--- title: "Trina Solar TSM-NEG21C.20-730 730W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-NEG21C.20-730 730W solar panel. Specs: 23.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg21c-20-730" updated: 2026-09-11 --- # Trina Solar TSM-NEG21C.20-730 Efficiency leader, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG21C.20-730 - **Series:** Vertex N (TSM-NEG21C.20 715-740W) - **Rated power:** 730 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 700-750 W (420 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 730 W | 715 W | Strong - top 11% | | | Module efficiency | 23.50% | 23.00% | Strong - top 10% | 716 | | Power density | 235.0 | 230.2 | Strong - top 11% | 800 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 38.3 kg | 38.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.50% | 23.00% | Strong - top 10% | 716 | | Power density | 235.0 | 230.2 | Strong - top 11% | 800 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.5 | 52.9 | Typical | 5,993 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **23.50% module efficiency** - Top 10% of the TOPCon 700-750 W segment, against a median of 23.00%. - **235.0 watts per square metre** - Top 11% of the TOPCon 700-750 W segment, against a median of 230.2. - **Best for:** Utility-scale, commercial and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 730 W - **Efficiency:** 23.50 % - **Voltage at Pmax (Vmp):** 41.70 V - **Current at Pmax (Imp):** 17.51 A - **Open-circuit voltage (Voc):** 49.90 V - **Short-circuit current (Isc):** 18.58 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.3 kg - **Area:** 3.11 m2 - **Power density:** 235.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 638 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 716 of 14005 | | Power density | 800 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 5993 of 14005 | | Warranty | 21 of 14005 | ## About this series Trina Solar's Vertex N TSM-NEG21C.20 71 (715-740W) is designed for maximum energy yield in large-scale projects where every cost element counts and reliability matters. The use of **n-type cells in i-TOPCon technology** helps reduce typical power losses over time and stabilizes module performance in real-world conditions, even at higher temperatures. The **bifacial glass-glass construction** enables additional rear-side generation, particularly effective on farms with light backgrounds or in light-reflective systems - without the need to add more rowsof panels. A key feature of this series is the **low-voltage design**, which facilitates longer strings and truly reduces BOS costs, leading to a lower LCOE in large plants. The **multi-busbar** technology improves light capture and supports uniform current transport, while the focus on **high environmental resistance** aids applications exposed to dust, humidity, or industrial atmospheres. This is an excellent choice for PV farms and large commercial rooftops, where yield, durability, and predictable performance are top priorities. ## Notable figures - Efficiency of 23.5% matches the \*\*TOPCon 700-750W\*\* median - Power density of 235.0 W/m² packs 4.8 W/m² more into the same footprint vs \*\*TOPCon 700-750W\*\* median (230.2 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 700-750W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - Ranked #716 out of 14005 panels for efficiency in the database ## Questions ### How does i-TOPCon cell technology in Trina Vertex N panels differ from standard p-type PERC cells? N-type cells used in i-TOPCon are less susceptible to light-induced degradation (LID) and offer better temperature stability than conventional p-type PERC cells. The Vertex N series has a temperature coefficient of about -0.29%/°C, meaning smaller power losses at high operating temperatures. In practice, the panel maintains higher efficiency for longer, especially in large ground-mount installations exposed to heat buildup. ### How much extra energy does the bifacial glass-glass design in the Vertex N actually generate? Rear-side energy gain depends on ground albedo, mounting height, and tilt angle - on light-colored gravel or roofing membrane, annual output can increase by several to over ten percent. The glass-glass construction also improves mechanical durability and reduces degradation, resulting in more stable long-term yield, particularly in PV farms with reflective surroundings. ### What warranty comes with Trina Solar Vertex N TSM-NEG21C.20 panels? The manufacturer offers a 12-year product warranty and a 30-year linear power output warranty, which is standard for premium modules used in utility-scale installations. This power warranty guarantees a predictable, gradual output decline over time, making it easier to model accurate ROI when planning PV farms or large commercial installations. ### Does the Vertex N's low-voltage design actually reduce costs on large-scale installations? Yes, lower operating voltage combined with high per-module power allows longer strings to be built without exceeding inverter voltage limits. This reduces the number of strings needed, DC cabling, and other BOS components, which lowers cost per kWp on large projects - the manufacturer reports LCOE savings of a few percent compared to conventional module designs. ### Are the 715-740W Vertex N panels suitable for large commercial roofs, or only ground-mount farms? The series works well in both applications, though due to the large module size and weight of the higher-power variants, it performs best on large commercial and industrial roofs with adequate load capacity, as well as on PV farms. High environmental resistance, including against dust and moisture, supports operation in harsher conditions typical of warehouse or industrial rooftops. ### What does multi-busbar technology add compared to panels with fewer busbars? A higher number of thin busbars shortens the current path within each cell, reducing resistive losses and improving light capture by minimizing cell shading. This results in higher module efficiency and better resistance to microcracks, which matters for transport and installation of these large-format, high-power panels. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/dt-m-0042-g-en-j-datasheet-vertex-neg21c-20-2025-c-1-06ab4d423bce.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -50 W, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | -30 W, lighter, +1.5 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -35 W, lighter, +1.4 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | -40 W, lighter, +1.2 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | -45 W, lighter, +1.0 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +30 W, cooler, +1.0 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | -50 W, lighter, +0.8 pp | | [Gokin GK-4-78HGBD-780M](https://comparepv.com/panel/gokin-gk-4-78hgbd-780m) | 780 W | +50 W, cooler, +0.8 pp | | [AIKO AIKO-A780-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a780-grh78dw) | 780 W | +50 W, cooler, +0.8 pp | | [Trina Solar TSM-DEG21C.20-645](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-645) | 645 W | -85 W, hotter, -2.7 pp | | [Trina Solar TSM-DEG21C.20-650](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-650) | 650 W | -80 W, hotter, -2.6 pp | | [Trina Solar TSM-DE21-655W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-655w) | 655 W | -75 W, lighter, -2.4 pp | | [Trina Solar TSM-DE21-660W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-660w) | 660 W | -70 W, lighter, -2.3 pp | | [Trina Solar TSM-DE21-665W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-665w) | 665 W | -65 W, lighter, -2.1 pp | | [Trina Solar TSM-DE21-670W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-670w) | 670 W | -60 W, lighter, -2.0 pp | | [Trina Solar TSM-DE21-675W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-675w) | 675 W | -55 W, lighter, -1.8 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +75 W, cooler, +1.6 pp | --- Source: https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg21c-20-730 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.