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Trina Solar TSM-420NEG9RC.27
Trina Solar Brand review

TSM-420NEG9RC.27

420 Wp Monocrystalline Bifacial 80%
ComparePV verdict

Solid all-round for its segment

Rank 9,130 of 14,129
Compare panels Datasheet PDF
Power (Wp)
420
Typical for its class
Efficiency (%)
21.00
Typical · median 21.50%
Density (Wp/m²)
210.2
Typical · median 214.9
Temp (%/°C)
-0.290
Typical · median -0.300
Weight (kg)
21.0
Typical · median 23.0 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

6,992 panels in the 320-520 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 21.00% 21.50% Typical 9,828
Power density 210.2 214.9 Typical 9,798
Temperature coefficient -0.290 -0.300 Typical 2,220
Weight per kWp 50.0 53.0 Typical 3,329
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 · 0 caution
Best for

Residential, commercial, shaded-installations and hot-climate.

Notes from the database
  • Efficiency of 21.0% is 0.8pp below the database median (21.8%)
  • Power density of 210.2 W/m² is 7.9 W/m² below database median (218.1 W/m²) - needs more roof space
  • At -0.29%/°C, hot weather performance is typical for database panels
  • At 21.0 kg, this panel is 5.5 kg lighter than database median (26.5 kg) - easier handling during installation
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.00 % Typical Segment median 21.50%
Vmpp · Impp 42.50 V · 9.89 A Operating point at max power
Voc · Isc 50.50 V · 10.53 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 23.0 kg
Cells 144 Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.300 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 367 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Trina Solar 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.

Trina Solar's Vertex Bifacial Dual Glass Performance Warranty Trina Solar's Vertex Bifacial Dual Glass 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
-
With bifacial gain
-

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

Heat losses
-0.290 %/°C against a segment median of -0.300
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Trina Solar TSM-420NEG9RC.27 420 W 21.00% -0.290 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, hotter, +2.8 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +2.8 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.7 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.6 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg +40 W, +2.6 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, cooler, +2.6 pp
TSM-DE09R.05-405 405 W 20.30% -0.340 21.8 kg Hotter, -0.7 pp, -5 yr warranty
TSM-DE09R.05-410 410 W 20.50% -0.340 21.8 kg Hotter, -0.5 pp, -5 yr warranty
TSM-DE09R-415 415 W 20.80% -0.340 21.8 kg Hotter, -5 yr warranty
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, cooler, +4.0 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +75 W, cooler, +3.8 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, cooler, +3.7 pp
WST-505BKX54-A2 505 W 24.70% -0.260 25.0 kg +85 W, heavier, +3.7 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +70 W, cooler, +3.5 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, cooler, +3.5 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, cooler, +3.5 pp

Found 1402 panels of the same or similar size to this one, within ±10 mm. See them here Found 1432 panels of the same or similar size to this one, within ±25 mm. See them here Found 3651 panels of the same or similar size to this one, within ±50 mm. See them here Found 3999 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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