--- title: "Trina Solar TSM-DE09R.08-420 420W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-DE09R.08-420 420W solar panel. Specs: 21.00% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-de09r-08-420" updated: 2026-09-11 --- # Trina Solar TSM-DE09R.08-420 Space saver, no clear weak spot 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-DE09R.08-420 - **Series:** Vertex S Backsheet Monocrystalline Module - **Rated power:** 420 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 410 W | Typical | | | Module efficiency | 21.00% | 20.60% | Strong - top 23% | 9,758 | | Power density | 210.2 | 206.2 | Strong - top 19% | 9,728 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight (kg) | 21.8 kg | 22.0 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.00% | 20.60% | Strong - top 23% | 9,758 | | Power density | 210.2 | 206.2 | Strong - top 19% | 9,728 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 24% | 8,778 | | Weight per kWp | 51.9 | 53.0 | Typical | 5,315 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Strengths - **210.2 watts per square metre** - Top 19% of the PERC 400-450 W segment, against a median of 206.2. - **21.00% module efficiency** - Top 23% of the PERC 400-450 W segment, against a median of 20.60%. - **-0.340 %/°C temperature coefficient** - Top 24% of the PERC 400-450 W segment, against a median of -0.350. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.00 % - **Voltage at Pmax (Vmp):** 42.00 V - **Current at Pmax (Imp):** 10.01 A - **Open-circuit voltage (Voc):** 50.10 V - **Short-circuit current (Isc):** 10.58 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:** 144 ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.8 kg - **Area:** 2.00 m2 - **Power density:** 210.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 345 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9758 of 14005 | | Power density | 9728 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 5315 of 14005 | | Warranty | 9798 of 14005 | ## About this series Trina Solar's Vertex S Backsheet Monocrystalline Module series was designed for maximum energy yield on rooftops, where every square meter counts and fast installation is key. Thanks to the Vertex platform based on a 210 mm waffle and solutions such as **1/3-cut and high-density interconnect**, the modules achieve high efficiency in a compact format, facilitating adaptation to pitched roofs with tile and window sections, multiple shading zones. The application of **multi-busbar technology** supports stable operation and better current collection from the cells, while the electrical string architecture enables flexible string design. In practice, this series addresses typical challenges in rooftop installations - it allows increasing the total system power without modifying the roof structure, reduces the time of the installation team's work, and minimizes the risk of equipment mismatch. The Backsheet is the choice for investors seeking a classic module structure that combines durability with a favorable cost-benefit ratio. It is an excellent option for **residential installations** and small commercial systems, where **compatibility with popular inverters and roof constructions** and aesthetics matter. ## Notable figures - At 21.0% efficiency, this panel is on par with typical \*\*PERC 400-450W\*\* modules - At 210.2 W/m² power density, this panel generates 4.0 W/m² more per unit area than \*\*PERC 400-450W\*\* median (206.2 W/m²) - Temperature coefficient of -0.34%/°C matches the \*\*PERC 400-450W\*\* median - Ranked #9758 out of 14005 panels for efficiency in the database ## Questions ### Are Trina Solar Vertex S Backsheet 435 Wp panels suitable for a pitched roof with roof windows? Yes, this is one of the series' main use cases. Thanks to a compact format based on 210 mm wafers and 1/3-cut cell architecture, the modules are easier to fit around roof windows, dormers, and chimneys without losing overall system power. The smaller dimensions also simplify transport and installation on a typical single-family home roof structure. ### What is the warranty on Trina Solar Vertex S Backsheet modules and what does it cover? The manufacturer offers a 15-year product warranty covering material and workmanship defects, plus a 25-year power output warranty. As a Tier 1 manufacturer with a long track record, Trina Solar provides real service assurance, which matters when planning the return on investment over a quarter-century timeframe. ### How does PERC technology in this series differ from bifacial modules? Vertex S Backsheet modules use monofacial PERC cells, generating energy only from the front side. Unlike bifacial panels, they don't require a bright, light-reflecting surface or special mounting setup, which simplifies installation on pitched roofs and lowers overall system cost while maintaining high efficiency. ### How many Trina Vertex S 435 Wp panels are needed for a 5 kW residential rooftop system? At 435 Wp per unit, a roughly 5 kW system needs approximately 11-12 modules, giving a total capacity of around 4.8-5.2 kWp. The exact number depends on available roof area, tilt angle, and shading, so it's worth confirming the layout with an installer. ### Does the multi-busbar technology in Trina Vertex S panels translate into a real energy gain? Yes, the multi-busbar metallization grid collects current more effectively from the cell surface and reduces resistive losses and microcrack risk, resulting in more stable performance under partial shading and lower power degradation over time compared to older busbar designs. ### Are Trina Solar Vertex S Backsheet panels compatible with common hybrid inverters? Yes, a 435 Wp module with standard voltage and current parameters works easily with most string and hybrid inverters on the market, including systems paired with battery storage. The classic backsheet construction also makes it easier to source standard mounting hardware for pitched-roof installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DT-M-A-Datasheet-VertexS-DE09R08-EN-2022-A-web-d583c209647e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +45 W, +2.8 pp, +5 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | Cooler, +2.8 pp, +5 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | Cooler, +2.7 pp, +15 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, cooler, +2.6 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | Cooler, +2.6 pp, +5 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, cooler, +2.6 pp | | [Trina Solar TSM-DE09R.05-405](https://comparepv.com/panel/trina-solar-tsm-de09r-05-405) | 405 W | -15 W, -0.7 pp | | [Trina Solar TSM-DE09R.05-410](https://comparepv.com/panel/trina-solar-tsm-de09r-05-410) | 410 W | -10 W, -0.5 pp | | [Trina Solar TSM-DE09R-415](https://comparepv.com/panel/trina-solar-tsm-de09r-415) | 415 W | Very close match | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, cooler, +4.0 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +75 W, cooler, +3.8 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, cooler, +3.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +70 W, cooler, +3.5 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +80 W, cooler, +3.5 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +80 W, cooler, +3.5 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-de09r-08-420 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.