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WINAICO Brand review

WST-495BKX54-B2

495 Wp Back Contact Bifacial 2000%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,883 of 14,129
Compare panels Datasheet PDF
Power (Wp)
495
Strong · top 4%
Efficiency (%)
24.30
Strong · top 8%
Density (Wp/m²)
242.5
Strong · top 12%
Temp (%/°C)
-0.260
Typical · median -0.260
Weight (kg)
25.0
Typical · median 23.5 kg
Warranty (yrs)
30
Typical · median 30 yrs

The WST-BKX54-B2 WBC Ultra Black G2 series from WINAICO is a residential-focused module line where rooftop aesthetics go hand in hand with high energy yield. The back-contact (WBC) technology used here eliminates visible cell grids and busbars from the front surface, giving the panel a uniform, deep black appearance without the characteristic grid effect seen on conventional half-cut modules. This makes the series particularly appealing to installers and homeowners for whom roof appearance matters just as much as electrical performance - for example, on visible, street-facing roof sections of single-family homes. The modules use bifacial N-type monocrystalline cells in a glass-glass construction, delivering additional energy yield from the rear side and greater resistance to long-term degradation compared to conventional P-type structures. A black anodized frame ties the whole design together in a consistent color scheme. The series is certified for PID resistance and offers enhanced resistance to snow loads and hailstorms, with production carried out without the use of PFAS. WINAICO backs the modules with a 30-year product warranty and a linear power warranty, making this series a solid choice for anyone seeking a durable, aesthetically consistent PV solution for a single-family rooftop.

Ranking

167 panels in the segment Back Contact 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.30% 23.52% Strong · top 8% 145
Power density 242.5 235.2 Strong · top 12% 174
Temperature coefficient -0.260 -0.260 Typical 515
Weight per kWp 50.5 48.5 Typical 3,893
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Residential and BIPV.

Strengths
24.30% module efficiency

Top 8% of the Back Contact 450-500 W segment, against a median of 23.52%. Ranked 145th in the whole database.

242.5 watts per square metre

Top 12% of the Back Contact 450-500 W segment, against a median of 235.2.

Notes from the database
  • At 24.3% efficiency, this panel is 0.8pp above typical Back Contact 450-500W modules (median: 23.5%)
  • 242.5 W/m² power density - 7.3 W/m² more than Back Contact 450-500W median (235.2 W/m²), more power per roof area
  • At -0.26%/°C, hot weather performance is typical for Back Contact 450-500W panels
  • At 25.0 kg, this panel is 1.5 kg heavier than the Back Contact 450-500W median (23.5 kg) - more demanding for installation crews
  • In the top 1% for efficiency among all Back Contact panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 495 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.30 % Strong Segment median 23.52%
Vmpp · Impp 35.44 V · 13.98 A Operating point at max power
Voc · Isc 40.74 V · 15.08 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1800×1134×35 mm · 2.04 m² of roof
Weight 25.0 kg Typical Typical · median 23.5 kg
Cells 108 · Back Contact Monocrystalline
Bifaciality 2000 % Rear output as a share of front
Coefficient Pmax -0.260 %/°C Typical median -0.260 of its segment
Coefficient Voc · Isc -0.220 · 0.050 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 30 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 85.0 % Equals 440 W guaranteed
Degradation 1.00 → 0.35 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.260 %/°C against a segment median of -0.260
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
WINAICO WST-495BKX54-B2 495 W 24.30% -0.260 25.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +15 W, cooler, +0.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Lighter, +0.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +0.4 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +10 W, +0.4 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Lighter
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Lighter
WST-475BDX54-A2 475 W 23.30% -0.260 25.0 kg -20 W, -1.0 pp
WST-480BDX54-B2 480 W 23.50% -0.260 25.0 kg -15 W, -0.8 pp
WST-485BDX54-A2 485 W 23.80% -0.260 25.0 kg -10 W, -0.5 pp
WST-490BDX54-A2 490 W 24.00% -0.260 25.0 kg -0.3 pp

Found 213 panels of the same or similar size to this one, within ±10 mm. See them here Found 217 panels of the same or similar size to this one, within ±25 mm. See them here Found 1735 panels of the same or similar size to this one, within ±50 mm. See them here Found 4051 panels of the same or similar size to this one, within ±100 mm. See them here

About the WST-BKX54-B2 WBC Ultra Black G2 Series series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is the difference between WINAICO WST-BKX54-B2 back-contact (WBC) technology and classic half-cut modules?
In back-contact (WBC) technology, all busbars and grid lines are moved to the back of the cell, giving the front surface a uniform, deep black appearance with no visible metallization lines. Classic half-cut modules have visible busbars on the front, resulting in a less aesthetic, grid-like look. WBC also slightly improves energy yield since it eliminates shading of the surface caused by conductive elements.
Are WINAICO WBC Ultra Black G2 panels bifacial, and does that actually translate into more energy?
Yes, the series uses bifacial N-type monocrystalline cells in a glass-glass construction. The rear side of the module also generates energy from light reflected off the roof or surroundings, which in typical rooftop installations can add a few percent of extra yield depending on roof color and mounting angle. N-type cells are also more resistant to long-term degradation than classic P-type structures.
What is the maximum power output of the WST-BKX54-B2 series, and is it enough for a single-family home?
Modules in this series reach up to 500 Wp. For a typical single-family home with a 4-6 kWp demand, 8 to 12 panels are usually sufficient, depending on energy consumption and available roof area. The high per-unit power allows fewer modules to be used to reach the target system size.
What warranty covers WINAICO Ultra Black G2 panels, and what does a linear power warranty mean in practice?
The manufacturer provides a 30-year product warranty along with a 30-year linear power warranty. A linear warranty means performance degradation is spread evenly over time rather than in step drops as seen in older warranty models. In practice, after 30 years the module should still produce a significant share of its original power, with a guaranteed performance level specified for each year of operation.
Does the black frame and black surface of the WBC Ultra Black G2 affect heating and summer performance?
A darker surface can heat up slightly more on sunny days, which theoretically reduces output since PV cells lose power at higher temperatures. WINAICO offsets this with the glass-glass construction and back-contact technology, which help dissipate heat. In practice, the performance difference compared to standard modules is minimal, and the uniform black aesthetic is the main reason customers choose this series.
Are WINAICO WST-BKX54-B2 panels resistant to hail and heavy snow loads, important for roofs in Poland?
Yes, the series has certified enhanced resistance to snow loads and hail impact, which matters in the Polish climate with heavy winter snowfall and summer hailstorms. The modules also carry PID (Potential Induced Degradation) resistance certification, ensuring stable system performance throughout the warranty period even under high system voltage.
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