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review.solar · Warranty summary
Vertex N NEG21C.20
700–725 W · N-type TOPCon · Dual-glass
Trina Solar
12-year product warrantyGlobal
Reviewed 2026-06 · Document PS-M-0135 Rev. X (February 2024)
62/100
Fair
Guarantee & backbone
About this document
review.solar’s plain-language summary of the manufacturer’s warranty terms as at the review date. Not a legal instrument: verify current terms with the manufacturer before making a claim.
12yr
Product warranty
30yr
Performance warranty
87.4%
Output at end of term

Performance guarantee: 30-year linear output

80859095100Guaranteed floor 87.4%Product 12yr87.4%0yr5yr10yr15yr20yr25yr30yr
Projected outputGuaranteed floor: 87.4% at yr 30Product warranty ends yr 12
The guarantee
  • 12-year product warranty
  • 30-year linear performance warranty
  • Material and workmanship defects
  • Backside power output (bifacial)
  • Remedy options
What voids or limits it
  • Labour and reinstallation
  • Cosmetic deterioration
  • Improper installation or operation
  • External damage
  • Australia: authorised resellers only
  • Parallel imports
How to claim
Lodge claims through Trina's Customer Service Portal at customerservice.trinasolar.com within two months of discovering the defect, with proof of purchase, product description, detailed defect descrip Full summary, conditions and sources: page 2.
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review.solar/warranties/trina-solar-vertex-n-n-type-i-topcon-tsm-neg21c-20-725w
© Solar Analytica 2026
Page 2 · Complete warranty summaryVertex N N-type i-TOPCon TSM-NEG21C.20 725W
Warranty period
12-year product warranty
Trina Solar warrants the TSM-NEG21C.20 against defects in materials, workmanship, and manufacture that materially impede power generation for 12 years from the warranty start date: the earlier of initial installation or three months after delivery. Glass breakage is covered unless caused by an external event.
30-year linear performance warranty
Front-side power output of the TSM-NEG21C.20 is guaranteed for 30 years: maximum first-year degradation 1.0%, maximum annual decline 0.4% from year 2, and no less than 87.4% of nameplate output at end of year 30, measured under Standard Test Conditions.
What’s covered
Material and workmanship defects
Covers defects in materials, workmanship, or manufacture that materially impede power generation throughout the product warranty, including glass breakage from the glass or module itself, but not from external causes.
Backside power output (bifacial)
As a bifacial dual glass product under section 1(g)(iii) of the Global Limited Warranty, the TSM-NEG21C.20 carries a 30-year backside power warranty. Backside power degradation must not exceed 15% of initial backside power within the first 10 years, and must not exceed 30% from years 11 to 30.
Remedy options
Trina Solar may, at its sole discretion, repair the defective product, replace it with an equivalent or successor model of equal or greater nameplate power, supply additional modules to compensate for the measured power shortfall, or refund the salvage or pro-rata value of the affected modules. Trina Solar bears direct repair costs and freight to the buyer during the warranty period.
Exclusions
Labour and reinstallation: Removing, handling, repacking, and reinstalling modules is explicitly excluded; these costs remain with the buyer for the entire warranty period.
Cosmetic deterioration: Scratches, stains, mechanical wear, rust, mould, deformation, or discolouration occurring after delivery are not considered defects under this warranty.
Improper installation or operation: Modules installed or operated contrary to Trina Solar's user manual, by unqualified persons, or in conditions outside the rated environmental specifications are not covered.
External damage: Damage from force majeure events including storm, hail, lightning, flood, fire, or other events beyond Trina Solar's control are excluded.
Australia: authorised resellers only: In Australia, the Global Limited Warranty is only valid for products purchased from Trina Solar's authorised Australian resellers.
Parallel imports: Products sold into Australia from another country without Trina Solar's consent are excluded from warranty coverage.
Transferability
Transferable provided the modules remain at their original location and have not been moved or disassembled since installation; any subsequent property owner qualifies as warranty holder on those terms.
How to make a claim
Lodge claims through Trina's Customer Service Portal at customerservice.trinasolar.com within two months of discovering the defect, with proof of purchase, product description, detailed defect description, serial numbers of all affected modules in editable format, and photographic evidence. Australian service centre: Trina Solar (Australia) Pty Ltd, Suite 44.05, Level 44, Governor Philip Tower, 1 Farrer Place, Sydney NSW 2000; phone 1300 874 627; email Australiaservice@trinasolar.com.
Source reference
DocumentGlobal Limited Warranty for Trina Solar Brand Crystalline Solar Photovoltaic Modules
Version at auditPS-M-0135 Rev. X (February 2024)
Sourced byreview.solar, 2026-06
Manufacturertrinasolar.com

review.solar · complete warranty summary · review.solar/warranties/trina-solar-vertex-n-n-type-i-topcon-tsm-neg21c-20-725w · © Solar Analytica 2026