--- title: "Trina Solar TSM-DEG18MC.20(II)-495 495W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-DEG18MC.20(II)-495 495W solar panel. Specs: 20.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-deg18mc-20-ii-495" updated: 2026-09-11 --- # Trina Solar TSM-DEG18MC.20(II)-495 Strong in heat, heavy for its output 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-DEG18MC.20(II)-495 - **Series:** Vertex (Bifacial Dual Glass Monocrystalline Module) - **Rated power:** 495 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 450-500 W (449 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 495 W | 460 W | Strong - top 5% | | | Module efficiency | 20.50% | 20.82% | Weak - bottom 20% | 11,308 | | Power density | 205.4 | 208.5 | Weak - bottom 20% | 11,210 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 19% | 8,778 | | Weight (kg) | 30.1 kg | 24.5 kg | Weak - bottom 6% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.50% | 20.82% | Weak - bottom 20% | 11,308 | | Power density | 205.4 | 208.5 | Weak - bottom 20% | 11,210 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 19% | 8,778 | | Weight per kWp | 60.8 | 53.1 | Weak - bottom 6% | 12,537 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Strengths - **-0.340 %/°C temperature coefficient** - Top 19% of the PERC 450-500 W segment, against a median of -0.350. - **30 year performance warranty** - Top 20% of the PERC 450-500 W segment, against a median of 25 yrs. ### Watch out for - **60.8 kg per kWp** - Bottom 6% of the PERC 450-500 W segment, against a median of 53.1. Ranked 12,537th in the whole database. - **205.4 watts per square metre** - Bottom 20% of the PERC 450-500 W segment, against a median of 208.5. - **20.50% module efficiency** - Bottom 20% of the PERC 450-500 W segment, against a median of 20.82%. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Weight-limited structures, roofs where every square metre has to count and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 495 W - **Efficiency:** 20.50 % - **Voltage at Pmax (Vmp):** 43.10 V - **Current at Pmax (Imp):** 11.49 A - **Open-circuit voltage (Voc):** 51.30 V - **Short-circuit current (Isc):** 12.09 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 150 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2187 mm - **Width:** 1102 mm - **Thickness:** 35 mm - **Weight:** 30.1 kg - **Area:** 2.41 m2 - **Power density:** 205.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 421 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11308 of 14005 | | Power density | 11210 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 12537 of 14005 | | Warranty | 21 of 14005 | ## About this series The Trina Solar Vertex series, in the **bifacial dual glass** version, was designed to genuinely increase energy yield not only from the front side but also from the rear side of the module - which is significant wherever the substrate reflects light (bright roof, gravel, concrete, membrane). The use of **two glass sheets** instead of the classic backsheet improves resistance to moisture and harsh environmental conditions, while also increasing long-term operational stability. At the level of cell technology, it stands out with a modern monocrystalline architecture featuring **multi-busbar** solutions and a half-cut cell string design - this reduces resistive losses and helps maintain high production even under partial shading or weaker insolation. In practice, users get more energy from the same surface area, and installers have an easier product to design for newer inverters and optimizers. This is an excellent proposition for PV farms, commercial installations, and rooftops, where a **higher yield from bifaciality** and the durability of the glass-glass construction matter. ## Notable figures - Efficiency of 20.5% matches the \*\*PERC 450-500W\*\* median - 205.4 W/m² power density is 3.1 W/m² below \*\*PERC 450-500W\*\* median (208.5 W/m²) - requires larger installation area - Temperature coefficient of -0.34%/°C matches the \*\*PERC 450-500W\*\* median - Weight of 30.1 kg is 5.6 kg above \*\*PERC 450-500W\*\* median (24.5 kg) - verify structural support - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## Questions ### How much extra energy can a 505 Wp Trina Solar Vertex bifacial panel generate compared to a standard monofacial module? In addition to the standard front-side yield of 505 Wp, the bifacial design captures light reflected onto the rear side of the module. Depending on the ground albedo - a light-colored roof, gravel, white membrane, or concrete - the additional annual energy gain can range from a few percent up to double digits compared to a monofacial panel of the same nominal power. ### What is the difference between a dual glass construction and a classic backsheet panel? In the dual glass version, the rear polymer backsheet is replaced with a second tempered glass sheet. This construction better protects the cells against moisture, microcracks, and PID degradation, resulting in longer and more stable module performance. Glass on both sides also enables the bifacial effect, allowing the module to generate power from its rear side as well. ### What warranty comes with the Trina Solar Vertex bifacial dual glass series? The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. This means that after 30 years of operation, the module should still deliver the power output level guaranteed by Trina Solar, which is an important factor when calculating the long-term return on investment of a PV installation. ### Is the Trina Vertex series suitable for roofs or ground-mounted sites with light-colored surfaces, such as gravel or white membrane? Yes, this is actually an ideal environment for this series. Light surfaces such as gravel, concrete, white roof membrane, or snow reflect a large amount of sunlight onto the active rear side of the bifacial panel. The higher the albedo of the surface beneath the installation, the greater the additional rear-side energy gain compared to a standard installation on a dark roof. ### What do PERC and half-cut technology mean for Vertex panels, and how do they affect performance? PERC is a cell technology featuring an additional rear passivation layer that improves light absorption and conversion efficiency. Half-cut cell technology combined with a multi-busbar layout reduces resistive losses and improves resilience to partial shading, such as from a chimney or leaves, so that shading on one section of the panel has a smaller impact on total module output. ### Is Trina Solar a reliable manufacturer, and is it worth choosing its panels for a large commercial installation or a solar farm? Trina Solar is a Chinese Tier 1 manufacturer, meaning it has a solid financial standing and long-standing experience in large-scale module production, which makes bank financing easier and reduces the risk of warranty servicing issues. The Vertex bifacial dual glass series is particularly popular for solar farms and commercial installations, where high yield per surface area and glass-glass durability matter most. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/854651712634d14491ee80-6d00a7da1cf7.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +4.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +4.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +4.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +4.0 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +4.0 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +4.0 pp | | [Trina Solar TSM-DEG18MC.20(II)-480](https://comparepv.com/panel/trina-solar-tsm-deg18mc-20-ii-480) | 480 W | -15 W, -0.6 pp | | [Trina Solar TSM-DE18M(II)-485](https://comparepv.com/panel/trina-solar-tsm-de18m-ii-485) | 485 W | Lighter, -0.4 pp, -5 yr warranty | | [Trina Solar TSM-DE18M(II)-490](https://comparepv.com/panel/trina-solar-tsm-de18m-ii-490) | 490 W | Lighter, -5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +155 W, cooler, +4.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +150 W, cooler, +4.5 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +145 W, cooler, +4.3 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +140 W, cooler, +4.1 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +135 W, cooler, +3.9 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-deg18mc-20-ii-495 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.