Plain explanation
In July 2026 Qcells announced that TÜV Rheinland confirmed its 2-terminal perovskite-silicon tandem modules passed the IEC 61215-2:2021 and IEC 61730-2:2023 test sequences (plus the UL versions), using the IEC TS 60904-1-1 power measurement rules for multi-junction modules. Those modules came from its R&D pilot line, not mass production. GCL's perovskite unit says its 4-terminal tandem modules have passed IEC 61215 and IEC 61730, with a production line ramping in 2026 and first customer shipments of tens of MW. Oxford PV states a 10-year product and performance warranty on its Gen 2 tandem modules and expects volume manufacturing from 2027. So certification is real progress, but certificates are per model: check that the exact model on the quote is listed. Also compare the warranty length and the field track record, which is still short. Waiting a year also means losing a year of output from the roof.
Steps from the source
- Ask for the IEC 61215 and IEC 61730 certificates of the exact model and edition, not a press release
- Compare product and performance warranty years with your usual silicon module
- Check real availability and lead time before promising tandem in a quote
- Only on very small roofs where every m² counts does the higher efficiency matter much; otherwise quote proven silicon now
"The core of this latest achievement by Qcells involves successfully passing the type approval and safety testing sequences outlined in International Standards IEC 61215-2:2021 and UL 61215-2:2021, along with Standards IEC 61730-2:2023 and UL 61730-2:2022."
Word for word from the source.
Source
Where installers ask this
General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.