 555 W - **Efficiency:** 21.50 % - **Voltage at Pmax (Vmp):** 42.15 V - **Current at Pmax (Imp):** 13.17 A - **Open-circuit voltage (Voc):** 49.97 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:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 28.0 kg - **Area:** 2.58 m2 - **Power density:** 214.8 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:** 455 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8022 of 14129 | | Power density | 8099 of 14129 | | Temperature coefficient | 10489 of 14129 | | Weight | 3834 of 14129 | | Warranty | 9912 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 - Efficiency of 21.5% matches the \*\*PERC 550-600W\*\* median - Power density of 214.8 W/m² matches the \*\*PERC 550-600W\*\* median - At -0.35%/°C, hot weather performance is typical for \*\*PERC 550-600W\*\* panels - At 28.0 kg, this panel is 2.8 kg lighter than \*\*PERC 550-600W\*\* median (30.8 kg) - easier handling during installation - Ranked #8022 out of 14129 panels for efficiency in the database ## 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/1752829228688-09073f6a7c55.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +3.5 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | -50 W, cooler, +3.2 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | -50 W, cooler, +3.2 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, +3.1 pp, +5 yr warranty | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, lighter, +2.9 pp | | [Yingli YL530DF72 e/2](https://comparepv.com/panel/yingli-yl530df72-e-2) | 530 W | Heavier, -1.0 pp, +5 yr warranty | | [Yingli YL535DF72 e/2](https://comparepv.com/panel/yingli-yl535df72-e-2) | 535 W | Heavier, -0.8 pp, +5 yr warranty | | [Yingli LF535M10-72H](https://comparepv.com/panel/yingli-lf535m10-72h) | 535 W | -20 W, -0.8 pp | | [Yingli YL540DF72 e/2](https://comparepv.com/panel/yingli-yl540df72-e-2) | 540 W | Heavier, -0.6 pp, +5 yr warranty | | [Yingli LF540M10-72H](https://comparepv.com/panel/yingli-lf540m10-72h) | 540 W | -15 W, -0.6 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +95 W, cooler, +3.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +85 W, cooler, +3.3 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +80 W, cooler, +3.1 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +75 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/yingli-yl555d-49e-1-2-yl555d-49e-1500v-1-2 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.