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Trina Solar TSM-425NEG9R.28
Trina Solar Brand review

TSM-425NEG9R.28

425 Wp TOPCon Bifacial
ComparePV verdict

Middle of its segment, modest efficiency

Rank 8,592 of 14,005
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.30
Weak · bottom 13%
Density (Wp/m²)
212.7
Weak · bottom 13%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
21.0
Typical · median 22.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Vertex S+ N-type i-TOPCon Dual Glass series is a breakthrough in rooftop module technology, combining compact dimensions with unprecedented durability. The use of N-type cells and innovative i-TOPCon architecture allows for higher efficiency and significantly slower degradation over time, which translates into real energy gains for decades. A key differentiator is the dual glass layer, which replaces the traditional backsheet film. This design not only increases resistance to atmospheric factors such as salt, ammonia, or sand, but also completely eliminates the problem of micro-cracks and corrosion. These modules solve the problem of limited roof space, delivering more power from every square meter while maintaining a low weight. i-TOPCon technology guarantees excellent performance even on cloudy days, which is crucial in the Polish climate. It is an ideal choice for investors looking for the highest standard of fire safety and a 30-year power warranty. Vertex S+ distinguishes itself from the competition with a unique combination of aesthetics and extreme mechanical strength, making it the best investment for modern single-family houses and demanding prosumer installations. By choosing this model, you gain the certainty that your installation will remain efficient for generations thanks to low annual degradation and a reinforced structure resistant to harsh environmental conditions.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.30% 22.00% Weak · bottom 13% 8,519
Power density 212.7 220.2 Weak · bottom 13% 8,733
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 49.4 51.4 Typical 2,909
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 · 2 caution
Best for

Residential and commercial.

Not ideal for

Tight roof space and roofs where every square metre has to count.

Watch-outs
21.30% module efficiency

Bottom 13% of the TOPCon 400-450 W segment, against a median of 22.00%.

212.7 watts per square metre

Bottom 13% of the TOPCon 400-450 W segment, against a median of 220.2.

Notes from the database
  • Efficiency of 21.3% is 0.7pp below the TOPCon 400-450W median (22.0%)
  • At 212.7 W/m², this panel generates 7.5 W/m² less per unit area than TOPCon 400-450W median (220.2 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • Weight of 21.0 kg is typical for TOPCon 400-450W panels
  • #8519 for efficiency, #2165 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.30 % Weak Segment median 22.00%
Vmpp · Impp 42.90 V · 9.92 A Operating point at max power
Voc · Isc 50.90 V · 10.56 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1762×1134×30 mm · 2.00 m² of roof
Weight 21.0 kg Typical Typical · median 22.0 kg
Cells 144 · TOPCon Monocrystalline
Coefficient Pmax -0.290 %/°C Typical median -0.290 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 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 371 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
-0.290 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Trina Solar TSM-425NEG9R.28 425 W 21.30% -0.290 21.0 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +50 W, +2.7 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, hotter, +2.5 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, cooler, +2.5 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, heavier, +2.5 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, heavier, +2.5 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +2.5 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +2.5 pp
TSM-DE09R.05-405 405 W 20.30% -0.340 21.8 kg Hotter, -1.0 pp, -5 yr warranty
TSM-DE09R.05-410 410 W 20.50% -0.340 21.8 kg Hotter, -0.8 pp, -5 yr warranty
TSM-DE09R-415 415 W 20.80% -0.340 21.8 kg Hotter, -0.5 pp, -5 yr warranty
TSM-DE09R.08-420 420 W 21.00% -0.340 21.8 kg Hotter, -0.3 pp, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, cooler, +3.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, cooler, +3.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +80 W, cooler, +3.4 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +65 W, cooler, +3.2 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +75 W, cooler, +3.2 pp

Found 1395 panels of the same or similar size to this one, within ±10 mm. See them here Found 1425 panels of the same or similar size to this one, within ±25 mm. See them here Found 3614 panels of the same or similar size to this one, within ±50 mm. See them here Found 3962 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Are Trina Vertex S+ N-type i-TOPCon panels suitable for a sloped residential roof?
Yes, the Vertex S+ series is designed for residential rooftop installations. The compact module dimensions (approx. 1762×1134 mm) and weight of about 21 kg make handling and installation on standard rafter roofs easier. 144 half-cut cells improve shading tolerance, which matters on roofs with chimneys, dormers, or antennas.
How does i-TOPCon technology differ from conventional PERC cells?
N-type i-TOPCon cells achieve higher efficiency (up to about 22.8%) and are much less prone to LID and LeTID degradation than P-type PERC cells. This results in a lower annual power loss of 0.4% after the first year, delivering higher long-term energy yield, especially 15-20 years into the panel's service life.
What does bifacial design offer on the Vertex S+, and is it worth the extra cost?
Bifacial construction lets the module capture light reflected off the surface behind it, which can boost energy yield by several to over ten percent on light-colored roofs, ground, or elevated racking. On a standard dark roof-tile mount the gain is smaller, but the dual-glass design still allows some rear-side light transmission.
What warranty applies to Trina Vertex S+ modules, and how much power remains after 30 years?
The manufacturer provides a 25-year product warranty and a 30-year power output warranty. Degradation is capped at 1% in year one, then 0.4% annually, meaning the panel should still deliver roughly 87.4% of its rated power after 30 years — among the best figures in the residential rooftop segment.
Do Vertex S+ panels perform well on cloudy days, typical of the Polish climate?
Yes, N-type i-TOPCon cells respond better to weak and diffuse light than conventional PERC cells, so the system generates power more efficiently under low-irradiance conditions. A lower power temperature coefficient also limits output losses on hot days, making the series well suited to Poland's variable weather.
How does dual-glass construction differ from a standard backsheet, and what are the benefits?
Instead of a standard backsheet film, the module uses a second layer of tempered glass, eliminating the risk of microcracks, corrosion, and moisture-, salt-, or ammonia-related degradation. This construction also improves PID resistance and extends real-world service life, though it adds slightly more weight than backsheet versions.
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