--- title: "Trina Solar TSM-NEG20C.20-640 Solar Panel: Specs & Datasheet | ComparePV" description: "Trina Solar TSM-NEG20C.20-640 solar panel. Specs: 22.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-neg20c-20-640" image: "https://comparepv.com/og/panel/trina-solar-tsm-neg20c-20-640.png" updated: 2026-09-11 --- # Trina Solar TSM-NEG20C.20-640 Middle of its segment, heavy for its output 1,085 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG20C.20-640 - **Series:** Vertex N (TSM-NEG20C.20) - **Rated power:** 640 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1085 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 620 W | Strong - top 9% | | | Module efficiency | 22.60% | 22.80% | Typical | 3,716 | | Power density | 226.1 | 227.7 | Typical | 3,740 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 34.9 kg | 32.8 kg | Weak - bottom 22% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.60% | 22.80% | Typical | 3,716 | | Power density | 226.1 | 227.7 | Typical | 3,740 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 54.5 | 53.1 | Weak - bottom 22% | 8,943 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **54.5 kg per kWp** - Bottom 22% of the TOPCon 600-650 W segment, against a median of 53.1. - **Best for:** Commercial, utility-scale, hot-climate and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.60 % - **Voltage at Pmax (Vmp):** 37.00 V - **Current at Pmax (Imp):** 17.30 A - **Open-circuit voltage (Voc):** 44.50 V - **Short-circuit current (Isc):** 18.36 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:** 120 - **Bifacial:** yes ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 34.9 kg - **Area:** 2.83 m2 - **Power density:** 226.1 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:** 559 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3716 of 14129 | | Power density | 3740 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 8943 of 14129 | | Warranty | 21 of 14129 | ## About this series Trina Solar Vertex N (TSM-NEG20C.20) is designed for maximum energy yield in real-world conditions - not just in the lab. The use of **n-type i-TOPCon cells** means higher operational stability and reduced susceptibility to typical phenomena that gradually reduce energy production in many standard modules. In practice, this translates to more predictable yields and better long-term profitability for installations. A major difference is also the **bifacial dual-glass construction**, which allows for capturing reflected light from the ground while simultaneously increasing mechanical durability and resilience in challenging locations. The Vertex N series also utilizes **multi-busbar technology**, improving current collection and maintaining performance under less-than-ideal sunlight conditions. For investors, low **temperature coefficient** is also important, helping maintain production during hot summer months. This makes it an excellent choice for utility-scale PV farms, commercial installations, and modern projects where the focus is on the energy payback and long-term reliability, not just the specifications on the datasheet. ## Notable figures - Efficiency of 22.6% matches the \*\*TOPCon 600-650W\*\* median - Power density of 226.1 W/m² matches the \*\*TOPCon 600-650W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 600-650W\*\* median - At 34.9 kg, this panel is 2.1 kg heavier than the \*\*TOPCon 600-650W\*\* median (32.8 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### Is the Trina Solar Vertex N TSM-NEG20C.20 series still available for purchase? No, this series has been discontinued. Trina Solar replaced it with newer Vertex N models, including the TSM-NEG21C.20 rated up to 720 Wp. Some TSM-NEG20C.20 units may still be found through distributors clearing existing stock, so buyers should check the manufacturing date and remaining warranty coverage before purchasing. ### How do the n-type i-TOPCon cells in Vertex N differ from standard PERC cells? N-type i-TOPCon cells exhibit lower LID and LeTID degradation and a slower power decline in the early years of operation compared to cheaper p-type PERC cells. In practice, this translates to higher and more predictable energy yield over the module's lifetime, which matters most for large-scale solar farms evaluated over a 25-30 year cycle. ### How much extra energy does the bifacial dual-glass design actually deliver? The rear-side energy gain depends on ground albedo and mounting height, but with high-reflectance surfaces such as gravel or white roofing, annual gains can range from a few percent to over ten percent compared to a monofacial module. The dual-glass construction also improves mechanical strength and durability in harsher environments. ### What warranty does Trina Vertex N TSM-NEG20C.20 come with? The manufacturer provides a 12-year product warranty and a 30-year power output warranty, which is standard for premium n-type TOPCon panels. Note that despite production being discontinued, the warranty remains valid for already-installed systems as long as the manufacturer's service conditions are met. ### Does the Vertex N TSM-NEG20C.20 perform well in high summer temperatures? Yes, n-type TOPCon technology has a lower temperature coefficient of power than traditional PERC cells, meaning less output loss as the module heats up. This is a meaningful advantage for ground-mount and flat-roof installations where panels reach high operating temperatures during summer. ### What kind of installations is the 650 Wp Vertex N TSM-NEG20C.20 series best suited for? Given its high per-unit power, bifacial capability, and dual-glass build, this series was designed mainly for solar farms and large commercial installations, where a low cost per Wp and long-term reliability matter most, rather than for typical residential pitched-roof setups. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/dt-m-0041-d-datasheet-vertex-neg20c-20-en-2024-a-web-a5b47f013b2f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, lighter, +2.6 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, lighter, +2.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.4 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +35 W, cooler, +2.4 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +30 W, lighter, +2.2 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +30 W, lighter, +2.2 pp | | [Trina Solar TSM-DEG20C.20-585W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg20c-20-585w) | 585 W | -55 W, hotter, -1.9 pp | | [Trina Solar TSM-DEG20C.20-590W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg20c-20-590w) | 590 W | -50 W, hotter, -1.8 pp | | [Trina Solar TSM-DEG20C.20-595W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg20c-20-595w) | 595 W | -45 W, hotter, -1.6 pp | | [Trina Solar TSM-DEG20C.20-600W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg20c-20-600w) | 600 W | -40 W, hotter, -1.4 pp | | [Trina Solar TSM-DEG20C.20-605W](https://comparepv.com/panel/trina-solar-co-ltd-tsm-deg20c-20-605w) | 605 W | -35 W, hotter, -1.2 pp | | [Trina Solar TSM-NEG20C.20-625](https://comparepv.com/panel/trina-solar-tsm-neg20c-20-625) | 625 W | -15 W, -0.5 pp | | [Trina Solar TSM-NEG20C.20-630](https://comparepv.com/panel/trina-solar-tsm-neg20c-20-630) | 630 W | -10 W, -0.3 pp | | [Trina Solar TSM-NEG20C.20-635](https://comparepv.com/panel/trina-solar-tsm-neg20c-20-635) | 635 W | -0.2 pp | | [Trina Solar TSM-NEG20C.20-645](https://comparepv.com/panel/trina-solar-tsm-neg20c-20-645) | 645 W | Very close match | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, lighter, +1.4 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-neg20c-20-640 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.