--- title: "Trina Solar TSM-NEG21C.20 725 725W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-NEG21C.20 725 725W solar panel. Specs: 23.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-neg21c-20-725" updated: 2026-09-11 --- # Trina Solar TSM-NEG21C.20 725 Space saver, no clear weak spot 420 panels in the segment TOPCon 700-750 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG21C.20 725 - **Series:** Vertex N - **Rated power:** 725 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) | 725 W | 715 W | Strong - top 17% | | | Module efficiency | 23.30% | 23.00% | Strong - top 19% | 1,017 | | Power density | 233.4 | 230.2 | Strong - top 18% | 936 | | 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 | 23.30% | 23.00% | Strong - top 19% | 1,017 | | Power density | 233.4 | 230.2 | Strong - top 18% | 936 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.8 | 52.9 | Typical | 6,514 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **233.4 watts per square metre** - Top 18% of the TOPCon 700-750 W segment, against a median of 230.2. - **23.30% module efficiency** - Top 19% of the TOPCon 700-750 W segment, against a median of 23.00%. - **Best for:** Utility-scale, commercial and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 725 W - **Efficiency:** 23.30 % - **Voltage at Pmax (Vmp):** 41.50 V - **Current at Pmax (Imp):** 17.47 A - **Open-circuit voltage (Voc):** 49.60 V - **Short-circuit current (Isc):** 18.54 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 - **Bifacial gain:** 20.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.3 kg - **Area:** 3.11 m2 - **Power density:** 233.4 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:** 634 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1017 of 14005 | | Power density | 936 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 6514 of 14005 | | Warranty | 21 of 14005 | ## About this series Trina Solar Vertex N modules are based on **N-type cells in i-TOPCon technology**, designed to maximize gains throughout the entire lifecycle of the installation. In practice, this means better performance at high temperatures and significantly more stable energy production over the long term - especially where predictability and low operational costs are key. A major highlight is the **dual-glass construction**, which enhances resistance to moisture, temperature fluctuations, and micro-cracks. Combined with **high bifaciality** (in two-sided variants), the Vertex N series enables a truly significant gain when modules operate above a light-colored background or on elevated structures. Vertex N is an excellent choice for utility-scale PV farms and commercial installations, where **lower BOS costs**, easier logistics, and compatibility with trackers are crucial. It stands out from the competition thanks to its refined platform for large-size cells and a focus on long-term reliability, rather than short-term paper gains. ## Notable figures - At 23.3% efficiency, this panel is on par with typical \*\*TOPCon 700-750W\*\* modules - Power density of 233.4 W/m² packs 3.2 W/m² more into the same footprint vs \*\*TOPCon 700-750W\*\* median (230.2 W/m²) - 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 7% for efficiency among all TOPCon panels ## Questions ### What is the warranty on Trina Solar Vertex N panels? Trina Solar Vertex N panels come with a 12-year product warranty and a 30-year linear power warranty. First-year power degradation is capped at 1%, followed by a maximum annual decline of 0.4% in subsequent years. This means the module still delivers a substantial share of its rated power after 30 years, giving PV farm and commercial installation investors a predictable return and lower long-term risk. ### How does i-TOPCon technology in the Vertex N differ from classic PERC panels? N-type cells built with i-TOPCon technology, used in the Vertex N series, have lower recombination losses and perform better at high temperatures than classic P-type PERC cells. In practice this means higher efficiency (up to 740 Wp), slower power degradation over time, and more stable energy output throughout the system's lifetime, especially in hot climates or high-irradiance sites. ### Are Vertex N panels bifacial? This particular model in the Vertex N series is a mono-facial variant - it generates power only from the front side of the module. Trina Solar also offers bifacial versions within the same series, which can deliver a higher yield when mounted over a reflective surface or on elevated racking. The choice between mono-facial and bifacial depends on the installation type - sloped roofs rarely capture the full bifacial gain, so the mono-facial variant is often the more cost-effective choice there. ### What installations are Trina Solar Vertex N panels rated up to 740 Wp best suited for? Vertex N panels rated up to 740 Wp are designed mainly for utility-scale PV farms and large commercial installations, where lowering BoS (Balance of System) cost per watt installed matters most. Larger dimensions and higher unit power mean fewer modules, mounts, and cables per kW, simplifying logistics, tracker-mounted installation, and reducing overall install time compared to smaller panels. ### Is Trina Solar a reliable Tier 1 manufacturer, and is the Vertex N series a good investment? Yes, Trina Solar is one of the world's largest PV module manufacturers, classified as Tier 1 - meaning financial stability, continuous production, and a proven ability to honor long-term warranties. The company is headquartered in China and has extensive experience in utility-scale solar. Combined with the Vertex N series' 30-year power warranty, this gives investors a high degree of confidence in the system's durability and profitability. ### How does the dual-glass construction in the Vertex N improve durability in harsh climates? The dual-glass construction, where cells are protected by glass on both sides instead of a rear backsheet, significantly improves resistance to moisture, microcracks, and PID degradation. As a result, Vertex N panels better withstand large temperature swings, high humidity, and coastal or industrial environments. This design translates into a longer module lifespan and lower failure risk over the 30-year period covered by the power warranty. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DT-M-0042-G-EN-J-Datasheet_Vertex_NEG21C20_2025_C-d2558fe22f03.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -45 W, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -50 W, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -30 W, lighter, +1.6 pp | | [AIKO AIKO-A690-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a690-mae78dw) | 690 W | -35 W, lighter, +1.4 pp | | [AIKO AIKO-A685-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a685-mae78dw) | 685 W | -40 W, lighter, +1.2 pp | | [Trina Solar TSM-NEG21C.20Q-760](https://comparepv.com/panel/trina-solar-tsm-neg21c-20q-760) | 760 W | +35 W, cooler, +1.2 pp | | [AIKO AIKO-A680-MAH78Dw](https://comparepv.com/panel/aiko-aiko-a680-mah78dw) | 680 W | -45 W, lighter, +1.0 pp | | [Trina Solar TSM-DEG21C.20-645](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-645) | 645 W | -80 W, hotter, -2.5 pp | | [Trina Solar TSM-DEG21C.20-650](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg21c-20-650) | 650 W | -75 W, hotter, -2.4 pp | | [Trina Solar TSM-DE21-655W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-655w) | 655 W | -70 W, lighter, -2.2 pp | | [Trina Solar TSM-DE21-660W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-660w) | 660 W | -65 W, lighter, -2.1 pp | | [Trina Solar TSM-DE21-665W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-665w) | 665 W | -60 W, lighter, -1.9 pp | | [Trina Solar TSM-DE21-670W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-670w) | 670 W | -55 W, lighter, -1.8 pp | | [Trina Solar TSM-DE21-675W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-de21-675w) | 675 W | Hotter, lighter, -1.6 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +80 W, cooler, +1.8 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-neg21c-20-725 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.