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WINAICO Brand review

WST-625NHX66-A4

625 Wp HJT Bifacial 90%
ComparePV verdict

Light for its output, no clear weak spot

Rank 1,893 of 14,129
Compare panels Datasheet PDF
Power (Wp)
625
Typical for its class
Efficiency (%)
23.10
Typical · median 22.60%
Density (Wp/m²)
231.4
Strong · top 25%
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
32.6
Strong · 1.0 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The WINAICO WST-NHX66-A4 series is engineered for utility-scale installations, where every kilowatt-hour produced over the project lifetime matters. At its core are cells built on heterojunction (HJT) technology, combining N-type monocrystalline silicon with a thin amorphous layer, giving the module better performance in high-temperature conditions than conventional PERC or TOPCon designs. The panel is fully bifacial, and its high bifaciality factor allows meaningful energy gains from light reflected off the ground surface, a particularly valuable trait for ground-mount arrays and tracker systems. Its glass-glass construction, with tempered glass on both sides, boosts mechanical durability and long-term resilience, reducing the risk of microcracks and laminate degradation. The series is also distinguished by very low power degradation across its operating lifetime, delivering stable energy output throughout the linear performance warranty period. It is built for investors and developers of solar farm projects who demand high reliability, predictable LCOE, and resistance to demanding climatic conditions.

Ranking

78 panels in the segment HJT 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.10% 22.60% Typical 1,617
Power density 231.4 226.0 Strong · top 25% 1,558
Temperature coefficient -0.240 -0.240 Typical 13
Weight per kWp 52.2 54.7 Strong · top 15% 5,666
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

Utility-scale.

Strengths
52.2 kg per kWp

Top 15% of the HJT 600-650 W segment, against a median of 54.7.

231.4 watts per square metre

Top 25% of the HJT 600-650 W segment, against a median of 226.0.

Notes from the database
  • Efficiency of 23.1% matches the HJT 600-650W median
  • 231.4 W/m² power density - 5.4 W/m² more than HJT 600-650W median (226.0 W/m²), more power per roof area
  • Temperature coefficient of -0.24%/°C matches the HJT 600-650W median
  • At 32.6 kg, weight matches the HJT 600-650W median
  • 90% bifaciality enables rear-side power generation, boosting yield by 4-14% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 625 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.10 % Typical Segment median 22.60%
Vmpp · Impp 41.14 V · 15.21 A Operating point at max power
Voc · Isc 49.25 V · 16.06 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 32.6 kg Strong Strong · 1.0 kg below median
Cells 132 · HJT Monocrystalline
Bifaciality 90 % Rear output as a share of front
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.220 · 0.040 %/°C
NOCT 44 °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 90.3 % Equals 564 W guaranteed
Degradation 1.00 → 0.30 % 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
-0.240 %/°C against a segment median of -0.240
-
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-625NHX66-A4 625 W 23.10% -0.240 32.6 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +25 W, lighter, +2.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +50 W, lighter, +1.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Hotter, lighter, +1.9 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg +50 W, hotter, +1.9 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +45 W, lighter, +1.7 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +45 W, lighter, +1.7 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Hotter, lighter, +1.7 pp
WST-630NHX66-A4 630 W 23.30% -0.240 32.6 kg Very close match
WST-665BKX72-A2 665 W 24.60% -0.260 32.1 kg +40 W, hotter, +1.5 pp
WST-670BKX72-A2 670 W 24.80% -0.260 32.1 kg +45 W, hotter, +1.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +55 W, lighter, +2.1 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +75 W, hotter, +1.9 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +70 W, hotter, +1.8 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +45 W, hotter, +1.7 pp

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-NHX66-A4 Series series

6 answered

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

How does HJT cell technology in WINAICO WST-NHX66-A4 panels differ from classic PERC or TOPCon cells?
HJT cells combine N-type monocrystalline silicon with a thin amorphous layer, resulting in a lower temperature coefficient than PERC or TOPCon. In practice, this means a smaller power drop during heat and higher energy yield in warm climates or on roofs with poor ventilation where modules heat up significantly.
Does the bifacial design of the WST-NHX66-A4 modules deliver a real energy gain on a typical PV plant?
Yes, the high bifaciality factor of this series lets the module capture light reflected from the ground, grass, or light-colored surfaces beneath it. The biggest gains come from ground-mount installations and trackers with elevated racking and bright ground cover, where additional rear-side generation can meaningfully increase the plant's annual energy yield.
What warranty comes with WINAICO WST-NHX66-A4 panels, and what does the linear power warranty cover?
The series carries a 15-year product warranty along with a 30-year linear power warranty. The linear warranty guarantees a slow, predictable year-over-year decline in module output, resulting in stable and forecastable energy yield across the entire financing period of a solar plant project.
Does the glass-glass construction of the WST-NHX66-A4 improve durability compared to a standard glass-foil panel?
Yes, tempered glass on both sides replaces the rear polymer backsheet, improving mechanical strength, reducing the risk of cell microcracks, and protecting against laminate degradation and moisture ingress. This helps the module better withstand snow loads, hail, and thermal cycling over the long-term operation of utility-scale installations.
What type of projects is the WINAICO WST-NHX66-A4 series, rated up to 630 Wp, best suited for?
The series is designed primarily for utility-scale installations, solar farms, and developer projects where low LCOE and long-term reliability are critical. The high module power of up to 630 Wp reduces the number of panels needed to reach a given plant capacity, lowering racking, cabling, and installation labor costs.
Is WINAICO, as a Taiwan-based manufacturer, a reliable supplier for large-scale solar projects?
WINAICO is a tier 1 manufacturer headquartered in Taiwan, meaning strong financial standing and decades of experience producing high-quality modules trusted by banks and investors when assessing project bankability. Tier 1 status increases confidence in the manufacturer's ability to honor long-term warranties and provide service support for utility-scale installations.
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