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Trina Solar TSM-NEG18R.28-475W
Trina Solar Brand review

TSM-NEG18R.28-475W

475 Wp TOPCon
ComparePV verdict

Middle of its segment, needs the roof space

Rank 8,934 of 14,129
Compare panels Datasheet PDF
Power (Wp)
475
Typical for its class
Efficiency (%)
21.40
Weak · bottom 5%
Density (Wp/m²)
213.6
Weak · bottom 4%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
23.5
Typical · median 24.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The Trina Solar Vertex S+ series are modules designed for rooftops, where yield, durability, and aesthetics are key factors. The key differentiator is the combination of n-type i-TOPCon cell technology with the dual-glass construction, which uses a second glass sheet instead of a traditional backsheet. This provides better protection against moisture and material aging, performing exceptionally well in more demanding environmental conditions. In practice, this means more stable performance over time and lower risk of degradation compared to older solutions.

The Vertex S+ addresses a common challenge for investors: achieving high yield from limited rooftop space without compromising on appearance. Available variants (including the version with enhanced black finish) offer modern, cohesive aesthetics for premium homes, while simultaneously maintaining installer-friendly parameters - compatibility with popular inverters and optimizers, along with a format that simplifies installation. This is an excellent choice for residential and small commercial installations where long-term quality and predictable energy yield are essential.

Ranking

1,096 panels in the segment TOPCon 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.40% 22.52% Weak · bottom 5% 8,388
Power density 213.6 225.2 Weak · bottom 4% 8,476
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 49.5 52.2 Typical 3,013
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, commercial, shaded-installations and hot-climate.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
213.6 watts per square metre

Bottom 4% of the TOPCon 450-500 W segment, against a median of 225.2. Ranked 8,476th in the whole database.

21.40% module efficiency

Bottom 5% of the TOPCon 450-500 W segment, against a median of 22.52%. Ranked 8,388th in the whole database.

Notes from the database
  • Module efficiency of 21.4% is 1.1pp below average for TOPCon 450-500W panels (median: 22.5%)
  • At 213.6 W/m², this panel generates 11.6 W/m² less per unit area than TOPCon 450-500W median (225.2 W/m²)
  • Temperature coefficient of -0.29%/°C matches the TOPCon 450-500W median
  • #8388 for efficiency, #2220 for temperature performance out of 14129 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 475 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.40 % Weak Segment median 22.52%
Vmpp · Impp 32.30 V · 14.72 A Operating point at max power
Voc · Isc 39.00 V · 15.68 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1961×1134×30 mm · 2.22 m² of roof
Weight 23.5 kg Typical Typical · median 24.0 kg
Cells 108 · 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 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 415 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-NEG18R.28-475W 475 W 21.40% -0.290 23.5 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +35 W, cooler, +3.6 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +3.4 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +30 W, cooler, +3.3 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +30 W, cooler, +3.3 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +3.1 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +25 W, cooler, +3.1 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +25 W, cooler, +3.1 pp
TSM-NEG18R.28-480 480 W 21.60% -0.290 23.5 kg +0.2 pp
TSM-NEG18R.25-485 485 W 21.80% -0.290 23.5 kg +10 W, +0.4 pp
TSM-NEG18RC.27-490 490 W 22.00% -0.290 23.5 kg +15 W, +0.6 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +85 W, cooler, +3.4 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +80 W, cooler, +3.2 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +75 W, lighter, +3.0 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg +65 W, cooler, +3.0 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg +65 W, cooler, +3.0 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +70 W, heavier, +2.9 pp

Found 471 panels of the same or similar size to this one, within ±10 mm. See them here Found 508 panels of the same or similar size to this one, within ±25 mm. See them here Found 662 panels of the same or similar size to this one, within ±50 mm. See them here Found 1476 panels of the same or similar size to this one, within ±100 mm. See them here

About the Vertex S+ series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

What is n-type i-TOPCon cell technology in Trina Solar Vertex S+ panels and how does it differ from standard p-type cells?
i-TOPCon is an n-type cell technology that reduces light-induced degradation (LID) and temperature-related losses compared to more common p-type cells. In practice this means higher initial efficiency, a slower power decline over time, and better performance on hot rooftops in summer. For homeowners, this translates into higher real-world energy yield across the panel's 30-year service life.
How many Trina Solar Vertex S+ 510 Wp panels are needed for a 6 kW residential system?
With a unit power of 510 Wp, a roughly 6 kW system requires about 11-12 panels, covering approximately 22-24 m² of roof space. That's a real space saving compared to older, less efficient modules, where the same output often required several extra panels. The exact number depends on roof pitch, orientation, and local solar irradiance.
What warranty comes with Trina Solar Vertex S+ panels and what does it cover?
The manufacturer provides a 25-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means that even after 30 years, the module should still deliver a guaranteed, high percentage of its original power. As a Tier 1 manufacturer with a long track record, Trina Solar adds extra confidence that these warranty claims will actually be honored.
How does the dual-glass construction in Vertex S+ differ from a standard backsheet panel, and is it worth the cost?
Instead of a polymer backsheet, the panel uses a second glass layer on the back side, offering better protection against moisture, microcracks, and material aging, especially in harsher climates. Purchase cost is only slightly higher than a backsheet version, but it translates into greater durability and lower failure risk over decades of operation, supporting the 30-year power warranty.
Are Trina Solar Vertex S+ panels bifacial, generating extra energy from the rear side?
No, this Vertex S+ configuration is a monofacial module despite its dual-glass construction. The second glass layer serves a protective function rather than capturing reflected light for extra generation. This is a deliberate design choice by the manufacturer, balancing aesthetics and universal compatibility with sloped roof installations, where bifacial gains would be minimal anyway.
Is Trina Solar a reliable, trustworthy manufacturer for residential solar panels?
Yes, Trina Solar is a China-based manufacturer classified as Tier 1, meaning it has a solid financial standing, in-house production lines, and a long track record of module deliveries worldwide. This status matters practically when filing warranty claims years later - Tier 1 status lowers the risk that the manufacturer disappears from the market and leaves the warranty unenforceable.
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