--- title: "Trina Solar TSM-NEG18R.25-485 485W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-NEG18R.25-485 485W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg18r-25-485" updated: 2026-09-11 --- # Trina Solar TSM-NEG18R.25-485 Middle of its segment, modest efficiency 1,089 panels in the segment TOPCon 450-500 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG18R.25-485 - **Series:** Vertex S+ (TSM-NEG18R.25 485-515W) - **Rated power:** 485 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 450-500 W (1089 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 485 W | 465 W | Strong - top 20% | | | Module efficiency | 21.80% | 22.52% | Weak - bottom 12% | 7,022 | | Power density | 218.1 | 225.2 | Weak - bottom 13% | 6,998 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 23.5 kg | 24.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 22.52% | Weak - bottom 12% | 7,022 | | Power density | 218.1 | 225.2 | Weak - bottom 13% | 6,998 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 48.5 | 52.2 | Typical | 2,282 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.80% module efficiency** - Bottom 12% of the TOPCon 450-500 W segment, against a median of 22.52%. - **218.1 watts per square metre** - Bottom 13% of the TOPCon 450-500 W segment, against a median of 225.2. - **Best for:** Residential, commercial, shaded-installations and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 485 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 32.70 V - **Current at Pmax (Imp):** 14.84 A - **Open-circuit voltage (Voc):** 39.40 V - **Short-circuit current (Isc):** 15.76 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:** 108 ### Physical - **Length:** 1961 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 23.5 kg - **Area:** 2.22 m2 - **Power density:** 218.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 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:** 424 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7022 of 14005 | | Power density | 6998 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 2282 of 14005 | | Warranty | 21 of 14005 | ## About this series Trina Solar's Vertex S+ Series (TSM-NEG18R.25 485-515W) are modules designed for rooftop installations, where high power density and reliable performance over years are key. The use of **N-type i-TOPCon cells** helps reduce typical performance losses over time and stabilizes energy yields, translating to a better energy production balance throughout the installation's entire life cycle. The **dual-glass (bifacial)** construction increases resistance to environmental factors and micro-cracks, while simultaneously offering additional gains from reflected light where the roof and surroundings permit. For contractors, the **compact C&I roof design** is important - easier logistics, more efficient mounting, and compatibility with popular mounting systems and inverters. The series also stands out with its approach to installation costs: **lower BOS costs and faster payback**, achieved through high power per module and the possibility of string configuration optimization. This is an excellent choice for companies, warehouses, commercial facilities, and premium residential installations. ## Notable figures - Module efficiency of 21.8% is 0.7pp below average for \*\*TOPCon 450-500W\*\* panels (median: 22.5%) - Power density of 218.1 W/m² is 7.1 W/m² below \*\*TOPCon 450-500W\*\* median (225.2 W/m²) - needs more roof space - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 450-500W\*\* panels - Ranked #7022 out of 14005 panels for efficiency in the database ## Questions ### Are Trina Solar Vertex S+ TSM-NEG18R.25 panels bifacial? No, this specific version of the Vertex S+ TSM-NEG18R.25 series is a monofacial module built with a dual-glass construction, not a bifacial panel. The dual-glass design primarily improves mechanical strength, resistance to microcracks, and long-term parameter stability, rather than generating additional yield from rear-side reflected light. If you need a true bifacial module, check other variants in Trina Solar's lineup designed specifically for bifacial installations. ### What warranty comes with the Vertex S+ TSM-NEG18R.25 series? The manufacturer offers a 15-year product warranty and a 30-year linear power output warranty. In practice, this means the panel should retain at least 87.4% of its rated power after 30 years, with no more than a 1% degradation in the first year. This is a standard offering from Tier 1 manufacturers using N-type TOPCon cells, giving investors predictable energy yield throughout the system's lifetime. ### What is N-type i-TOPCon technology and why does Trina Solar use it in Vertex S+? N-type i-TOPCon is an advanced cell technology that reduces light-induced degradation losses compared to older P-type cells like PERC. This allows the module to maintain higher efficiency over time and perform better under high temperatures. In the Vertex S+ TSM-NEG18R.25 series, this technology enables up to 515 W of power and 23.2% efficiency with 108 cells, translating into higher energy yield per square meter of roof space. ### Are Vertex S+ 515W panels suitable for C&I roofs like warehouses and commercial buildings? Yes, the module's dimensions of 1961×1134×30 mm and weight of 23.5 kg were designed for a compact form factor compatible with popular mounting systems and inverters used on commercial and industrial roofs. The high wattage per panel allows more kilowatts to be installed on a limited roof area, which matters for warehouse and service-building installations where every square meter of available space counts. ### What are the dimensions and weight of the Trina Vertex S+ TSM-NEG18R.25 panel? The module measures 1961×1134×30 mm and weighs 23.5 kg, with a 1.6 mm glass thickness in its dual-glass construction. These dimensions are similar to standard C&I panels, which simplifies on-site logistics, roof transport, and installation using typical racking systems without needing specialized non-standard mounting hardware. ### Does a high wattage module up to 515 W actually lower solar installation costs? Yes, higher-wattage panels mean fewer modules, less racking, wiring, and installation labor are needed to reach the same system capacity, directly reducing BOS (Balance of System) costs. Vertex S+ panels up to 515 W also allow better string-length optimization for specific inverters, cutting design and installation time and speeding up return on investment, especially for commercial and industrial-scale projects. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/dt-m-0110-g-en-b-datasheet-vertex-s-neg18r-25-2025-b-dc37d622739d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +25 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +20 W, cooler, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +15 W, cooler, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +2.7 pp | | [Trina Solar TSM-NEG18R.28-475](https://comparepv.com/panel/trina-solar-tsm-neg18r-28-475) | 475 W | -10 W, -0.4 pp | | [Trina Solar TSM-NEG18R.28-480](https://comparepv.com/panel/trina-solar-tsm-neg18r-28-480) | 480 W | Very close match | | [Trina Solar TSM-NEG18RC.27-490](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg18rc-27-490) | 490 W | Very close match | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | +75 W, cooler, +3.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +70 W, cooler, +2.8 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | +65 W, lighter, +2.6 pp | | [JA Solar JAT60S40-540/LR](https://comparepv.com/panel/ja-solar-jat60s40-540-lr) | 540 W | +55 W, cooler, +2.6 pp | | [Gokin GK-5-60HG-540M](https://comparepv.com/panel/gokin-gk-5-60hg-540m) | 540 W | +55 W, cooler, +2.6 pp | | [Jinko Solar JKM545-54QL6-DV-F1-EU](https://comparepv.com/panel/jinko-solar-jkm545-54ql6-dv-f1-eu) | 545 W | +60 W, heavier, +2.5 pp | | [Longi Solar LR7-60HVH-545M](https://comparepv.com/panel/longi-lr7-60hvh-545m) | 545 W | +60 W, cooler, +2.4 pp | --- Source: https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg18r-25-485 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.