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WINAICO Brand review

WST-500BKX54-D3

500 Wp Back Contact Bifacial
ComparePV verdict

Middle of its segment, heavy for its output

Rank 1,714 of 14,269
Compare panels Datasheet PDF
Power (Wp)
500
Weak · bottom 19%
Efficiency (%)
24.50
Typical · median 24.50%
Density (Wp/m²)
245.0
Typical · median 245.0
Temp (%/°C)
-0.260
Typical · median -0.260
Weight (kg)
25.0
Weak · 1.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The WINAICO WBC (Back Contact) series consists of solar modules where all electrical contacts of the cells are moved to the rear side of the structure, leaving the front surface completely free of busbars and metallic ribbons. The result is a uniform, aesthetic black surface with no visible wiring, making these panels a natural choice for projects where roof or facade design matters just as much as energy output. The use of n-type monocrystalline half-cells combined with back-contact architecture reduces optical and resistive losses, increasing the real energy yield from the same installed area. The bifacial, glass-glass construction further captures light reflected from the mounting surface, boosting overall system performance under varying irradiance conditions. Thanks to integrated bypass diodes, the panels handle partial shading more gracefully, limiting the power drops typical of conventional modules. The WBC series comes with a 30-year product warranty and linear power warranty, placing it among the most durable solutions on the market. It is a proposition aimed at premium investors and installers who expect a combination of high efficiency, aesthetics, and long-term reliability in a single module.

Ranking

36 panels in the segment Back Contact 500-550 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.50% 24.50% Typical 98
Power density 245.0 245.0 Typical 101
Temperature coefficient -0.260 -0.260 Typical 521
Weight per kWp 50.0 46.5 Weak · bottom 15% 3,353
Performance warranty 30 yrs 30 yrs Typical 31
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 3 caution
Not ideal for

Weight-limited structures.

Watch-outs
50.0 kg per kWp

Bottom 15% of the Back Contact 500-550 W segment, against a median of 46.5.

What owners get
Highest efficiency in the back-contact segment

At 24-24.7% efficiency, the WBC series clearly outperforms comparable back-contact modules: AE Solar AURORA MD-132 (21.29%), Sunova Tangra M Pro HD (22.7%), and Hiwatt HW-M12/100H (21%), all at the same 505 Wp maximum power. A lead of up to 3.4 percentage points means a smaller installed area is needed to reach the same system power.

Clean aesthetics with no visible grid lines

Moving all cell electrical contacts to the rear eliminates visible busbars and front-side metallization grid, yielding a uniform black surface. This is a genuine advantage for projects where facade or roof appearance matters as much as energy output.

Bifacial glass-glass construction

The glass-glass bifacial design captures light reflected off the mounting surface, boosting total energy yield, particularly on reflective ground surfaces and under variable irradiance conditions.

30-year product and linear power warranty

A full 30-year product warranty combined with a 30-year linear power warranty is among the longest coverage periods available in the PV market, exceeding the standard 25-year power warranties offered by many tier-1 manufacturers.

Tier-1 manufacturer with 20+ years in the market

WINAICO has operated since 2003 and holds tier-1 bankable status, improving project bankability and easing financing approval from banks and investment funds that require documented manufacturer stability.

Trade-offs
Limited field track record for back-contact tech

The WBC series launched in 2025, and back-contact modules as a category are still relatively young in mass production compared to established PERC and TOPCon technologies. This means less multi-year operational data from reference installations than for older cell architectures.

Likely price premium over standard TOPCon modules

Back-contact technology requires a more complex cell manufacturing process than standard half-cut PERC/TOPCon, which in the industry typically translates into a higher price per Wp. This can extend payback time compared to cheaper bifacial TOPCon modules of similar power.

Notes from the database
  • At 24.5% efficiency, this panel is on par with typical Back Contact 500-550W modules
  • At 244.9 W/m² power density, roof space requirements are typical for Back Contact 500-550W panels
  • Temperature coefficient of -0.26%/°C matches the Back Contact 500-550W median
  • Weight of 25.0 kg is 1.5 kg above Back Contact 500-550W median (23.5 kg) - verify structural support
  • In the top 1% for efficiency among all Back Contact panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 500 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.50 % Typical Segment median 24.50%
Vmpp · Impp 33.97 V · 14.72 A Operating point at max power
Voc · Isc 40.77 V · 15.48 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 Weak Weak · 1.5 kg above median
Cells 108 · Back Contact Monocrystalline
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 444 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 500 Wp appear here. The rest cover the whole series.

