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WINAICO Brand review

WST-665BKX72-A2

665 Wp Back Contact Bifacial 40%
ComparePV verdict

Solid all-round for its segment

Rank 407 of 14,129
Compare panels Datasheet PDF
Power (Wp)
665
Typical for its class
Efficiency (%)
24.60
Typical · median 24.40%
Density (Wp/m²)
246.2
Typical · median 244.3
Temp (%/°C)
-0.260
Typical · median -0.260
Weight (kg)
32.1
Typical · median 32.8 kg
Warranty (yrs)
30
Typical · median 30 yrs

The WST-BKX72-A2 WBC Back Contact series is WINAICO's flagship utility-class solution, engineered for large-scale ground-mount installations and solar farms where every watt per square meter matters. The modules use back contact technology with N-type monocrystalline cells, meaning the front side of the module has no visible busbars or metallization grid - resulting in a cleaner appearance and reduced optical losses. An additional advantage is the bifacial glass-glass construction, which captures extra energy from reflected light hitting the rear side of the panel, meaningfully lowering the cost of energy in terms of LCOE. The series also stands out for its high module efficiency reaching 25%, which means fewer panels are needed to hit a target system capacity and lower BoS costs. Investors will appreciate the low power degradation in the first year and throughout subsequent years of operation, backed by a long-term product warranty and a linear performance guarantee. This makes it a strong choice for developers of commercial and industrial projects who demand high reliability, durability, and maximum return on investment from every square meter of roof or land.

Ranking

88 panels in the segment Back Contact 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 24.60% 24.40% Typical 58
Power density 246.2 244.3 Typical 47
Temperature coefficient -0.260 -0.260 Typical 515
Weight per kWp 48.3 49.8 Typical 2,141
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 0 caution
Best for

Utility-scale and commercial.

Notes from the database
  • At 24.6% efficiency, this panel is on par with typical Back Contact 650-700W modules
  • At 246.2 W/m² power density, roof space requirements are typical for Back Contact 650-700W panels
  • At -0.26%/°C, hot weather performance is typical for Back Contact 650-700W panels
  • 40% bifaciality enables rear-side power generation, boosting yield by 2-6% on reflective surfaces
  • #58 for efficiency, #515 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 665 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 24.60 % Typical Segment median 24.40%
Vmpp · Impp 45.60 V · 14.59 A Operating point at max power
Voc · Isc 54.30 V · 15.55 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.1 kg Typical Typical · median 32.8 kg
Cells 144 · 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 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 88.8 % Equals 591 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 665 Wp appear here. The rest cover the whole series.

WINAICO Performance Guarantee – Yearly degradation from 2nd to 30th year WINAICO Performance Guarantee – Yearly degradation from 2nd to 30th year 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-665BKX72-A2 665 W 24.60% -0.260 32.1 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg -15 W, lighter, +0.6 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +15 W, lighter, +0.6 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +10 W, lighter, +0.4 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg -20 W, lighter, +0.4 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +35 W, heavier, +0.4 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +10 W, +0.4 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +30 W, heavier, +0.3 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Lighter
WST-625NHX66-A4 625 W 23.10% -0.240 32.6 kg -40 W, cooler, -1.5 pp
WST-630NHX66-A4 630 W 23.30% -0.240 32.6 kg -35 W, cooler, -1.3 pp
WST-670BKX72-A2 670 W 24.80% -0.260 32.1 kg Very close match
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Lighter
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg Very close match

Found 1144 panels of the same or similar size to this one, within ±10 mm. See them here Found 1150 panels of the same or similar size to this one, within ±25 mm. See them here Found 1261 panels of the same or similar size to this one, within ±50 mm. See them here Found 1942 panels of the same or similar size to this one, within ±100 mm. See them here

About the WST-BKX72-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 technology in the WINAICO WST-BKX72-A2 panels and how does it differ from conventional panels?
Back contact means all cell interconnections, including busbars, are placed on the rear side of the module instead of the front, as in conventional panels. This gives the front surface a uniform black appearance without visible metallization grids, reducing optical losses and improving aesthetics. In practice, this results in higher energy conversion efficiency compared to traditional PERC monocrystalline cells.
Do WST-BKX72-A2 WBC bifacial panels actually produce extra energy in real conditions?
Yes, the glass-glass construction allows the panel to capture light reflected off the ground on its rear side as well, yielding an additional energy gain of several to over a dozen percent depending on ground albedo and mounting height. In ground-mounted installations with light-colored surfaces, such as gravel or white membrane, the bifacial effect is especially noticeable and meaningfully lowers the cost of energy measured as LCOE.
What is the maximum power output of the WST-BKX72-A2 WBC series, and how many panels are needed for a typical utility-scale PV plant?
The flagship model in this series reaches a maximum power output of 675 Wp with a module efficiency of up to 25 percent. This high per-unit power means fewer panels are required to reach a given installed capacity compared to lower-efficiency modules, which reduces mounting structure, cabling, and labor costs, known collectively as BoS costs.
What warranty applies to the WINAICO WST-BKX72-A2 WBC panels, and is it reliable?
The manufacturer provides a 15-year product warranty along with a 30-year linear performance warranty, which is above the market average. WINAICO is a Taiwan-based Tier 1 manufacturer with over a decade in the market, which increases confidence that warranty commitments will be honored throughout the system's operating life.
Is the WST-BKX72-A2 WBC series better suited for large solar farms or residential rooftop installations?
This series was designed for large ground-mounted installations and utility-scale solar farms rather than typical residential rooftop systems. Its larger module dimensions and high per-unit power rating of 675 Wp work best in commercial and industrial projects, where maximizing power output per square meter of land is the priority.
Are WINAICO back contact panels more prone to microcracks or failures than conventional PERC panels?
No, back contact technology does not increase the risk of microcracks or failures - on the contrary, the absence of front-side busbars combined with the glass-glass construction improves mechanical rigidity and durability. This design also better protects the cells from moisture and corrosion, supporting the low first-year power degradation and the low degradation rates seen in subsequent years of operation.
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