RenewSys has launched its PRESERV 300 TF SB series transparent backsheet for TOPCon modules
The outermost layer of the backsheet reduces soiling and yields additional generation
This polymer-based backsheet reduces the weight of the TOPCon module, making it suitable for low-load-bearing rooftop projects
India-based PV backsheet, encapsulant, cell, and module maker, RenewSys India Pvt. Ltd., has expanded its portfolio of fluoropolymer-based transparent backsheet by launching the PRESERV 300 TF SB.
The company primarily promotes this rear-side substrate as a ‘lightweight’ and moisture-resilient alternative to rear glass of TOPCon modules. Rear glasses, which have the lowest water vapor transmission rate (WVTR) compared to backsheets, are generally preferred due to TOPCon modules’ moisture-induced degradation. However, it increases the module’s weight and cost. It also makes installation difficult, particularly for residential and commercial & industrial (C&I) rooftop projects. On top of that, these projects often face constraints on space, material movement, and roof load.
RenewSys’s backsheet comprises a laminated stack of primer-adhesive-PET-adhesive-fluoropolymer, from cell to airside, respectively. While not divulging its thickness details, the company says this structure creates a barrier with a rated WVTR below 0.35 g/m²/day, minimizing rear-side moisture ingress. This, in turn, protects the cell’s metal electrodes from oxidation and subsequent formation of acetic acid by chemically reacting with embedded encapsulants. Eventually, it reduces the risk of corrosion in modules. Besides, the outermost layer, fluoropolymer, which exhibits low adhesion to dust particles, reduces soiling and makes cleaning easier, compared to other backsheet types. Thus, it helps generate additional power from the rear side. It is also lighter than glass-glass PV modules, making it suitable for low-load-bearing roof installations and easier to install.
The company’s official LinkedIn post, however, didn’t provide data on dimensions, peel strength, elongation threshold, or tensile strength.