LONGi showcased its advanced Hi-MO 9 series HPBC 2.0 cell technology-based module, rated at 670 W and 24.8% efficiency
Also on display was its latest HIBC cell-based module, featuring more than 700 W of power and 25.9% efficiency
Additionally, the company highlighted its mainstream product, Hi-MO X10 Guardian series
The pursuit of theoretically achievable efficiency limits in back-contact (BC) cell technology has prompted several leading PV manufacturers to develop innovative BC architectures based on various mainstream cell technology platforms. For example, LONGi is actively advancing multiple BC-based approaches, including its proprietary HPBC, HBC (built on HJT architecture), and HIBC structure.
Leveraging the international platform of SNEC 2025, the company highlighted the successful commercialization of its technological advancements at both the cell and module levels, particularly along the BC technology route. During a short interview with Shravan Chunduri, Head of Technology at TaiyangNews, LONGi’s Product Marketing Expert, Charles Cheng, provided an overview of the company’s latest Hi-MO 9 series module, featuring HPBC 2.0 cell technology.
Cheng spoke about the latest model from the series, LR8-66HYD, displayed at the company’s stall. Featuring 132 HPBC 2.0 half-cells, the module is rated for a maximum power and efficiency of 670 W and 24.8%, respectively. According to its datasheet, this latest Hi-MO 9 version delivers a power gain of more than 6.5% compared to its predecessor. In addition to the front-side 0BB gridline-free architecture, this gain can be attributed to the company’s TaiRay silicon wafer-based HPBC 2.0 cell’s higher low-light performance for an extended duration compared to its previous generation. In addition, this module features a bifaciality of up to 80%. Built with 2 mm-thick front and rear glass and measuring 2,382 × 1,134 × 30 mm, this product weighs 33.5 kg, making it suitable for utility-scale applications.
Given the low breakdown voltage of BC cells, the module has an anti-shading property, which facilitates bypassing of partially shadowed cells instead of a full substring. This characteristic earns additional power, which would have been wasted in traditional half-cut cell-based modules. Mitigating the potential risk of module mechanical failure due to heavy snowfall or high wind flow, it has been certified for a maximum front-side mechanical load of 5,400 Pa and 2,400 Pa on the rear. Cheng says that the embedded TaiRay wafer’s higher mechanical strength and rear side cell interconnection architecture enhance the product’s resilience against potential micro-crack generation during heavy mechanical stress.
According to Cheng, this Hi-MO 9 series product can be tailored for diverse application scenarios – desert, offshore PV, and hailstorm-prone sites.
Dante Zeng, Product Marketing Manager at LONGi, took over from Cheng to share some insights about the company’s latest HIBC PV module. Featuring HIBC cells, this module has a rated power output of over 700 W and an efficiency of up to 25.9%. According to its press release, LONGi recently achieved a lab-scale efficiency of up to 27.81% for its HIBC cell, substantiated by Germany’s Institute for Solar Energy Research Hamelin (ISFH).
Performance
According to the press release, the high efficiency can be attributed to advanced high-density packaging technology, which enables a cell matrix screen-to-body ratio of 95.1%, compared to the 93.2% seen in conventional modules. This increase enhances the active light-absorbing area, contributing to improved efficiency.
Alongside the high efficiency, this module has delivered more than 700 W of power in a 2,382 × 1,134 mm size, compared to the industry-standard 2,384 × 1,303 mm, resulting in a power density of 259 W/m², which is up to 34 W/m² higher than its larger counterparts. This high power density can be attributed to the HIBC cell’s superposition of HJT high-quality passivation technology on BC technology, emphasized LONGi.
Reliability
In line with the characteristics of HIBC cell technology, this module incorporates high water-resistance PV materials, while exhibiting more than 4 times water vapor attenuation resistance compared to its TOPCon counterpart. This feature, the company says, makes the module suitable for long-term operation in highly humid environments. Plus, its low temperature coefficient of -0.24%/°C can ensure up to 3% higher power generation. In addition, due to the low reverse breakdown voltage characteristics of the BC cell structure, this module can reduce potential power losses by up to 70% during partial shading conditions compared to a conventional half-cell counterpart, claims LONGi. While supporting power gain, this HIBC cell-based module also mitigates the potential risk of fire generation stemming from hotspot generation due to extended partial shading events.
Designed with a frame under a module dimension of 2,382 x 1,134 mm, this product exhibits good corrosion resistance. It can withstand mechanical loads of up to 6,000 Pa and 3,600 Pa on the front and rear sides, respectively. Also, the HIBC cell, built with LONGi’s TaiRay wafers with higher mechanical strength, along with the ‘I’-shaped welding strip design in place of round or multiwire ribbon, reduces the stress on the edge of the BC cells by 48%. These features enhance the module’s resilience against the formation of hidden cell cracks, noted the company.
Zeng also highlighted the Hi-MO X10 Guardian Series LR7-72 HVHF model on display, equipped with HPBC 2.0 cell technology. This monofacial module, consisting of 144 pieces of BC half-cells, boasts a power output of up to 670 W and an efficiency of up to 24.8%. Sized at 2,382 × 1,134 × 30 mm and laminated with 3.2 mm-thick front glass, this module weighs 28.5 kg. Designed with a unique frame with no front edge along the short side length of the module, it has an anti-dust property, supporting power gain. It makes it suitable for C&I color steel tile roofs and low-angle installation scenarios, says the product datasheet. Alongside the anti-dust property, this module features anti-shading and fire-prevention characteristics, noted Zeng.
This module is a mainstream product for LONGi this year, which could achieve over 70 GW of production volume, claimed Zeng.