BC cells lead on performance
Back-contact (BC) cells drew serious buzz at Intersolar, topping the performance charts and outpaced rivals such as Topcon. Euronergy, for example, presented a new lightweight BC module using composite materials instead of glass. At just four kilograms per square metre, the modules are ideal for rooftops with tight weight budgets – without compromising fire safety. Our test footage from Stuttgart back up these claims and we can confirm that the panels are also well suited for façades.
Back-contact modules – the next step in solar power
The BC modules use IBC cells fully contacted on the rear via copper foil, while an insulating layer separates the poles, helping reduce hotspot risk. “The foil draws heat away from stress points,” explains Martin Green, Head of Development. Thanks to the full-surface contact, current bypasses cracked zones, meaning output remains stable even in the event of microcracks.
Euronergy also offers colour-customisable versions, opening up use in design-sensitive spaces. Italian manufacturer Futuresun has taken this further with its Silk module line, which features multi-tonal and metallic finishes.
Perovskite promise inches forward
Perovskite remains a buzzword, though not yet a product category. Commercial modules are still at least two years out and lab teams have plenty of late nights ahead. Qcells, however, claims a breakthrough: its lab samples recently passed durability tests, marking a significant step on the path to market maturity.
Perovskite – Oxford PV and Trinasolar sign patent agreement
Sonnenstromfabrik (CS Wismar) showcased a 540 W tandem cell module based on Oxford PV’s perovskite tech – a forward-looking teaser of what’s to come. The company, now part of Centrotec Industries, also introduced the Black Contact glass-foil module (505 W) and a selection of Sapphire Color variants, including terracotta. All offer aesthetic appeal and 30-year guarantees.
Aiko bets on connectivity
Aiko’s Navigator module integrates Power Line Communication. Its junction box sends performance data over the DC line to a cloud-linked gateway, enabling module-level monitoring. While similar outcomes can be achieved using DC optimisers, with added features including shutdown and shade-tolerance, the dual-cloud model raises eyebrows as well as questions around cybersecurity. Whether it gains traction in Europe remains to be seen.
AIKO supplies N-type BC modules for Bosnia’s largest solar plant
The company’s Infinite series does not transmit data but boasts higher yields than Topcon modules. Rear-only contacts expand the aperture area by nearly five percent, giving a 30-40 W edge per panel. Aiko signed several supply deals during the fair with installers, EPCs and major distributors such as Krannich, Segen and Dachdecker Einkauf Süd.
Longi launches Himo 9 and Himo 10
Longi debuted the Himo 9 series using second-gen HPBC cells – no busbars, full passivation, and output up to 670 W. With 24.8 percent efficiency and over 80 percent bifaciality, the modules outperform Topcon by roughly 6.4 percent. This is especially relevant for tighter project budgets.
Longi – a road map to ongoing innovation
The new Himo 10 range targets higher-spec niches. The S10 variant for private customers combines a compact 54-cell design with 515 W output (252.3 W/m²) and 25.2 percent efficiency. A 30-year product and performance guarantee is included. Himo 10 received an Innovation Award at the show.
Glass-glass and German returns
Winaico rolled out its new bifacial glass-glass WST-NCX48 modules: 460 W in standard black, 450 W in full-black. The 25 kg units feature monocrystalline N-type cells and come with a 30-year warranty. Despite using just 2 mm glass, the modules are certified for hail and mechanical loads, making them not just pretty, but tough too.
And the winner is… your solar business
German manufacturers were notably few at this year’s event, making Sonnenstromfabrik’s return all the more eye-catching. Its new offerings, both technical and aesthetic, signal a welcome uptick in domestic module development. (HS/TF)
