Lucky Tpcw1 Transparent Solar Backsheet: field notes from the PV supply chain

If you’ve been watching the module BOM shift the past two years (I have, sometimes obsessively), you’ll know that solar backsheets are having a quiet renaissance. Bifacial and light-transmitting designs need optical clarity without losing electrical insulation—easier said than done. Lucky’s Tpcw1 Transparent Solar Backsheet, produced in Baoding (No. 6, Lekai South Street, Hebei, China), aims squarely at that niche with a DuPont Tedlar outer layer and a balanced stack-up that, to be honest, looks well thought-through.

Why transparent solar backsheets now?

Two reasons: bifacial modules keep growing, and glass-glass isn’t always the answer (weight, handling, and cost, especially for rooftop). Transparent solar backsheets offer lighter modules, simpler lamination, and—surprisingly—solid field durability when you pick the right films.

Construction and specs (real-world oriented)

The Tpcw1 uses a weather-resistant outer layer of DuPont Tedlar (transparent PVF), a PET electrical core, and an adhesive/primer system tuned for EVA or POE. It’s the classic PVF/PET stack—but optimized for transmission.

Parameter	Typical (≈) Tpcw1	Notes
Total thickness	285–325 μm	Production tolerance applies
Light transmittance (550 nm)	≥ 88%	Module stack affects net yield
Dielectric strength	≥ 20 kV	Meets 1500 V system designs
Damp heat endurance	85°C/85%RH, 1000–2000 h	Per IEC 61215/61730 protocols
Peel strength (backsheet–EVA)	≥ 6 N/cm	Real-world use may vary
WVTR/Oxygen barrier	Low/medium barrier	Typical for PVF/PET laminates

Process flow, testing, and lifespan

• Materials: transparent PVF (Tedlar) outer; electrical-grade PET core; primer/adhesive systems tuned for EVA/POE.
• Methods: multi-layer extrusion/lamination, corona treatment for adhesion, inline pinhole and surface inspection.
• Testing: IEC 61730 safety; IEC 61215 thermal cycling, damp heat; UV via ASTM G155 xenon arc; insulation > 1500 VDC.
• Service life: designed for 25–30 years under standard PV conditions; site climate will influence outcomes, naturally.
• Industries: utility-scale bifacial, C&I rooftops, agrivoltaics, carports, and—if you ask O&M teams—retrofits where weight matters.

Applications and field notes

We’ve seen transparent solar backsheets shine in bifacial rooftops where glass-glass was simply too heavy. One EPC in Gujarat told me their installers “liked the handling… less breakage.” In an agrivoltaic pilot, the light transmission helped crop shading be, well, gentler. For floating PV, reduce module mass and your pontoons will thank you.

Vendor landscape (quick comparison)

Vendor/Model	Stack-Up	Strengths	Trade-offs
Lucky Tpcw1	PVF/PET (transparent)	High UV durability, good handling, lightweight	Barrier lower than glass-glass
Vendor A (EU)	PVF/PET/PVF	Long field record, broad certifications	Slightly higher cost
Vendor B (CN)	PVDF/PET	Good price/performance	UV stability varies by resin grade

Customization and integration

• Thickness and roll width options (common: 300–1350 mm); MOQ negotiable for pilot runs.
• Adhesion systems tuned for EVA vs. POE; ask for peel test data with your encapsulant of choice.
• Printing/marking layers for traceability; antisoiling coatings on request (project-dependent).

Compliance and documentation

Look for IEC 61730/61215 module certification, ASTM G155 UV exposure data, and electrical insulation reports. Lucky’s team typically supplies COA, RoHS/REACH declarations, and lamination window guidance. Many customers say this prevents 90% of line trials going sideways—my words, but you get the idea.

Mini case study

A 2.8 MW C&I rooftop in North China swapped to Tpcw1 to cut module weight by ≈20% vs. glass-glass. Line yield nudged up after they tightened lamination to a slightly longer dwell (per vendor note). After six months, IR scans were clean and leakage tests stable. Early days, but promising.

Citations

1. IEC 61730: Photovoltaic module safety qualification (latest edition).
2. IEC 61215: Terrestrial photovoltaic modules—Design qualification and type approval.
3. ASTM G155: Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials.
4. UL 61730: PV Module Safety—North America alignment with IEC 61730.
5. DuPont Tedlar PVF Film—Technical resources: https://www.dupont.com/brands/tedlar.html