--- title: "WINAICO WST-505BKX54-A2 Solar Panel: Specs & Datasheet | ComparePV" description: "WINAICO WST-505BKX54-A2 solar panel. Specs: 24.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/winaico-wst-505bkx54-a2" image: "https://comparepv.com/og/panel/winaico-wst-505bkx54-a2.png" updated: 2026-10-23 --- # WINAICO WST-505BKX54-A2 Efficiency leader, no clear weak spot 272 panels in the segment Back Contact 405-605 W ## Identity - **Manufacturer:** WINAICO - **Model:** WST-505BKX54-A2 - **Series:** WST-BKX54-A2 WBC Series - **Rated power:** 505 W - **Cell technology:** Back Contact - **Bifacial:** yes ## How it compares Compared against segment Back Contact 405-605 W (272 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 505 W | 480 W | Strong - top 17% | | | Module efficiency | 24.70% | 23.30% | Strong - top 1% | 43 | | Power density | 247.4 | 233.0 | Strong - top 1% | 43 | | Temperature coefficient | -0.260 | -0.260 | Typical | 515 | | Weight (kg) | 25.0 kg | 23.3 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 24.70% | 23.30% | Strong - top 1% | 43 | | Power density | 247.4 | 233.0 | Strong - top 1% | 43 | | Temperature coefficient | -0.260 | -0.260 | Typical | 515 | | Weight per kWp | 49.5 | 47.7 | Typical | 3,051 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **24.70% module efficiency** - Top 1% of the Back Contact 405-605 W segment, against a median of 23.30%. Ranked 43rd in the whole database. - **247.4 watts per square metre** - Top 1% of the Back Contact 405-605 W segment, against a median of 233.0. Ranked 43rd in the whole database. - **Best for:** Residential and commercial. ## Specification ### Electrical - **Rated power (Pmax):** 505 W - **Efficiency:** 24.70 % - **Voltage at Pmax (Vmp):** 35.64 V - **Current at Pmax (Imp):** 14.18 A - **Open-circuit voltage (Voc):** 40.94 V - **Short-circuit current (Isc):** 15.28 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.260 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** Back Contact - **Cell count:** 108 - **Bifacial:** yes - **Bifacial gain:** 20.00 ### Physical - **Length:** 1800 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 25.0 kg - **Area:** 2.04 m2 - **Power density:** 247.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 88.8 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 449 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 43 of 14129 | | Power density | 43 of 14129 | | Temperature coefficient | 515 of 14129 | | Weight | 3051 of 14129 | | Warranty | 21 of 14129 | ## About this series The WST-BKX54-A2 WBC series is a premium residential-grade module line built on **back contact (BC) technology**, where all electrodes and interconnections are relocated to the rear of the cell. As a result, the front surface is free of grid lines and busbars, delivering a uniform all-black appearance that makes it a strong choice for projects where roof aesthetics matter as much as energy output. The panels use **N-type monocrystalline cells** with bifacial properties, allowing extra energy capture from reflected ambient light without requiring specialized mounting setups. The **glass-glass construction** combined with a one-line cell interconnection structure reduces edge stress, lowering the risk of microcracks and improving long-term mechanical durability. The series is aimed at homeowners and investors seeking a solution that pairs high visual appeal with low power degradation over time. The manufacturer backs the modules with a **30-year product warranty and linear performance warranty**, translating into a lower cost of energy across the full lifecycle of the installation. This is a fitting choice for those who value modern panel design without sacrificing the reliability typical of N-type technology. ## Notable figures - 24.7% module efficiency - 0.7pp better than the \*\*Back Contact 500-550W\*\* median of 24.0% - At 247.4 W/m² power density, this panel generates 7.0 W/m² more per unit area than \*\*Back Contact 500-550W\*\* median (240.4 W/m²) - Temperature coefficient of -0.26%/°C matches the \*\*Back Contact 500-550W\*\* median - At 25.0 kg (1.6 kg above \*\*Back Contact 500-550W\*\* median of 23.4 kg), requires checking roof load capacity - Bifaciality factor of 40% can add 2-6% extra yield with reflective mounting surface ## Questions ### What is back contact (WBC) technology in WINAICO WST-BKX54-A2 panels? Back contact means all electrodes and cell interconnections are placed on the rear side of the module instead of the front surface. This gives the panel a fully black, busbar-free front appearance. Beyond the aesthetic benefit, the design reduces shading from interconnecting elements, resulting in slightly higher conversion efficiency compared to conventional panels. ### Is the 505 Wp WST-BKX54-A2 WBC module suitable for a single-family home? Yes, the 505 Wp maximum power combined with a uniformly black appearance makes this series especially suited for single-family rooftops where aesthetics matter. The high per-module power output allows greater energy yield with fewer panels, making it easier to install on roofs with limited surface area. ### Are WINAICO WBC Series panels bifacial, and does that translate into real energy gains? Yes, the modules use N-type monocrystalline bifacial cells, allowing them to generate power from reflected light off surrounding surfaces such as a bright roof or ground. This extra energy harvest requires no special mounting structure, though the actual gain depends on the albedo of the surface beneath the panel and the installation tilt angle. ### What warranty does WINAICO offer on the WST-BKX54-A2 WBC Series? The manufacturer provides a 30-year product warranty along with a 30-year linear performance warranty. This is among the longest warranties on the market, meaning lower power degradation over time and a reduced LCOE compared to typical 10-15/25-year warranty terms offered by other manufacturers. ### What does the glass-glass construction in WINAICO WBC panels provide, and does it improve durability? Glass-glass construction replaces the rear polymer backsheet with a second glass layer, increasing resistance to moisture ingress, UV degradation, and mechanical stress. Combined with the single-line cell interconnection layout, this reduces the risk of microcracks at the panel edges, resulting in more stable performance and a longer service life, particularly under harsh weather conditions. ### Is WINAICO a reliable solar panel manufacturer, and where are the WBC modules made? WINAICO is a Tier 1 manufacturer headquartered in Taiwan, with over a decade of presence in the solar market. Tier 1 status reflects a stable financial position and a documented bankability track record, which is important when relying on long-term warranties like the 30-year product warranty offered on the WST-BKX54-A2 WBC series. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/WINAICO_WST-505BKX54-A2_AUS_CEC_0926-ef3098c14951.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +0.3 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | -10 W, lighter | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +50 W | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | -15 W, lighter | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter | | [WINAICO WST-475BDX54-A2](https://comparepv.com/panel/winaico-wst-475bdx54-a2) | 475 W | -30 W, -1.4 pp | | [WINAICO WST-480BDX54-B2](https://comparepv.com/panel/winaico-wst-480bdx54-b2) | 480 W | -25 W, -1.2 pp | | [WINAICO WST-485BDX54-A2](https://comparepv.com/panel/winaico-wst-485bdx54-a2) | 485 W | -20 W, -0.9 pp | | [WINAICO WST-490BDX54-A2](https://comparepv.com/panel/winaico-wst-490bdx54-a2) | 490 W | -15 W, -0.7 pp | | [WINAICO WST-495BKX54-B2](https://comparepv.com/panel/winaico-wst-495bkx54-b2) | 495 W | -10 W, -0.4 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Lighter | --- Source: https://comparepv.com/panel/winaico-wst-505bkx54-a2 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.