Current-Voltage (I-V) characteristic curves at varying irradiance, 25°C cell temperature Current-Voltage (I-V) characteristic curves at varying irradiance, 25°C cell temperature 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
-

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
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
WINAICO WST-500BKX54-D3 500 W 24.50% -0.260 25.0 kg You are here
JKM510T-48HL6M-DB 510 W 25.52% -0.240 22.0 kg Cooler, lighter, +1.0 pp
JKM505T-48HL6M-DB 505 W 25.27% -0.240 22.0 kg Cooler, lighter, +0.8 pp
JKM500T-48HL6M-DB 500 W 25.02% -0.240 22.0 kg Cooler, lighter, +0.5 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +0.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Lighter, +0.3 pp
JKM495T-48HL6M-DB 495 W 24.77% -0.240 22.0 kg Cooler, lighter, +0.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg Very close match
SPR-BE54-HD505 505 W 24.70% -0.260 26.0 kg Heavier, +10 yr warranty
WST-475BDX54-A2 475 W 23.30% -0.260 25.0 kg -25 W, -1.2 pp
WST-480BDX54-B2 480 W 23.50% -0.260 25.0 kg -20 W, -1.0 pp
WST-485BDX54-A2 485 W 23.80% -0.260 25.0 kg -15 W, -0.7 pp
WST-490BDX54-A2 490 W 24.00% -0.260 25.0 kg -10 W, -0.5 pp
WST-495BKX54-B2 495 W 24.30% -0.260 25.0 kg Very close match

Found 229 panels of the same or similar size to this one, within ±10 mm. See them here Found 233 panels of the same or similar size to this one, within ±25 mm. See them here Found 1770 panels of the same or similar size to this one, within ±50 mm. See them here Found 4123 panels of the same or similar size to this one, within ±100 mm. See them here

About the WBC Back Contact 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 technology in WINAICO WBC panels and how does it differ from standard modules?
In Back Contact technology, all electrical contacts of the cells are moved to the rear side of the panel, so the front surface has no visible metal grid lines or busbars. In conventional modules, front-side busbars and finger lines shade part of the cell surface and limit energy yield. Eliminating these elements in WBC reduces optical and resistive losses, increasing actual energy output from the same mounting area.
Do WINAICO WBC bifacial panels actually produce more energy?
Yes, the bifacial glass-glass construction allows the WBC panel to capture light reflected from the ground, roof, or a light-colored facade, not just direct sunlight hitting the front. In practice this means additional energy gain, especially when installed over light-colored surfaces, ground-mounted systems, or facades, where reflected light matters more than on a typical pitched roof.
What is the maximum power output of the WINAICO WBC panel and who is it designed for?
WBC series modules reach up to 505 Wp thanks to monocrystalline n-type half-cells. This high unit power combined with the clean, uniformly black surface free of visible wiring makes the panels especially appealing for projects where roof or facade design matters as much as energy efficiency, such as premium buildings or commercial properties.
What warranty comes with WINAICO WBC panels, and is it competitive?
The WBC series carries a 30-year product warranty and a 30-year linear power warranty. This is significantly longer than the industry standard of around 10-12 years for product warranties and 25 years for power warranties offered by most manufacturers. This extended coverage places WBC among the most durable solutions on the market and reflects the manufacturer's confidence in its back-contact cells and glass-glass construction.
Do WINAICO WBC panels handle partial shading well, for example from chimneys or trees?
Yes, the bypass diodes built into WBC panels reduce the power losses that occur in conventional modules when part of the panel is shaded, for instance by a chimney, antenna, or tree branches. This prevents the entire cell string from being blocked by the shaded section, helping maintain higher energy production even under variable sunlight conditions throughout the day.
Is WINAICO a reliable manufacturer, and where are WBC series panels produced?
WINAICO is a tier 1 manufacturer headquartered in Taiwan with a long track record in the premium PV module market. Tier 1 status means the company appears on the list of the most bankable PV manufacturers, which simplifies project financing and increases confidence in the warranty provider's long-term financial stability. This is a key factor for investors and installers seeking long-term reliability, particularly given the 30-year warranty.
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