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

TSM-NEG21C.20-705

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 Trina Solar Vertex N (TSM-NEG21C.20 695-720W) series was designed with large-scale PV farms and major installations in mind, where maximizing output per hectare and achieving a real reduction in energy costs throughout the entire lifecycle are key priorities. The application of N-type i-TOPCon cells translates to excellent performance at high temperatures and more stable output over the long term, helping to mitigate the risk of underestimating yields in financial models. Another key advantage is the high power output with a lower voltage configuration - in practice, this simplifies string design and reduces BOS costs, especially at large scales.

The modules feature bifacial generation, enabling better utilization of reflected light on light-colored ground surfaces, gravel, or with appropriately selected infrastructure. They are also distinguished by their dual-glass construction, valued for its environmental resilience and longevity in demanding conditions. This is the series for investors and EPCs seeking fewer modules per MW, simpler installation logistics, and predictable performance year after year.

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 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
  • 226.9 W/m² power density is 3.2 W/m² below TOPCon 700-750W median (230.2 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 700-750W median
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces
  • Ranked #3364 out of 14129 panels for efficiency in the database

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.

Performance Warranty Performance Warranty 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.20-705 705 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 (TSM-NEG21C.20 695–720W) series

6 answered

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

What's the difference between N-type i-TOPCon technology in Trina Vertex N panels and standard PERC cells?
N-type i-TOPCon cells have a lower degradation rate and better high-temperature performance than conventional P-type PERC cells. In practice, this means more stable energy production over the panel's lifetime and lower risk of power loss on hot days. For large PV farms, this translates into more predictable financial forecasts and higher real-world annual yield.
Is the Trina Vertex N TSM-NEG21C.20 suitable for rooftop installation, or is it strictly a utility-scale panel?
This module is designed primarily for large ground-mount installations and PV farms. At 2384×1303 mm and 38.3 kg, it's too large and heavy for most typical sloped or residential rooftops. It performs best in large-scale EPC projects where maximizing power per hectare and lowering per-watt installation cost are the priorities.
What does the low-voltage design of the Vertex N mean for installation costs (BOS)?
The module combines high power output (up to 720 Wp) with a design optimized for lower operating string voltage. This allows longer strings without exceeding inverter voltage limits, reducing the number of components needed - wiring, connectors, and mounting structures. Trina states this can cut BOS and LCOE costs by 2-6%, which adds up significantly on large farms.
What warranty comes with the Trina Vertex N TSM-NEG21C.20 panels?
Trina offers a 12-year product warranty along with a 30-year linear power warranty, guaranteeing at least 87.4% of nominal power at the end of that period. This is standard for the latest generation of N-type modules from tier-1 manufacturers, giving investors confidence in long-term project profitability.
Does the bifacial design of the Vertex N actually increase energy yield?
Yes, the dual-glass bifacial construction captures additional light reflected from the ground on the rear side of the panel. The biggest gains, ranging from a few to over ten percent, come with light-colored, gravel, or white ground surfaces and sufficient mounting height above the ground. On dark ground or low-clearance mounting, the effect is much smaller.
How does the Trina Vertex N perform in high summer temperatures?
Thanks to i-TOPCon technology, the module has a low power temperature coefficient of -0.29%/°C, better than typical PERC panels. This means a smaller performance drop during heat waves and more stable energy output in hot months, which matters when planning yield estimates for installations in warmer climates.
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