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WINAICO Brand review

WST-405MGXB-E5

405 Wp Monocrystalline
ComparePV verdict

Middle of its segment, short guarantee

Rank 10,491 of 14,129
Compare panels Datasheet PDF
Power (Wp)
405
Typical for its class
Efficiency (%)
20.80
Typical · median 21.30%
Density (Wp/m²)
207.4
Typical · median 212.8
Temp (%/°C)
-0.320
Typical · median -0.300
Weight (kg)
21.7
Typical · median 22.6 kg
Warranty (yrs)
25
Weak · bottom 18%

The WST-MGX-E5 GEMINI series from WINAICO is built for installers and investors looking for a genuinely versatile panel - equally at home on residential rooftops and in commercial-scale installations. The modules use monocrystalline half-cut cells arranged across six independent strings, reducing power loss under partial shading while improving the panel's mechanical resilience. The Full Black version alongside the standard white-backsheet variant gives flexibility in aesthetics depending on the project and the investor's expectations. The panels stand out thanks to a robust build - a black anodized aluminum frame, 3.2 mm glass, and Staubli MC4-EVO2 connectors paired with an IP68 junction box - translating into strong resistance to harsh climate conditions, including wind and snow loads. A key advantage is the 25-year product warranty and linear performance warranty, guaranteeing degradation of no more than 0.53% per year, which meaningfully lowers the levelized cost of energy (LCOE) over the system's lifetime. The modules are manufactured in the USA, an added argument for markets that favor domestically sourced components and strict UL certification compliance. It's a solution for anyone who values durability, aesthetics, and predictable long-term performance.

Ranking

6,727 panels in the 305-505 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.80% 21.30% Typical 10,533
Power density 207.4 212.8 Typical 10,702
Temperature coefficient -0.320 -0.300 Typical 8,376
Weight per kWp 53.6 53.2 Typical 7,668
Performance warranty 25 yrs 30 yrs Weak · bottom 18% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 1 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Owners who want a long output guarantee.

Watch-outs
25 year performance warranty

Bottom 18% of the 305-505 W band, against a median of 30 yrs.

Notes from the database
  • At 20.8% efficiency, this panel is 1.0pp below the database median of 21.8%
  • Power density of 207.4 W/m² is 10.7 W/m² below database median (218.1 W/m²) - needs more roof space
  • -0.32%/°C temperature coefficient - 0.02pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • 21.7 kg weight - 4.8 kg lighter than database median (26.5 kg), reducing installation effort
  • #10533 for efficiency, #8376 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 405 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.80 % Typical Segment median 21.30%
Vmpp · Impp 31.36 V · 12.92 A Operating point at max power
Voc · Isc 37.36 V · 13.78 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×35 mm · 1.95 m² of roof
Weight 21.7 kg Typical Typical · median 22.6 kg
Cells 108 Monocrystalline
Coefficient Pmax -0.320 %/°C Typical median -0.300 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 25 years Weak bottom 18% · median 30 yrs
End-of-warranty output 85.3 % Equals 335 W guaranteed
Degradation 2.00 → 0.53 % 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 405 Wp appear here. The rest cover the whole series.

Winaico Performance Guarantee Winaico Performance Guarantee 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
-0.320 %/°C against a segment median of -0.300
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
WINAICO WST-405MGXB-E5 405 W 20.80% -0.320 21.7 kg You are here
AIKO-455-MAH54Db 455 W 23.30% -0.260 24.0 kg +50 W, cooler, +2.5 pp
LR5-54HTH-455M 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +2.5 pp
YL455CF54 e/2 455 W 23.30% -0.290 20.3 kg +50 W, +2.5 pp, +5 yr warranty
ESM-455T 455 W 23.30% -0.310 21.0 kg +50 W, +2.5 pp, +5 yr warranty
SE5-54HBC-455W 455 W 23.30% -0.290 20.8 kg +50 W, cooler, +2.5 pp
JST-EDMH-(445-465)W-TD (455W class) 455 W 23.30% -0.300 20.5 kg +50 W, +2.5 pp, +5 yr warranty
LX-455M/182R-96+ GG 455 W 23.30% -0.260 23.5 kg +50 W, cooler, +2.5 pp
WST-400MGX-P3 Full Black 400 W 20.44% -0.350 21.5 kg Hotter, -0.4 pp
WST-410MGX-P3 410 W 20.95% -0.350 21.5 kg Hotter
WST-410MGX-E3 410 W 21.00% -0.340 21.6 kg Hotter
WST-415MGX-E3 415 W 21.30% -0.340 21.6 kg +10 W, hotter, +0.5 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +105 W, cooler, +4.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +90 W, cooler, +4.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +100 W, cooler, +3.9 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +100 W, cooler, +3.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +85 W, cooler, +3.7 pp

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1928 panels of the same or similar size to this one, within ±25 mm. See them here Found 3413 panels of the same or similar size to this one, within ±50 mm. See them here Found 4007 panels of the same or similar size to this one, within ±100 mm. See them here

About the WST-MGX-E5 GEMINI 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 warranty on WINAICO WST-MGX-E5 GEMINI solar panels?
The WST-MGX-E5 GEMINI series comes with a 25-year product warranty and a 25-year linear power warranty. WINAICO guarantees annual power degradation will not exceed 0.53%, ensuring stable, predictable energy output throughout the system's lifetime and a lower levelized cost of energy (LCOE).
How do half-cut cells in the GEMINI panels differ from standard full-cell modules?
GEMINI panels use monocrystalline half-cut cells arranged across six independent strings. This design reduces power losses from partial shading, such as from chimneys or trees, and lowers mechanical stress within the module, improving resistance to microcracks and extending overall service life.
Are the WST-MGX-E5 GEMINI panels bifacial?
No, the WST-MGX-E5 GEMINI series is a monofacial panel, optimized for typical pitched-roof and commercial installations where the extra yield from rear-side reflected light would offer no practical benefit.
Is the Full Black version of the GEMINI panel worth choosing for installations not visible from the street?
The Full Black variant is primarily an aesthetic choice, best suited for projects where roof or facade appearance matters to the investor. For less visible installations, the classic white-backsheet version works equally well, since both variants share identical electrical and mechanical specifications with no impact on performance or durability.
How well do the GEMINI panels handle snow and wind loads?
GEMINI modules feature a black anodized aluminum frame and 3.2 mm glass, providing high structural rigidity. Combined with Staubli MC4-EVO2 connectors and an IP68-rated junction box, the panels are built to withstand demanding climate conditions, including heavy snow and strong wind loads.
Are WINAICO GEMINI panels made in the USA, and does that matter for UL certification?
Yes, the WST-MGX-E5 GEMINI series is manufactured in the United States. For installers and investors in markets favoring locally sourced components and requiring compliance with US UL certification standards, this is a meaningful advantage when choosing a module supplier.
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