Tongwei Review 2026
Tongwei manufactures 2 models across solar panels. Efficiency range 21.5%–22.5%.
Headquartered in China · Manufacturing in China
Founded 1982 by Liu Hanyuan · Headquartered in Chengdu, Sichuan, China
Parent company: Tongwei Co., Ltd.
Listed: SH:600438
Tongwei at a glance
Certifications: IEC 61215 · IEC 61730 · UL 1703 · CEC Listed
Warranty: 12-yr product · 30-yr performance
Key milestones
- 1982 Founded as agriculture/aquaculture company by Liu Hanyuan
- 2004 Listed on Shanghai Stock Exchange (600438)
- 2013 Entered polysilicon/solar cell manufacturing (Tongwei Solar)
- 2022 Became world's largest polysilicon and solar cell producer
Source: www.tw-solar.com · Last updated 2026-05-27
Tongwei Pros & Cons (data-driven)
+ Pros
- ✓ Average panel efficiency 22% exceeds industry baseline 21%
- ✓ Low annual degradation 0.45%/yr (industry average ~0.5%/yr)
− Cons
- ✗ Distributor and installer pricing varies — direct retail rarely available
- ✗ Some 2026 models depend on regional distributor availability
Pros and cons calculated against industry baselines: 21% panel efficiency, 12yr panel warranty, -0.32%/°C temp coeff, 90% battery RTE.
Current Tongwei Product List (2)
Solar Panels (2)
| Model | Wattage | Efficiency | Warranty | Verified | Score | Details |
|---|---|---|---|---|---|---|
| THN-EP08M10 580W | 580W | 22.5% | 12/25 yr | — | 81 (B+) | View → |
| THN-PE14M10 450W | 450W | 21.5% | 12/25 yr | — | 73 (B) | View → |
Spec Sheet Downloads
No manufacturer-published datasheet links indexed yet for Tongwei. Visit the per-product page for spec details and any source links we have.
Recent Tongwei News
SolarSpec does not republish third-party news. For the latest Tongwei news — product launches, financial filings, recalls, supply-chain updates — search Google News directly.
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Frequently Asked Questions
What is the SolarSpec Score for Tongwei?
Tongwei earns a SolarSpec Score of 77/100 (Grade B) based on the weighted average of all 2 models in their 2026 lineup. The score combines efficiency, warranty, temperature coefficient, and verification status. See our /methodology/ page for the full formula.
How many solar products does Tongwei offer in 2026?
Tongwei offers 2 products in their 2026 lineup: 2 solar panels.
What is the most efficient Tongwei solar panel?
The most efficient Tongwei solar panel is the THN-EP08M10 580W at 22.5% efficiency with 580W output. Tongwei panels range from 21.5% to 22.5% efficiency across 2 models.
What warranty does Tongwei offer on solar panels?
Tongwei offers up to 12-year product warranty and up to 25-year performance warranty. Average annual degradation across the lineup is 0.45%.
Where are Tongwei solar panels manufactured?
Tongwei solar panels are manufactured in China.
How we score brands
Every Tongwei model in our catalog is scored 0-100 using a transparent formula: efficiency (25 pts), product warranty (20 pts), performance warranty bonus (3 pts), temperature coefficient (12 pts), and datasheet verification (5 pts), on a 50-point baseline. The brand-level score is the simple average across all 2 models.
Read the full SolarSpec methodology →