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WINAICO Brand review

WST-400MGX-P3 Full Black

400 Wp Monocrystalline
ComparePV verdict

Middle of its segment, short guarantee

Rank 10,812 of 14,129
Compare panels Datasheet PDF
Power (Wp)
400
Weak · bottom 25%
Efficiency (%)
20.44
Typical · median 21.30%
Density (Wp/m²)
204.4
Typical · median 212.5
Temp (%/°C)
-0.350
Weak · bottom 24%
Weight (kg)
21.5
Typical · median 22.5 kg
Warranty (yrs)
25
Weak · bottom 19%

The WINAICO WST-MGX-P3 GEMINI series consists of monocrystalline modules built on half-cut cells connected in a multi-busbar design with reflective wire, which reduces current losses and boosts energy yield even under partial shading or minor cell microcracks. This architecture lets the panels perform better in demanding installation conditions - on roofs with complex geometry, or under light shading from chimneys or antennas - where conventional modules lose considerably more power. GEMINI targets private investors and installers who prioritize the long-term durability of their system rather than just the lowest price per watt. Every single module undergoes a complete, 100 percent quality inspection that eliminates microcracks and soldering defects at the production stage, resulting in consistent parameters and a lower risk of warranty claims throughout the system's service life. A robust aluminum frame provides strong resistance to snow and wind loads, a benefit installers working in harsh climates will appreciate. The manufacturer backs the series with a 25-year linear performance warranty and minimal annual degradation, which has a real impact on lowering the LCOE of the installation over its entire lifetime. It's a solution for anyone looking for a balance between proven silicon technology and genuine investment security.

Ranking

6,577 panels in the 300-500 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.44% 21.30% Typical 11,632
Power density 204.4 212.5 Typical 11,624
Temperature coefficient -0.350 -0.300 Weak · bottom 24% 10,489
Weight per kWp 53.8 53.2 Typical 7,849
Performance warranty 25 yrs 30 yrs Weak · bottom 19% 9,912
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 2 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Owners who want a long output guarantee and hot climates.

Watch-outs
25 year performance warranty

Bottom 19% of the 300-500 W band, against a median of 30 yrs.

-0.350 %/°C temperature coefficient

Bottom 24% of the 300-500 W band, against a median of -0.300.

Notes from the database
  • Module efficiency of 20.4% is 1.4pp below average for database panels (median: 21.8%)
  • 204.4 W/m² power density is 13.7 W/m² below database median (218.1 W/m²) - requires larger installation area
  • -0.35%/°C temperature coefficient - 0.05pp worse than database median (-0.30%/°C), expect higher hot weather losses
  • At 21.5 kg, this panel is 5.0 kg lighter than database median (26.5 kg) - easier handling during installation
  • In the top 82% for efficiency among all N-type panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 400 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 20.44 % Typical Segment median 21.30%
Vmpp · Impp 30.71 V · 13.04 A Operating point at max power
Voc · Isc 37.29 V · 13.69 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1724×1135×35 mm · 1.96 m² of roof
Weight 21.5 kg Typical Typical · median 22.5 kg
Cells 108 Monocrystalline
Coefficient Pmax -0.350 %/°C Weak bottom 24% of its segment
Coefficient Voc · Isc -0.280 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 25 years Weak bottom 19% · median 30 yrs
End-of-warranty output 85.3 % Equals 331 W guaranteed
Degradation 2.00 → 0.53 % 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
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.350 %/°C against a segment median of -0.300
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
WINAICO WST-400MGX-P3 Full Black 400 W 20.44% -0.350 21.5 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg Cooler, +2.6 pp, +5 yr warranty
JST-EDMH-(445-465)W-TD (450W class) 450 W 23.05% -0.300 20.5 kg +50 W, +2.6 pp, +5 yr warranty
QNN182-HG450-54 450 W 23.04% -0.290 24.0 kg +50 W, cooler, +2.6 pp
HY440-N108BDD 450 W 23.04% -0.300 23.5 kg +50 W, +2.6 pp, +5 yr warranty
NLBK-27-450 450 W 23.04% -0.300 22.9 kg +50 W, +2.6 pp, +5 yr warranty
RS41-450NBG-E3 450 W 23.04% -0.290 24.5 kg +50 W, cooler, +2.6 pp
WST-405MGX-E5 405 W 20.80% -0.320 21.7 kg Cooler, +0.4 pp
WST-410MGX-P3 410 W 20.95% -0.350 21.5 kg +10 W, +0.5 pp
WST-410MGX-E3 410 W 21.00% -0.340 21.6 kg +10 W, +0.6 pp
WST-415MGX-E3 415 W 21.30% -0.340 21.6 kg +15 W, +0.9 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +110 W, cooler, +4.6 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +95 W, cooler, +4.4 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +105 W, cooler, +4.3 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +105 W, cooler, +4.3 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +90 W, cooler, +4.1 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +100 W, cooler, +4.1 pp

Found 1797 panels of the same or similar size to this one, within ±10 mm. See them here Found 1931 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-P3 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 maximum power output of WINAICO WST-MGX-P3 GEMINI panels?
The WST-MGX-P3 GEMINI series reaches a maximum power output of up to 410 Wp. This is achieved through monocrystalline half-cut cells arranged in a multi-busbar configuration with a reflective interconnect wire, which reduces current losses and increases energy yield compared to classic full-cell modules of similar size.
How does GEMINI's half-cut cell technology differ from standard cells?
In half-cut technology, each silicon cell is cut in half, which reduces resistive losses and limits the impact of micro-defects in individual cell fragments on the module's overall performance. The GEMINI series also uses a reflective interconnect wire between busbars that reuses light falling between cells, boosting energy yield especially under partial shading.
What is the warranty on WINAICO GEMINI panels?
The manufacturer offers a 25-year product warranty and a 25-year linear power performance warranty with minimal annual degradation. This means that even after a quarter-century of operation, the panel still delivers the defined share of its original power output, which meaningfully lowers the LCOE over the system's full lifetime.
Are GEMINI panels suitable for roofs with complex geometry, such as chimneys or antennas?
Yes, this is one of the series' main use cases. The half-cut cell configuration with a reflective interconnect wire limits power loss from partial shading cast by chimneys, antennas, or dormers, unlike classic modules that lose significantly more energy in such conditions. The durable aluminum frame also provides stability on structurally complex roofs.
Is WINAICO GEMINI a bifacial panel?
No, the WST-MGX-P3 GEMINI series is a monofacial module, generating energy only from the front side. Despite lacking bifacial technology, thanks to the half-cut cell architecture and 100 percent quality inspection during production, the modules deliver stable parameters and low claim risk throughout their service life.
Is WINAICO GEMINI worth choosing if price per watt is the main priority?
If the lowest purchase price per watt is the only priority, GEMINI may not be the first choice, since this Tier 1 Taiwanese manufacturer focuses on long-term durability and low power degradation rather than the lowest upfront cost. For investors calculating total energy cost over the 25-year warranty period, this series typically outperforms cheaper alternatives with weaker quality control.
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