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Trina Solar TSM-NEG21C.20 705W
Trina Solar Brand review

TSM-NEG21C.20 705W

705 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 1,022 of 14,129
Compare panels Datasheet PDF
Power (Wp)
705
Weak · bottom 22%
Efficiency (%)
22.70
Weak · bottom 23%
Density (Wp/m²)
227.0
Weak · bottom 21%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
38.3
Weak · bottom 12%
Warranty (yrs)
30
Typical · median 30 yrs

The Vertex N series is a breakthrough solution based on N-type TOPCon technology, which significantly increases module efficiency beyond market standards. Thanks to the use of a bifacial dual glass construction, these panels absorb light from both sides, which, combined with the double glass, guarantees exceptional resistance to difficult weather conditions and extreme mechanical durability. Using monocrystalline cells in an advanced architecture allows for maximizing energy yields while reducing the mounting area, which optimizes the costs of the entire installation. A key advantage of this model is minimal light-induced degradation and an excellent temperature coefficient, ensuring the system works efficiently even on very sunny and hot days. This solution is dedicated primarily to large-scale photovoltaic farms and demanding commercial installations, where the priority is the highest return on investment rate. Vertex N effectively solves the problem of power drops over time, offering energy production stability for several decades. What sets them apart from competing products is an innovative approach to cell packing density and increased resistance to micro-cracks, making them some of the most reliable modules currently available on the Polish market.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.70% 23.00% Weak · bottom 23% 3,364
Power density 227.0 230.2 Weak · bottom 21% 3,418
Temperature coefficient -0.290 -0.290 Typical 2,220
Weight per kWp 54.3 52.9 Weak · bottom 12% 8,684
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

Utility-scale, commercial and hot-climate.

Not ideal for

Weight-limited structures, roofs where every square metre has to count and tight roof space.

Watch-outs
54.3 kg per kWp

Bottom 12% of the TOPCon 700-750 W segment, against a median of 52.9.

227.0 watts per square metre

Bottom 21% of the TOPCon 700-750 W segment, against a median of 230.2.

22.70% module efficiency

Bottom 23% of the TOPCon 700-750 W segment, against a median of 23.00%.

Notes from the database
  • Efficiency of 22.7% matches the TOPCon 700-750W median
  • Power density of 226.9 W/m² is 3.2 W/m² below TOPCon 700-750W median (230.2 W/m²) - needs more roof space
  • Temperature coefficient of -0.29%/°C matches the TOPCon 700-750W median
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof
  • In the top 24% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 705 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.70 % Weak Segment median 23.00%
Vmpp · Impp 40.70 V · 17.33 A Operating point at max power
Voc · Isc 48.80 V · 18.36 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 38.3 kg Weak Weak · bottom 12%
Cells 132 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
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 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 616 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 705 Wp appear here. The rest cover the whole series.

I-V Curves of PV Module (705W) I-V Curves of PV Module (705W) 705 W P-V Curves of PV Module (705W) P-V Curves of PV Module (705W) 705 W

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 -0.290
-
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-NEG21C.20 705W 705 W 22.70% -0.290 38.3 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -30 W, lighter, +2.3 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +2.3 pp
WST-675BKX72-A2 675 W 25.00% -0.260 32.1 kg -30 W, lighter, +2.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +2.2 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -35 W, lighter, +2.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -35 W, lighter, +2.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -35 W, lighter, +2.1 pp
TSM-DEG21C.20-645 645 W 20.80% -0.340 38.3 kg -60 W, hotter, -1.9 pp
TSM-DEG21C.20-650 650 W 20.90% -0.340 38.3 kg -55 W, hotter, -1.8 pp
TSM-DE21-655W 655 W 21.10% -0.340 32.3 kg Hotter, lighter, -1.6 pp
TSM-DE21-660W 660 W 21.20% -0.340 32.3 kg Hotter, lighter, -1.5 pp
TSM-DE21-665W 665 W 21.40% -0.340 32.3 kg Hotter, lighter, -1.3 pp
TSM-DE21-670W 670 W 21.50% -0.340 32.3 kg Hotter, lighter, -1.2 pp
TSM-DE21-675W 675 W 21.70% -0.340 32.3 kg Hotter, lighter, -1.0 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +100 W, cooler, +2.4 pp

Found 1393 panels of the same or similar size to this one, within ±10 mm. See them here Found 1403 panels of the same or similar size to this one, within ±25 mm. See them here Found 1403 panels of the same or similar size to this one, within ±50 mm. See them here Found 1435 panels of the same or similar size to this one, within ±100 mm. See them here

About the Vertex N N-type TOPCon Bifacial Dual Glass Monocrystalline Module series

6 answered

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

How does N-type TOPCon technology in the Trina Vertex N differ from standard P-type PERC panels?
N-type TOPCon cells use phosphorus doping instead of boron, eliminating light-induced degradation (LID) common in PERC modules. Thanks to an additional tunnel oxide passivation layer, the Vertex N reaches up to 23.2% efficiency and a lower annual degradation rate (0.4%), resulting in higher energy yield over the module's lifetime compared to conventional P-type panels.
Does the bifacial dual-glass design of the Vertex N actually increase energy production?
Yes, the rear side of the module captures light reflected off the ground, roof, or mounting structure. Depending on the surface albedo (e.g., light gravel or white roofing), the additional energy gain can range from a few percent to over ten percent above standard front-side output, making it especially cost-effective for large ground-mounted farms with elevated racking.
What warranty comes with Trina Vertex N modules and what does it cover exactly?
The manufacturer provides a 12-year product warranty against material and workmanship defects, plus a 30-year linear power warranty guaranteeing at least 87.4% of nominal power output after 30 years, with an annual degradation rate of about 0.4%. This exceeds the standard 25-year power warranties offered by many competitors.
What is the maximum power output of the Vertex N and what installations is it suited for?
The module delivers up to 720 Wp of maximum power, making it one of the highest-output panels on the market. Given its large dimensions (approx. 2384 x 1303 mm) and high per-unit power, the Vertex N is primarily designed for large-scale solar farms and commercial or industrial installations, where minimizing module count and installation cost per watt is a priority.
Is Trina Solar, the manufacturer of the Vertex N, a reliable Tier 1 bankable supplier?
Trina Solar is a Tier 1 manufacturer based in China with over 25 years of market presence, a global supply chain, and bankability certification (Bloomberg Tier 1). Tier 1 status reflects the company's financial stability and reliable warranty support, which matters for large commercial projects financed by banks or investment funds.
Does the dual-glass construction of the Vertex N improve resistance to microcracks and harsh weather?
Yes, the dual-glass design replaces the rear backsheet with a second tempered glass layer, significantly increasing mechanical rigidity and resistance to snow load, wind, and microcracks that can occur during transport and installation. Glass on both sides also better protects the cells from moisture ingress and PID degradation over the module's long service life.
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