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LONGi introduced the Hi-MO 9 Prime BC module at Intersolar Europe
The module is specifically designed for utility-scale projects that require high land efficiency and long-term reliability
It has a rated power output of 680 W and an efficiency of 25.2%
Leading integrated solar manufacturer LONGi launched its Hi-MO 9 Prime module based on back-contact (BC) technology at Intersolar Europe 2026. This launch expands the company’s Hi-MO 9 product family targeting utility-scale applications. Based on LONGi’s HPBC 2.0 (Hybrid Passivated Back Contact) cell architecture, the module is rated for a maximum power output of 680 W and 25.2% efficiency.
Built with 132 half-cells, the 2 mm dual-glass module measures 2,382 × 1,134 × 30 mm and has a bifaciality of 75% ±5%. It features a front-side static load rating of 5,400 Pa, a rear-side load rating of 2,400 Pa, an IP68-rated junction box, and a temperature coefficient of -0.26%/°C. The company specifies a first-year degradation of less than 1%, followed by an annual degradation of ≤0.35% through year 30. The module is backed by a 12-year product warranty and a 30-year linear performance warranty.
According to LONGi, the module's high power density enables higher installed capacity within the same project footprint. Based on the company's modeling for a 10-hectare solar project with a 50% ground coverage ratio (GCR), the Hi-MO 9 Prime can increase a project’s installed capacity by 4.62%, from 12.00 MW to 12.56 MW. This results in an additional annual energy yield of about 648.4 MWh and more than €67,000 in annual revenue under the modeled conditions, says LONGi.
Hi-MO 9 Prime incorporates LONGi's Selective Temperature Alloy Connection (STAC) interconnection technology. The lead-free interconnection design reduces thermal stress during manufacturing, improves resistance to electrode corrosion, and minimizes hotspot risks by distributing current more uniformly, claims LONGi.
The company also highlighted the module's partial-shading performance. The parallel cell architecture reduces power losses caused by localized shading from obstacles such as row-to-row shading, dust or leaves. LONGi claims the module reduces power loss under single-cell shading conditions by more than 70% compared to conventional non-BC modules.
