TW Solar - Solar Panel Reviews

About TW Solar

China's TW Solar, or Tongwei Solar, is one of the largest solar manufacturers in the world.  The company began producing animal feed back in 1983 and began producing solar cells around 2009. By 2013 they were producing them on a large scale. While they first concentrated on producing cells for other companies to use, they have moved into producing their own panels in a big way, becoming a vertically integrated company in charge of all major steps required to manufacture solar panels.

Their Australian office was opened in 2025 and they were sold and installed here for for several years before this, giving them a reasonable Australian track record.

Australian Office

TW Solar's Australian office details are:

Address: Level 25, 100 Mount Street, North Sydney NSW 2060
Phone: 02 8019 7236
Email: [email protected]
Website

If you have a warranty issue, you should first contact your installer.  But if they're no longer around, you can contact the Tongwei office directly.  

Company Info

Tongwei produces polysilicon, cells and solar panels. It supplies cells to many of the world's leading panel manufacturers.

As at June 2025, the company had an annual production capacity for high purity silicon of 450,000 tons, a solar cell production capacity of 150GW and an annual panel production capacity of 90 GW. Tongwei is also a major employer, boasting more than 60,000 employees worldwide.

TW Solar's products are manufactured at a number of facilities in China. One is in Hefei, Anhui province; which has been in operation since late 2013. There are another two in in Chengdu, Sichuan province, and also a factory in Meishan, Sichuan province.

In an example of "co-opetition", TW Solar also teamed up with another Chinese PV manufacturing heavyweight, Trina Solar, on the Tonghe New Energy project. This project involves polysilicon production with an annual output of 40,000 tons, ingot production of 15GW each year, a wafer cutting project (15GW annually), and a solar cell project with an annual output of 15GW.

Residential TW Solar Panels

While its primary focus is on solar cell production, Tongwei also produces solar panels for residential, commercial and utility-scale applications. TW Solar panels available and approved for use in Australia are listed on the Clean Energy Council's approved solar module list under the company name of "Tongwei Co Ltd". 

While Tongwei Solar produces a large range of solar panel models, you can expect those sold for residential use in Australia to have these characteristics:

• Panel efficiency of around 22% to 23.5%
• Temperature coefficient of PMAX (heat resistance) of -0.28%
• A product warranty of 25 years
• A 30 year performance warranty allowing 1% loss of output in the first year and 0.4% in subsequent years

These characteristics are similar to those of other decent quality, lower cost panels on the market.  Provided the TW panel you're offered has a product warranty of 25 years, its other features are likely to be up-to-date.  

In October 2025, TW Solar announced the release of its 470-Watt TWMNH-48HE470 module, which is a a full-black monofacial dual-glass solar panel with a footprint of 2m2. The panel is cyclone-rated and hail impact tested to 44.9 mm hailstones at 110 km/h. The standard IEC hail test involves 25 mm hailstones at 82.8 km/h.

Tongwei Solar also produces bifacial panels with glass sheets covering the top and bottom of the panel. This allows them to use light hitting either side.  While there's no real advantage from installing bifacial panels on a roof, there's no disadvantage.

If you've had TW Solar panels installed on your rooftop, let us know your opinion of them by leaving a review.