Chinese solar module manufacturer Longi has launched today a new back contact (BC) panel at the Smarter E trade show in Munich, Germany.
“This new product incorporates a redesigned cell architecture compared with the previous generation, utilizing an advanced stacking technology that maximizes the module’s active surface area by eliminating gaps between cells,” the company’s product manager, Miki Risita, told pv magazine. “The approach is comparable to shingled-cell designs but significantly reduces mechanical stress between cells, enhancing long-term reliability. In addition, the module features concealed busbars, further increasing the active area available for power generation and contributing to higher overall efficiency.”
The Hi-MO 9 Prime series relies on the company’s hybrid passivated back contact (HPBC) cell technology and the Selective Temperature Alloy Connection (STAC) technology, which the company said minimizes localized thermal stress during manufacturing and significantly improves long-term, cell-level stability. “Its sustainable, lead-free material design also enhances resistance against electrode corrosion, while the specialized BC cell interconnection structure helps disperse current concentration to reduce hotspot-related risks,” Risita added.
. It is offered with power ratings ranging from 650 W to 680 W and reaches a maximum module efficiency of up to 25.17% in its highest-power configuration. The modules are built with 132 half-cut back-contact cells, measure 2,382 mm × 1,134 mm × 30 mm and weigh 33.5 kg.
The dual-glass panels are designed for a maximum system voltage of 1,500 V and are suitable for utility-scale and commercial PV installations.
The product features a temperature coefficient of -0.26%/C and is rated for front-side snow and wind loads of up to 5,400 Pa and rear-side loads of 2,400 Pa. The module is also certified to withstand hail impacts from 25 mm ice balls travelling at 23 m/s.
“Beyond delivering higher baseline power, the Hi-MO 9 Prime delivers superior partial shading tolerance to protect those revenue streams. Its highly parallel BC cell structure helps drastically reduce electrical losses caused by localized shading from row-to-row obstructions, dust, fallen leaves, or other temporary objects,” the manufacturer said in a statement released. “When a single cell is shaded, the Hi-MO 9 Prime can reduce power loss by more than 70% compared with conventional non-BC modules. This supports far more stable, predictable energy generation in high-GCR configurations and complex, real-world operating environments.”
“Commercial production is scheduled to begin later this year,” Risita stated. “The company has already secured initial orders for delivery toward the end of 2026, with production volumes expected to ramp up at the start of the first quarter of 2027.”
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