--- title: "WINAICO WST-400MGX-P3 Full Black Solar Panel: Specs & Datasheet | ComparePV" description: "WINAICO WST-400MGX-P3 Full Black solar panel. Specs: 20.44% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/winaico-wst-400mgx-p3-full-black" image: "https://comparepv.com/og/panel/winaico-wst-400mgx-p3-full-black.png" updated: 2026-10-23 --- # WINAICO WST-400MGX-P3 Full Black Middle of its segment, short guarantee 6,577 panels in the 300-500 W band, all technologies ## Identity - **Manufacturer:** WINAICO - **Model:** WST-400MGX-P3 Full Black - **Series:** WST-MGX-P3 GEMINI Series - **Rated power:** 400 W - **Cell technology:** Monocrystalline ## How it compares Compared against 300-500 W band, all technologies (6577 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 25% | | | Module efficiency | 20.44% | 21.30% | Typical | 11,632 | | Power density | 204.4 | 212.5 | Typical | 11,624 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 24% | 10,489 | | Weight (kg) | 21.5 kg | 22.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.44% | 21.30% | Typical | 11,632 | | Power density | 204.4 | 212.5 | Typical | 11,624 | | Temperature coefficient | -0.350 | -0.300 | Weak - bottom 24% | 10,489 | | Weight per kWp | 53.8 | 53.2 | Typical | 7,849 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,912 | ### Watch out for - **25 year performance warranty** - Bottom 19% of the 300-500 W band, against a median of 30 yrs. - **-0.350 %/°C temperature coefficient** - Bottom 24% of the 300-500 W band, against a median of -0.300. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.44 % - **Voltage at Pmax (Vmp):** 30.71 V - **Current at Pmax (Imp):** 13.04 A - **Open-circuit voltage (Voc):** 37.29 V - **Short-circuit current (Isc):** 13.69 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:** 0.040 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 108 ### Physical - **Length:** 1724 mm - **Width:** 1135 mm - **Thickness:** 35 mm - **Weight:** 21.5 kg - **Area:** 1.96 m2 - **Power density:** 204.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.3 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.53 % - **Output after 30 years:** 331 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11632 of 14129 | | Power density | 11624 of 14129 | | Temperature coefficient | 10489 of 14129 | | Weight | 7849 of 14129 | | Warranty | 9912 of 14129 | ## About this series The WINAICO WST-MGX-P3 GEMINI series consists of monocrystalline modules built on **half-cut cells** connected in a **multi-busbar design with reflective wire**, which reduces current losses and boosts energy yield even under partial shading or minor cell microcracks. This architecture lets the panels perform better in demanding installation conditions - on roofs with complex geometry, or under light shading from chimneys or antennas - where conventional modules lose considerably more power. GEMINI targets private investors and installers who prioritize the long-term durability of their system rather than just the lowest price per watt. Every single module undergoes a **complete, 100 percent quality inspection** that eliminates microcracks and soldering defects at the production stage, resulting in consistent parameters and a lower risk of warranty claims throughout the system's service life. A robust aluminum frame provides strong resistance to snow and wind loads, a benefit installers working in harsh climates will appreciate. The manufacturer backs the series with a **25-year linear performance warranty** and minimal annual degradation, which has a real impact on lowering the LCOE of the installation over its entire lifetime. It's a solution for anyone looking for a balance between proven silicon technology and genuine investment security. ## Notable figures - Module efficiency of 20.4% is 1.4pp below average for \*\*database\*\* panels (median: 21.8%) - 204.4 W/m² power density is 13.7 W/m² below \*\*database\*\* median (218.1 W/m²) - requires larger installation area - -0.35%/°C temperature coefficient - 0.05pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - At 21.5 kg, this panel is 5.0 kg lighter than \*\*database\*\* median (26.5 kg) - easier handling during installation - In the top 82% for efficiency among all N-type panels ## Questions ### What is the maximum power output of WINAICO WST-MGX-P3 GEMINI panels? The WST-MGX-P3 GEMINI series reaches a maximum power output of up to 410 Wp. This is achieved through monocrystalline half-cut cells arranged in a multi-busbar configuration with a reflective interconnect wire, which reduces current losses and increases energy yield compared to classic full-cell modules of similar size. ### How does GEMINI's half-cut cell technology differ from standard cells? In half-cut technology, each silicon cell is cut in half, which reduces resistive losses and limits the impact of micro-defects in individual cell fragments on the module's overall performance. The GEMINI series also uses a reflective interconnect wire between busbars that reuses light falling between cells, boosting energy yield especially under partial shading. ### What is the warranty on WINAICO GEMINI panels? The manufacturer offers a 25-year product warranty and a 25-year linear power performance warranty with minimal annual degradation. This means that even after a quarter-century of operation, the panel still delivers the defined share of its original power output, which meaningfully lowers the LCOE over the system's full lifetime. ### Are GEMINI panels suitable for roofs with complex geometry, such as chimneys or antennas? Yes, this is one of the series' main use cases. The half-cut cell configuration with a reflective interconnect wire limits power loss from partial shading cast by chimneys, antennas, or dormers, unlike classic modules that lose significantly more energy in such conditions. The durable aluminum frame also provides stability on structurally complex roofs. ### Is WINAICO GEMINI a bifacial panel? No, the WST-MGX-P3 GEMINI series is a monofacial module, generating energy only from the front side. Despite lacking bifacial technology, thanks to the half-cut cell architecture and 100 percent quality inspection during production, the modules deliver stable parameters and low claim risk throughout their service life. ### Is WINAICO GEMINI worth choosing if price per watt is the main priority? If the lowest purchase price per watt is the only priority, GEMINI may not be the first choice, since this Tier 1 Taiwanese manufacturer focuses on long-term durability and low power degradation rather than the lowest upfront cost. For investors calculating total energy cost over the 25-year warranty period, this series typically outperforms cheaper alternatives with weaker quality control. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/WINAICO_Datasheet_WST-410MGX-P3_EN_EU_0123-fe7d2b1fe804.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | Cooler, +2.6 pp, +5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +2.6 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, +2.6 pp, +5 yr warranty | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.6 pp | | [WINAICO WST-405MGX-E5](https://comparepv.com/panel/winaico-wst-405mgx-e5) | 405 W | Cooler, +0.4 pp | | [WINAICO WST-410MGX-P3](https://comparepv.com/panel/winaico-wst-410mgx-p3) | 410 W | +10 W, +0.5 pp | | [WINAICO WST-410MGX-E3](https://comparepv.com/panel/winaico-wst-410mgx-e3) | 410 W | +10 W, +0.6 pp | | [WINAICO WST-415MGX-E3](https://comparepv.com/panel/winaico-wst-415mgx-e3) | 415 W | +15 W, +0.9 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +110 W, cooler, +4.6 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +95 W, cooler, +4.4 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +105 W, cooler, +4.3 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | +105 W, cooler, +4.3 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +90 W, cooler, +4.1 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +100 W, cooler, +4.1 pp | --- Source: https://comparepv.com/panel/winaico-wst-400mgx-p3-full-black Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.