--- title: "Trina Solar TSM-435NEG9R.28 435W Solar Panel - Specs & Review | ComparePV" description: "Trina Solar TSM-435NEG9R.28 435W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/trina-solar-tsm-435neg9r-28" updated: 2026-09-11 --- # Trina Solar TSM-435NEG9R.28 Light for its output, no clear weak spot 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-435NEG9R.28 - **Series:** Vertex S+ N-type i-TOPCon DUAL GLASS MONOCRYSTALLINE MODULE - **Rated power:** 435 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 435 W | 435 W | Typical | | | Module efficiency | 21.80% | 22.00% | Typical | 7,022 | | Power density | 217.7 | 220.2 | Typical | 7,066 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 21.0 kg | 22.0 kg | Strong - top 22% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 22.00% | Typical | 7,022 | | Power density | 217.7 | 220.2 | Typical | 7,066 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 48.3 | 51.4 | Strong - top 22% | 2,138 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **48.3 kg per kWp** - Top 22% of the TOPCon 400-450 W segment, against a median of 51.4. - **Best for:** Residential and commercial. ## Specification ### Electrical - **Rated power (Pmax):** 435 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 43.60 V - **Current at Pmax (Imp):** 9.99 A - **Open-circuit voltage (Voc):** 51.80 V - **Short-circuit current (Isc):** 10.64 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:** 144 - **Bifacial:** yes ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 2.00 m2 - **Power density:** 217.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 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:** 380 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7022 of 14005 | | Power density | 7066 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 2138 of 14005 | | Warranty | 21 of 14005 | ## About this series The Vertex S+ N-type i-TOPCon Dual Glass series is a breakthrough in rooftop module technology, combining compact dimensions with unprecedented durability. The use of N-type cells and innovative i-TOPCon architecture allows for higher efficiency and significantly slower degradation over time, which translates into real energy gains for decades. A key differentiator is the **dual glass layer**, which replaces the traditional backsheet film. This design not only increases resistance to atmospheric factors such as salt, ammonia, or sand, but also completely eliminates the problem of micro-cracks and corrosion. These modules solve the problem of limited roof space, delivering more power from every square meter while maintaining a low weight. **i-TOPCon technology** guarantees excellent performance even on cloudy days, which is crucial in the Polish climate. It is an ideal choice for investors looking for the highest standard of fire safety and a **30-year power warranty**. Vertex S+ distinguishes itself from the competition with a unique combination of aesthetics and extreme mechanical strength, making it the best investment for modern single-family houses and demanding prosumer installations. By choosing this model, you gain the certainty that your installation will remain efficient for generations thanks to **low annual degradation** and a reinforced structure resistant to harsh environmental conditions. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - At 217.7 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 400-450W\*\* panels - Weight of 21.0 kg is typical for \*\*TOPCon 400-450W\*\* panels - In the top 50% for efficiency among all TOPCon panels ## Questions ### Are Trina Vertex S+ N-type i-TOPCon panels suitable for a sloped residential roof? Yes, the Vertex S+ series is designed for residential rooftop installations. The compact module dimensions (approx. 1762×1134 mm) and weight of about 21 kg make handling and installation on standard rafter roofs easier. 144 half-cut cells improve shading tolerance, which matters on roofs with chimneys, dormers, or antennas. ### How does i-TOPCon technology differ from conventional PERC cells? N-type i-TOPCon cells achieve higher efficiency (up to about 22.8%) and are much less prone to LID and LeTID degradation than P-type PERC cells. This results in a lower annual power loss of 0.4% after the first year, delivering higher long-term energy yield, especially 15-20 years into the panel's service life. ### What does bifacial design offer on the Vertex S+, and is it worth the extra cost? Bifacial construction lets the module capture light reflected off the surface behind it, which can boost energy yield by several to over ten percent on light-colored roofs, ground, or elevated racking. On a standard dark roof-tile mount the gain is smaller, but the dual-glass design still allows some rear-side light transmission. ### What warranty applies to Trina Vertex S+ modules, and how much power remains after 30 years? The manufacturer provides a 25-year product warranty and a 30-year power output warranty. Degradation is capped at 1% in year one, then 0.4% annually, meaning the panel should still deliver roughly 87.4% of its rated power after 30 years — among the best figures in the residential rooftop segment. ### Do Vertex S+ panels perform well on cloudy days, typical of the Polish climate? Yes, N-type i-TOPCon cells respond better to weak and diffuse light than conventional PERC cells, so the system generates power more efficiently under low-irradiance conditions. A lower power temperature coefficient also limits output losses on hot days, making the series well suited to Poland's variable weather. ### How does dual-glass construction differ from a standard backsheet, and what are the benefits? Instead of a standard backsheet film, the module uses a second layer of tempered glass, eliminating the risk of microcracks, corrosion, and moisture-, salt-, or ammonia-related degradation. This construction also improves PID resistance and extends real-world service life, though it adds slightly more weight than backsheet versions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Datasheet_-_Vertex_S_NEG9R28_425-460_EN_2024_Aus_C_web-c64fac22102f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +50 W, cooler, +2.5 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +50 W, cooler, +2.5 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +50 W, cooler, +2.5 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +50 W, cooler, +2.5 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +50 W, heavier, +2.5 pp | | [Trina Solar TSM-DE09R.05-405](https://comparepv.com/panel/trina-solar-tsm-de09r-05-405) | 405 W | Hotter, -1.5 pp, -5 yr warranty | | [Trina Solar TSM-DE09R.05-410](https://comparepv.com/panel/trina-solar-tsm-de09r-05-410) | 410 W | Hotter, -1.3 pp, -5 yr warranty | | [Trina Solar TSM-DE09R-415](https://comparepv.com/panel/trina-solar-tsm-de09r-415) | 415 W | Hotter, -1.0 pp, -5 yr warranty | | [Trina Solar TSM-DE09R.08-420](https://comparepv.com/panel/trina-solar-tsm-de09r-08-420) | 420 W | Hotter, -0.8 pp, -5 yr warranty | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +75 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +60 W, cooler, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +70 W, cooler, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +55 W, cooler, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +65 W, cooler, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +65 W, cooler, +2.7 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-435neg9r-28 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.