Trina Solar Vertex S+ TSM-520NEG18R.28 520Wp520Wp 108-cell n-type i-TOPCon monofacial dual-glass module

Overview

The TSM-520NEG18R.28 is a single Trina Solar Vertex S+ module of 520Wp and 23.4% efficiency, built from 108 n-type i-TOPCon cells in a 1,961×1,134×30mm dual-glass laminate weighing 23.5kg. Its low-voltage design gives 41.20V Voc and 15.99A Isc, with 34.10V and 15.25A at maximum power, so strings can be long but every inverter input must accept about 16A per string. Trina intends the NEG18R series for commercial and industrial rooftops; it is not for ground-mounted plants.

• 108 n-type i-TOPCon cells, 495–525Wp, up to 23.6%
• Under 2m long, 23.5kg, 1.6mm + 1.6mm glass
• Low-voltage design: Voc about 40–42V, Isc about 16A
• Test loads 5400Pa positive and 2400Pa negative
• 36 modules per box, 864 per 40ft container

Design and technology

The NEG18R.28 is the mid-size Vertex S+ module that Trina Solar positions for commercial and industrial roofs. Its 108 n-type i-TOPCon cells are built on Trina's 210 platform and sit between a 1.6mm anti-reflective front glass and a 1.6mm rear glass, both heat-strengthened. At 1,961×1,134×30mm it stays under two metres long, and 23.5kg keeps it manageable on a roof. The frame is black anodised aluminium and Trina rates it as monofacial.

Electrical data

The global datasheet (2026-A) covers 495–525Wp with a 0/+5W power selection and 22.3–23.6% efficiency; the EU datasheet (2024-C) lists 485–510Wp. Because each module has only 108 cells, open-circuit voltage stays near 40–42V while short-circuit current is close to 16A, so more modules fit in one string at a given inverter voltage. Coefficients are -0.29%/°C (Pmax), -0.24%/°C (Voc) and +0.04%/°C (Isc), with 1500V DC system voltage and a 30A series fuse rating.

Installation notes from the manual

Trina's Vertex user manual lists the NEG18R series among distributed-system products and prohibits ground-mounted power plants. With four clamps on the long frame and rails running across it, the clamp centrelines go in the 315–405mm zone, rated for 2400Pa uplift and 5400Pa downforce; for bolted mounting the holes used are 1300mm apart. Size cables and protection with 1.25 times the marked Isc and Voc, and check that each inverter input accepts the resulting string current of about 20A.

Warranty and packing

Both datasheets give a 30-year power warranty with at most 1% first-year and 0.4% annual degradation, or 87.4% after 30 years. The product warranty differs by document: 25 years on the EU 2024-C datasheet, 15 years on the global 2026-A datasheet that includes the 515–525W classes. Modules are packed 36 per box and 864 per 40ft container, with TS4 Plus, TS4 or MC4 EVO2 connectors depending on the certified version.

Questions and answers