--- title: "Trina Solar TSM-NEG18R.28-505W Solar Panel: Specs & Prices | ComparePV" description: "Trina Solar TSM-NEG18R.28-505W solar panel: 1 shop offer from 282.46 zł. Specs: 22.70% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/trina-solar-tsm-neg18r-28-505w" image: "https://comparepv.com/og/panel/trina-solar-tsm-neg18r-28-505w.png" updated: 2026-10-28 --- # Trina Solar TSM-NEG18R.28-505W Light for its output, no clear weak spot 435 panels in the segment TOPCon 500-550 W ## Identity - **Manufacturer:** Trina Solar - **Model:** TSM-NEG18R.28-505W - **Series:** Vertex S+ - **Rated power:** 505 W - **Cell technology:** TOPCon ## Price offers Prices are the figure each shop printed, on that shop's side of VAT. | Shop | Market | Price | Per kWp | Availability | Last read | | --- | --- | --- | --- | --- | --- | | [Sklep Soltech](https://comparepv.com/go/5218) | Poland | 282.46 zł net | 559.33 zł/kWp | Not stated | Last read 28 Oct 03:43 | ## How it compares Compared against segment TOPCon 500-550 W (435 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 505 W | 510 W | Typical | | | Module efficiency | 22.70% | 22.74% | Typical | 3,364 | | Power density | 227.1 | 227.4 | Typical | 3,369 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight (kg) | 23.5 kg | 27.0 kg | Strong - top 16% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.70% | 22.74% | Typical | 3,364 | | Power density | 227.1 | 227.4 | Typical | 3,369 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,220 | | Weight per kWp | 46.5 | 52.4 | Strong - top 16% | 1,199 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **46.5 kg per kWp** - Top 16% of the TOPCon 500-550 W segment, against a median of 52.4. - **Best for:** Residential, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 505 W - **Efficiency:** 22.70 % - **Voltage at Pmax (Vmp):** 33.50 V - **Current at Pmax (Imp):** 15.09 A - **Open-circuit voltage (Voc):** 40.30 V - **Short-circuit current (Isc):** 15.89 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:** 227.1 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:** 441 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3364 of 14129 | | Power density | 3369 of 14129 | | Temperature coefficient | 2220 of 14129 | | Weight | 1199 of 14129 | | Warranty | 21 of 14129 | ## About this series The Trina Solar Vertex S+ series are modules designed for rooftops, where yield, durability, and aesthetics are key factors. The key differentiator is the combination of **n-type i-TOPCon cell technology** with the **dual-glass construction**, which uses a second glass sheet instead of a traditional backsheet. This provides better protection against moisture and material aging, performing exceptionally well in more demanding environmental conditions. In practice, this means more stable performance over time and lower risk of degradation compared to older solutions. The Vertex S+ addresses a common challenge for investors: achieving high yield from limited rooftop space without compromising on appearance. Available variants (including the version with enhanced black finish) offer **modern, cohesive aesthetics** for premium homes, while simultaneously maintaining installer-friendly parameters - **compatibility with popular inverters and optimizers**, along with a format that simplifies installation. This is an excellent choice for residential and small commercial installations where long-term quality and predictable energy yield are essential. ## Notable figures - At 22.7% efficiency, this panel is on par with typical \*\*TOPCon 500-550W\*\* modules - Power density of 227.1 W/m² matches the \*\*TOPCon 500-550W\*\* median - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 500-550W\*\* panels - Weight of 23.5 kg (3.5 kg below \*\*TOPCon 500-550W\*\* median of 27.0 kg) allows easier transport and roof mounting - Ranked #3364 out of 14129 panels for efficiency in the database ## Questions ### What is n-type i-TOPCon cell technology in Trina Solar Vertex S+ panels and how does it differ from standard p-type cells? i-TOPCon is an n-type cell technology that reduces light-induced degradation (LID) and temperature-related losses compared to more common p-type cells. In practice this means higher initial