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WINAICO Brand review

WST-505BKX54-A2

505 Wp Back Contact Bifacial 40%
ComparePV verdict

Efficiency leader, no clear weak spot

Rank 1,485 of 14,129
Compare panels Datasheet PDF
Power (Wp)
505
Strong · top 17%
Efficiency (%)
24.70
Strong · top 1%
Density (Wp/m²)
247.4
Strong · top 1%
Temp (%/°C)
-0.260
Typical · median -0.260
Weight (kg)
25.0
Typical · median 23.3 kg
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

272 panels in the segment Back Contact 405-605 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 0 caution
Best for

Residential and commercial.

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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 505 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.70 % Strong Segment median 23.30%
Vmpp · Impp 35.64 V · 14.18 A Operating point at max power
Voc · Isc 40.94 V · 15.28 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 23.3 kg
Cells 108 · Back Contact Monocrystalline
Bifaciality 40 % 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 88.8 % Equals 449 W guaranteed
Degradation 1.00 → 0.35 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by WINAICO in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 505 Wp appear here. The rest cover the whole series.

Yearly degradation from 2nd to 30th year (WINAICO Performance Guarantee) Yearly degradation from 2nd to 30th year (WINAICO Performance Guarantee) Whole series Characteristic Curves (Current-Voltage, various irradiance levels) Characteristic Curves (Current-Voltage, various irradiance levels) Whole series

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-505BKX54-A2 505 W 24.70% -0.260 25.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +0.3 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg -10 W, lighter
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +50 W
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg -15 W, lighter
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter
WST-475BDX54-A2 475 W 23.30% -0.260 25.0 kg -30 W, -1.4 pp
WST-480BDX54-B2 480 W 23.50% -0.260 25.0 kg -25 W, -1.2 pp
WST-485BDX54-A2 485 W 23.80% -0.260 25.0 kg -20 W, -0.9 pp
WST-490BDX54-A2 490 W 24.00% -0.260 25.0 kg -15 W, -0.7 pp
WST-495BKX54-B2 495 W 24.30% -0.260 25.0 kg -10 W, -0.4 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Lighter

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-A2 WBC Series series

6 answered

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

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.
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