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Sonnex Energie Brand review

SNX-D54HN***-M-S (420W)

420 Wp TOPCon
ComparePV verdict

Middle of its segment, weak in heat

Rank 9,459 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 16%
Efficiency (%)
21.50
Weak · bottom 17%
Density (Wp/m²)
215.1
Weak · bottom 19%
Temp (%/°C)
-0.310
Weak · bottom 10%
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Sonnex Energie 54 Series TOPCon Smart Module (Smart Series: SNX-D54HN(S)) combines N-type cells using the TOPCon technology with integrated smart electronics within the module, effectively improving performance in situations where traditional panels struggle. A key advantage is optimization at the string level, which minimizes losses due to shading (e.g., from chimneys, skylights, or trees) and stabilizes the system's operation throughout the day. The module also supports cell-string monitoring, which facilitates quick diagnostics of production declines without guesswork. From a safety perspective, temperature detection and a rapid shutdown (RSD) function are crucial, limiting the risk of hot spots and simplifying maintenance. Another advantage is compatibility with third-party inverters and the absence of the need for external optimizers - this reduces the number of connections and potential mounting errors. This is a good choice for roofs of houses, small businesses, and installations with varying orientations, where predictable performance and module control are essential.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.50% 22.00% Weak · bottom 17% 7,958
Power density 215.1 220.2 Weak · bottom 19% 7,882
Temperature coefficient -0.310 -0.290 Weak · bottom 10% 8,005
Weight per kWp 50.0 51.4 Typical 3,317
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, commercial and shaded-installations.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.310 %/°C temperature coefficient

Bottom 10% of the TOPCon 400-450 W segment, against a median of -0.290.

21.50% module efficiency

Bottom 17% of the TOPCon 400-450 W segment, against a median of 22.00%.

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
  • At 21.5% efficiency, this panel is on par with typical TOPCon 400-450W modules
  • 215.1 W/m² power density is 5.1 W/m² below TOPCon 400-450W median (220.2 W/m²) - requires larger installation area
  • At -0.31%/°C, loses 0.02pp more power per degree than TOPCon 400-450W median (-0.29%/°C)
  • Weight of 21.0 kg is typical for TOPCon 400-450W panels
  • In the top 57% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.50 % Weak Segment median 22.00%
Vmpp · Impp 31.60 V · 13.30 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 21.0 kg Typical Typical · median 22.0 kg
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.310 %/°C Weak bottom 10% of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 20 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

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
-0.310 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Sonnex Energie SNX-D54HN***-M-S (420W) 420 W 21.50% -0.310 21.0 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +45 W, cooler, +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, cooler, +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 Hotter, heavier, -0.2 pp
SNX-D54HN***-M-S (425W) 425 W 21.80% -0.310 21.0 kg +0.3 pp
SNX-D54HN***-M-S (430W) 430 W 22.00% -0.310 21.0 kg +10 W, +0.5 pp
SNX-D54HN***-M-S (435W) 435 W 22.30% -0.310 21.0 kg +15 W, +0.8 pp
SNX-D54HN***-M-S (440W) 440 W 22.50% -0.310 21.0 kg +20 W, +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 warranty does the Sonnex Energie SNX-D54HN(S) Smart Series carry?
Sonnex Energie provides a 20-year product warranty and a 30-year power output warranty for the SNX-D54HN(S) series. The 30-year linear power guarantee is among the longest available in the prosumer PV market and covers the full expected payback period of a typical residential system. The low long-term degradation rate is enabled by N-type TOPCon cells, which show significantly less LID than legacy PERC technology.
Does the SNX-D54HN(S) handle partial shading better than a standard TOPCon module?
Yes. The Smart Module integrates cell-string-level optimization with three independent MPPT circuits built into each panel. When shade from a chimney, dormer, or nearby trees falls on the module, losses are contained to the affected cell strings while the rest of the module continues operating at full power. A conventional TOPCon or PERC panel without an optimizer can drag down the output of an entire string inverter under the same conditions.
Do SNX-D54HN(S) panels require a dedicated inverter or external MLPE optimizers?
No. The Smart Series has its optimizer electronics integrated directly into the module, eliminating the need for external MLPE devices and reducing the number of rooftop connections. The panels are compatible with standard string inverters from third-party manufacturers via RS485, so installers retain full flexibility in inverter selection without being locked into a proprietary ecosystem.
What is the rapid shutdown (RSD) function in the SNX-D54HN(S) and why does it matter?
The integrated RSD circuit drops module-level DC voltage to a safe level within seconds of a system shutdown command. Because it is built into the SNX-D54HN(S) module itself, no additional external shutdown devices need to be installed. This protects firefighters and service crews working on an energized roof and aligns with rapid shutdown requirements similar to NEC 2017 that are increasingly referenced in European electrical codes.
What is the peak power of the Sonnex Energie SNX-D54HN(S) and how many panels do I need for a 10 kWp system?
The module is rated at 440 Wp. A 10 kWp system requires only 23 of these panels, compared to 25-27 conventional 370-380 Wp PERC modules for the same target capacity. Fewer panels translate to less roof space used, fewer BoS connections, and a simpler installation while achieving the same system output.
Is the SNX-D54HN(S) suitable for installation on a pitched residential roof?
Yes. At 1722 x 1134 x 30 mm and approximately 21 kg, the module fits standard racking systems designed for pitched residential roofs. The built-in cell-string MPPT optimization makes it especially well-suited for roofs with uneven exposure or shading obstacles — conditions common on single-family homes with chimneys, skylights, or nearby vegetation — where a plain module would suffer disproportionate yield losses.
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