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Sonnex Energie Brand review

SNX-D54HND-420M

420 Wp TOPCon Bifacial
ComparePV verdict

Middle of its segment, weak in heat

Rank 7,501 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.51
Weak · bottom 20%
Density (Wp/m²)
215.1
Weak · bottom 19%
Temp (%/°C)
-0.320
Weak · bottom 7%
Weight (kg)
24.5
Weak · 2.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Sonnex Energie NeX Series SNX-D54HND is a series of TOPCon N-type modules with a dual glass and bifacial design, specifically engineered for stable operation and higher energy yield throughout the year. The use of N-type cells means no LID (light-induced degradation) and better long-term performance, which translates to predictable energy production and reduced risk of disappointment after several seasons. The dual-glass construction also increases resistance to moisture, microcracks, and challenging mounting conditions, making this series well-suited for roofs exposed to loads and installations where durability is paramount.

Thanks to its bifacial design, the module can utilize reflected light from the ground - a practical advantage, especially on bright roofs, ground-mounted structures, and carports, where additional energy gain can be easily obtained without expanding the system. The NeX SNX-D54HND also features long warranties for glass-glass modules, which distinguishes it from many competing solutions that primarily focus on price.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.51% 22.00% Weak · bottom 20% 7,894
Power density 215.1 220.2 Weak · bottom 19% 7,882
Temperature coefficient -0.320 -0.290 Weak · bottom 7% 8,312
Weight per kWp 58.3 51.4 Weak · bottom 8% 11,670
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 · 3 caution
Best for

Residential and commercial.

Not ideal for

Hot climates, weight-limited structures and roofs where every square metre has to count.

Watch-outs
-0.320 %/°C temperature coefficient

Bottom 7% of the TOPCon 400-450 W segment, against a median of -0.290. Ranked 8,312th in the whole database.

58.3 kg per kWp

Bottom 8% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 11,670th in the whole database.

215.1 watts per square metre

Bottom 19% of the TOPCon 400-450 W segment, against a median of 220.2.

Notes from the database
  • Efficiency of 21.5% matches the TOPCon 400-450W median
  • Power density of 215.1 W/m² is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • At -0.32%/°C, loses 0.03pp more power per degree than TOPCon 400-450W median (-0.29%/°C)
  • At 24.5 kg (2.5 kg above TOPCon 400-450W median of 22.0 kg), requires checking roof load capacity
  • #7894 for efficiency, #8312 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.51 % Weak Segment median 22.00%
Vmpp · Impp 31.50 V · 13.34 A Operating point at max power
Voc · Isc 38.10 V · 14.07 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×30 mm · 1.95 m² of roof
Weight 24.5 kg Weak Weak · 2.5 kg above median
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.320 %/°C Weak bottom 7% of its segment
Coefficient Voc · Isc -0.260 · 0.046 %/°C
NOCT 42 °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 87.4 % Equals 367 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Sonnex Energie in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 420 Wp appear here. The rest cover the whole series.

Sonnex TOPCon Module Performance Warranty Sonnex TOPCon Module Performance Warranty 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 -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Sonnex Energie SNX-D54HND-420M 420 W 21.51% -0.320 24.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, lighter, +2.3 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.3 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.2 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, lighter, +2.1 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.1 pp
SNX-D54HND-415M 415 W 21.25% -0.320 24.5 kg -0.3 pp
SNX-D54HN***-M-S (425W) 425 W 21.80% -0.310 21.0 kg Cooler, lighter, +0.3 pp
SNX-D54HN***-M-S (430W) 430 W 22.00% -0.310 21.0 kg Cooler, lighter, +0.5 pp
SNX-D54HN***-M-S (435W) 435 W 22.30% -0.310 21.0 kg +15 W, lighter, +0.8 pp
SNX-D54HN***-M-S (440W) 440 W 22.50% -0.310 21.0 kg +20 W, lighter, +1.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +3.5 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.3 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.2 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.0 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.0 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What does the 30-year warranty on the Sonnex Energie NeX SNX-D54HND panels actually cover?
The NeX SNX-D54HND series comes with both a 30-year product warranty and a 30-year linear power warranty — one of the longest guarantees available in its class, made possible by the more durable dual glass construction. After 30 years of operation, the module is warranted to retain at least 87.4% of its nominal 435 W output. Most modules with standard polymer backsheets offer only 12–15 years of product warranty, making this series stand out significantly in terms of investment protection.
How does TOPCon N-type technology in the NeX series differ from common PERC cells, and does it matter in practice?
TOPCon N-type cells are not subject to LID (Light Induced Degradation), which typically causes PERC modules to lose 1–2% of power during the first weeks of operation. The NeX SNX-D54HND delivers its rated output from day one. Additionally, the temperature coefficient of −0.32%/°C means lower power losses on hot summer days compared to P-type cells. The result is more predictable energy production across all seasons.
Is the NeX SNX-D54HND suitable for pitched roof installation, and is its weight a concern?
Yes, the module is compatible with standard racking systems used on pitched roofs. Its 1722×1134×30 mm dimensions are typical for panels in this power class. At approximately 24.5 kg, it is slightly heavier than standard backsheet modules (around 20–22 kg), so it is worth verifying roof load capacity during the design phase. For most well-built residential roofs this is not a limiting factor, but it should be included in the structural assessment.
How much extra energy can the bifacial rear side of the SNX-D54HND realistically generate, and when does it pay off?
Real-world bifacial gain depends on surface albedo and mounting height. On light or white roof surfaces, gravel ballast, and ground-mounted systems you can expect 5–15% additional yield from the rear side. On dark rooftops the gain is minimal. The best conditions for bifacial production are ground mounts and carports where the module sits above a reflective surface — exactly the applications for which the NeX SNX-D54HND series is particularly well suited.
How do the NeX SNX-D54HND modules perform in winter and under low-irradiance conditions?
PV modules perform more efficiently in cool temperatures than in summer heat — lower cell temperature raises open-circuit voltage and instantaneous output. TOPCon technology with a temperature coefficient of −0.32%/°C also maintains strong performance under diffuse irradiance and overcast skies, which are common during Central European autumn and winter months. This results in a more consistent annual energy yield profile compared to older-generation modules.
Does the dual glass construction of the SNX-D54HND improve durability, and are there any drawbacks?
Yes — replacing the polymer backsheet with a second glass layer eliminates the primary moisture ingress path into the laminate, reducing the risk of cell corrosion and micro-cracking under mechanical stress. Dual glass modules handle demanding installation environments and heavy snow or wind loads better than standard backsheet panels. The trade-offs are slightly higher weight and a higher upfront cost, both of which are offset by the extended service life and 30-year product warranty.
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