--- title: "WINAICO WST-500BKX54-B3 Solar Panel: Specs & Datasheet | ComparePV" description: "WINAICO WST-500BKX54-B3 solar panel. Specs: 24.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/winaico-wst-500bkx54-b3" image: "https://comparepv.com/og/panel/winaico-wst-500bkx54-b3.png" updated: 2026-10-23 --- # WINAICO WST-500BKX54-B3 Efficiency leader, no clear weak spot 271 panels in the segment Back Contact 400-600 W ## Identity - **Manufacturer:** WINAICO - **Model:** WST-500BKX54-B3 - **Series:** WST-BKX54-B3 WBC Ultra Black Series - **Rated power:** 500 W - **Cell technology:** Back Contact - **Bifacial:** yes ## How it compares Compared against segment Back Contact 400-600 W (271 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 500 W | 475 W | Strong - top 17% | | | Module efficiency | 24.50% | 23.30% | Strong - top 4% | 82 | | Power density | 245.0 | 233.0 | Strong - top 4% | 85 | | 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 | 24.50% | 23.30% | Strong - top 4% | 82 | | Power density | 245.0 | 233.0 | Strong - top 4% | 85 | | Temperature coefficient | -0.260 | -0.260 | Typical | 515 | | Weight per kWp | 50.0 | 47.8 | Typical | 3,329 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **24.50% module efficiency** - Top 4% of the Back Contact 400-600 W segment, against a median of 23.30%. Ranked 82nd in the whole database. - **245.0 watts per square metre** - Top 4% of the Back Contact 400-600 W segment, against a median of 233.0. Ranked 85th in the whole database. - **Best for:** Residential and BIPV. ## Specification ### Electrical - **Rated power (Pmax):** 500 W - **Efficiency:** 24.50 % - **Voltage at Pmax (Vmp):** 33.97 V - **Current at Pmax (Imp):** 14.72 A - **Open-circuit voltage (Voc):** 40.77 V - **Short-circuit current (Isc):** 15.48 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:** 245.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.35 % - **Output after 30 years:** 444 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 82 of 14129 | | Power density | 85 of 14129 | | Temperature coefficient | 515 of 14129 | | Weight | 3329 of 14129 | | Warranty | 21 of 14129 | ## About this series The WBC Ultra Black G2 series is WINAICO's answer for homeowners who want a visually striking rooftop installation without sacrificing performance. The modules are built on **back contact (WBC) technology**, where all electrodes are moved to the rear of the cell, leaving the front surface free of visible grid lines and busbars - the result is a uniform, deep black surface with no striping effect. The series uses **N-type monocrystalline cells** with a **bifacial** design, allowing the panel to capture light reflected from the roof or surroundings and boost energy yield without increasing the installed area. The module features a **glass-glass** construction, resistant to microcracks, moisture ingress, and UV degradation, while the black anodized aluminum frame completes a clean, minimalist look. The series is PFAS-free, aligning with growing environmental requirements in the construction sector. Backed by a **30-year product warranty** and a linear power warranty, investors gain confidence in long-term performance stability. This solution is aimed primarily at premium single-family home customers for whom both roof aesthetics and maximum energy yield per square meter matter equally. ## Notable figures - At 24.5% efficiency, this panel is on par with typical \*\*Back Contact 500-550W\*\* modules - 244.9 W/m² power density - 4.5 W/m² more than \*\*Back Contact 500-550W\*\* median (240.4 W/m²), more power per roof area - At -0.26%/°C, hot weather performance is typical for \*\*Back Contact 500-550W\*\* panels - At 25.0 kg (1.6 kg above \*\*Back Contact 500-550W\*\* median of 23.4 kg), requires checking roof load capacity - #82 for efficiency, #515 for temperature performance out of 14129 panels ## Questions ### What is back contact (WBC) technology in WINAICO WST-BKX54-B3 panels? Back contact (WBC) is a cell design where all electrodes and busbars are moved to the rear side of the cell. This leaves the front surface completely free of visible metal grids, resulting in a uniform, deep black appearance without the characteristic striping. Removing front-side shading also increases the active cell area exposed to light, which boosts overall conversion efficiency. ### Are WBC Ultra Black panels bifacial, and does that translate into real energy gains? Yes, the series uses N-type monocrystalline bifacial cells, meaning the module also generates energy from light reflected onto its rear side. The actual gain depends on the surface beneath the array, mounting angle, and roof clearance - on bright, reflective surfaces it can add a few extra percent of energy output without increasing the installed area. ### What warranty does WINAICO offer on the WST-BKX54-B3 WBC Ultra Black series, and what does it cover? The manufacturer provides a 30-year product warranty along with a 30-year linear power warranty. This means WINAICO, a Tier 1 manufacturer based in Taiwan, guarantees the module's structural integrity and a defined power output level over three decades, giving investors confidence in the long-term stability of their installation. ### Is the glass-glass construction of WBC Ultra Black panels more durable than a standard glass-backsheet module? Yes, the glass-glass design replaces the rear backsheet with an additional glass layer, significantly improving resistance to microcracks, moisture ingress, and UV-related degradation. This construction is also less prone to laminate yellowing over time and better retains power output, aligning well with the series' 30-year product warranty. ### Who is the WINAICO WBC Ultra Black series designed for? This series targets premium single-family homeowners who want both an elegant roof and facade appearance and maximum energy yield per square meter. The uniform black surface without visible grid lines, paired with an anodized black aluminum frame, blends well with modern architecture without sacrificing performance, with module power reaching up to 500 Wp. ### Are WBC Ultra Black panels PFAS-free, and why does that matter to buyers? Yes, the entire series is manufactured without PFAS, the persistent fluorinated compounds sometimes found in laminating materials and coatings used in earlier solar panel generations. For investors, this means better compliance with tightening environmental regulations in construction and easier qualification for green building certifications or subsidy programs. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/WINAICO_WST-500BKX54-B3_EU_0926-c0748ebc864a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +0.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Lighter, +0.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | Very close match | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | -10 W, lighter | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Lighter | | [WINAICO WST-475BDX54-A2](https://comparepv.com/panel/winaico-wst-475bdx54-a2) | 475 W | -25 W, -1.2 pp | | [WINAICO WST-480BDX54-B2](https://comparepv.com/panel/winaico-wst-480bdx54-b2) | 480 W | -20 W, -1.0 pp | | [WINAICO WST-485BDX54-A2](https://comparepv.com/panel/winaico-wst-485bdx54-a2) | 485 W | -15 W, -0.7 pp | | [WINAICO WST-490BDX54-A2](https://comparepv.com/panel/winaico-wst-490bdx54-a2) | 490 W | -10 W, -0.5 pp | | [WINAICO WST-495BKX54-B2](https://comparepv.com/panel/winaico-wst-495bkx54-b2) | 495 W | Very close match | --- Source: https://comparepv.com/panel/winaico-wst-500bkx54-b3 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.