TCL SunPower, a business unit of Chinese PV manufacturer TCL Zhonghuan, has launched the TCL Solar T5 Pro series, a new shingled TOPCon solar module range combining multi-cut cell technology with an overlapping shingled architecture. Announced on May 21, 2026, the product line targets commercial rooftop and ground-mounted installations and carries direct relevance for HVACR engineers managing building-integrated solar programmes.
The T5 Pro product line combines TOPCon multi-cut cell technology with a shingled design that eliminates inactive gaps on the cell surface, enabling greater light capture, with an optimised circuit design ensuring stable performance under partial shading conditions.
Two Formats for Two Markets
The series comes in two versions: the T5 Pro S, rated at 450 W to 475 W for rooftop applications, and the T5 Pro L, rated at 640 W to 670 W for large rooftop and ground-mounted projects.
Both share a temperature coefficient of minus 0.26% per degree Celsius, a first-year degradation of 1%, an annual degradation of 0.35%, a 25-year product warranty, and a 30-year performance warranty. Front-face mechanical load tolerance reaches 5,400 Pa, suitable for heavy snow and high-wind rooftop environments.
The T5 Pro S measures 1,622 mm x 1,134 mm, weighs 24.5 kg, and uses 2.0 mm heat-strengthened glass in a black anodised aluminium frame with an IP68-rated junction box rated for operation from minus 40 to plus 85 degrees Celsius.
The Thermal Advantage That Matters for Building Professionals
The T5 Pro’s low-current tri-cut architecture keeps maximum hotspot temperatures 45°C lower than conventional TOPCon modules and reduces average daily operating temperatures by 1 to 1.5°C, directly lowering fire risk on occupied commercial rooftops.
For HVACR professionals, this is the specification that matters most. Commercial rooftops shared with AHUs, cooling towers, and condensing units create partial shading and localised heat zones that punish conventional modules. Independent TÜV Rheinland testing confirms the T5 Pro generates 17% more energy than conventional modules under partial shading, with power retention of 67% versus roughly 50% for standard half-cell modules.
Cell Architecture: Why the Numbers Stack Up
The tri-slice design divides each full-size wafer into three sub-cells assembled in a zero-gap matrix, boosting output by more than 15 W and raising module efficiency by over 0.5 percentage points while maintaining a standard footprint. Each sub-cell operates at 5.09 A, reducing resistive losses to 1.3 W, which is 74.5% lower than conventional half-cell modules.
The 85% bifaciality factor allows the rear face to contribute additional energy from reflected and diffuse irradiance, supporting the up to 24.8% headline module efficiency figure.
Commercial Case: Lower Costs, Higher Yield
For a 0.7 MW commercial rooftop project, the T5 Pro reduces balance-of-system costs by 2.63%, cuts levelised cost of energy by 0.66% to 1.82%, and increases full-lifecycle energy yield by 4%.
A lightweight variant weighing just 5.4 kg per square metre opens up older commercial rooftops with limited load-bearing capacity, delivering 3 to 6% more power generation than conventional modules of equivalent footprint.
Durability Confirmed
The T5 Pro has passed IEC salt-mist level-8, ammonia, and sand-abrasion testing, recording just 0.22% degradation after combined mechanical load, thermal cycling, and damp-freeze trials, far below the industry 5% benchmark.
Strategic Context
TCL SunPower will debut its next-generation back contact technology alongside the T5 Pro at SNEC in Shanghai and Intersolar Europe in Munich in June 2026, confirming the T5 Pro as part of a broader technology portfolio push that spans residential, commercial, and utility-scale markets globally.