efficiency, a slower power decline over time, and better performance on hot rooftops in summer. For homeowners, this translates into higher real-world energy yield across the panel's 30-year service life. ### How many Trina Solar Vertex S+ 510 Wp panels are needed for a 6 kW residential system? With a unit power of 510 Wp, a roughly 6 kW system requires about 11-12 panels, covering approximately 22-24 m² of roof space. That's a real space saving compared to older, less efficient modules, where the same output often required several extra panels. The exact number depends on roof pitch, orientation, and local solar irradiance. ### What warranty comes with Trina Solar Vertex S+ panels and what does it cover? The manufacturer provides a 25-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means that even after 30 years, the module should still deliver a guaranteed, high percentage of its original power. As a Tier 1 manufacturer with a long track record, Trina Solar adds extra confidence that these warranty claims will actually be honored. ### How does the dual-glass construction in Vertex S+ differ from a standard backsheet panel, and is it worth the cost? Instead of a polymer backsheet, the panel uses a second glass layer on the back side, offering better protection against moisture, microcracks, and material aging, especially in harsher climates. Purchase cost is only slightly higher than a backsheet version, but it translates into greater durability and lower failure risk over decades of operation, supporting the 30-year power warranty. ### Are Trina Solar Vertex S+ panels bifacial, generating extra energy from the rear side? No, this Vertex S+ configuration is a monofacial module despite its dual-glass construction. The second glass layer serves a protective function rather than capturing reflected light for extra generation. This is a deliberate design choice by the manufacturer, balancing aesthetics and universal compatibility with sloped roof installations, where bifacial gains would be minimal anyway. ### Is Trina Solar a reliable, trustworthy manufacturer for residential solar panels? Yes, Trina Solar is a China-based manufacturer classified as Tier 1, meaning it has a solid financial standing, in-house production lines, and a long track record of module deliveries worldwide. This status matters practically when filing warranty claims years later - Tier 1 status lowers the risk that the manufacturer disappears from the market and leaves the warranty unenforceable. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DT-M-0088_B_Datasheet_Vertex_NEG18R28_EN_2024_A_web_0-8f95b37ca138.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +2.3 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +2.1 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, +2.0 pp | | [WINAICO WST-505BKX54-A2](https://comparepv.com/panel/winaico-wst-505bkx54-a2) | 505 W | Cooler, heavier, +2.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | +50 W, cooler, +1.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +1.8 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, +1.8 pp | | [Trina Solar TSM-NEG18R.28-475](https://comparepv.com/panel/trina-solar-tsm-neg18r-28-475) | 475 W | -30 W, -1.3 pp | | [Trina Solar TSM-NEG18R.28-480](https://comparepv.com/panel/trina-solar-tsm-neg18r-28-480) | 480 W | -25 W, -1.1 pp | | [Trina Solar TSM-NEG18R.25-485](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg18r-25-485) | 485 W | -20 W, -0.9 pp | | [Trina Solar TSM-NEG18RC.27-490](https://comparepv.com/panel/trina-solar-co-ltd-tsm-neg18rc-27-490) | 490 W | -15 W, -0.7 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | +55 W, cooler, +2.1 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | +45 W, lighter, +1.7 pp | | [JA Solar JAT60S40-540/LR](https://comparepv.com/panel/ja-solar-jat60s40-540-lr) | 540 W | +35 W, cooler, +1.7 pp | | [Gokin GK-5-60HG-540M](https://comparepv.com/panel/gokin-gk-5-60hg-540m) | 540 W | +35 W, cooler, +1.7 pp | | [Jinko Solar JKM545-54QL6-DV-F1-EU](https://comparepv.com/panel/jinko-solar-jkm545-54ql6-dv-f1-eu) | 545 W | +40 W, heavier, +1.6 pp | --- Source: https://comparepv.com/panel/trina-solar-tsm-neg18r-28-505w Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.