Energy LONGi

LONGi: the world's largest wafer manufacturer since 2000

The LONGi Green Energy brand: from wafers to finished panels

LONGi Green Energy was founded on February 14, 2000 by Li Zhenguo in Xi'an under the name Xi'an LONGi Silicon Materials Corporation. In 2017, after acquiring photovoltaic module maker LERRI Solar, the company renamed itself LONGi Green Energy Technology, reflecting its expansion from silicon wafer manufacturing to the full photovoltaic module production cycle. The company's stock trades on the Shanghai Stock Exchange, and LONGi is the world's largest manufacturer of monocrystalline silicon wafers — the raw material foundation for the vast majority of modern solar panels, including competitors' products.

The LR8-66HGD series: bifacial panels at 595-625 W

In the "Energy" category, LONGi is represented by bifacial monocrystalline modules in the LR8-66HGD series, from 595 to 625 W. These are high-performance panels with 66 cells and a dual-glass construction, targeting commercial and industrial projects where power density per unit of area and equipment durability are decisive for the investment's economics.

HPBC and HJT technology

LONGi's status as the world's largest silicon wafer manufacturer is a unique competitive advantage unavailable to most other photovoltaic module makers: the company controls the production chain from raw wafer to finished panel, reducing dependence on outside silicon suppliers and potentially delivering more consistent input material quality compared to manufacturers who source wafers on the open market.

LONGi is actively developing HPBC (High Power Back Contact) technology — a cell design where contacts sit on the back of the wafer rather than the front, as in traditional cells. That removes shading of the working surface by contact traces, raising conversion efficiency and improving the panel's appearance thanks to a uniform dark front surface with no visible metal strips — something especially valued in residential projects with higher expectations for roof aesthetics.

Production control, warranty, power steps and how to choose

The company is simultaneously developing HJT (heterojunction) technology — another approach to raising cell efficiency by combining crystalline and amorphous silicon within the junction structure. Having several parallel technology tracks in LONGi's portfolio reflects the scale of R&D investment typical of the industry's largest players.

The bifacial design of the LR8-66HGD series adds output by capturing reflected light off the panel's rear side — a gain especially noticeable at ground-mount stations with a light-colored ground surface or sites with high surrounding albedo, at no extra mounting-area cost.

Warranty terms on LONGi panels typically include separate figures for manufacturing defects and linear power degradation over 25-30 years — standard practice among leading industry manufacturers, worth checking in detail rather than relying on the general service life figure quoted in the manufacturer's marketing materials.

The 5 W power step between adjacent models in the LR8-66HGD series lets you precisely size an array configuration to a system's calculated power requirement, minimizing unused reserve or a power shortfall when planning a large commercial or industrial project.

For a buyer comparing LONGi to other leading manufacturers, control over its own wafer production is a practical argument for supply stability and quality: the company is less exposed to price swings and raw material shortages on the global silicon market than manufacturers dependent on outside wafer suppliers.

It's also worth confirming actual stock levels for a chosen wattage tier before finalizing a project's bill of materials, since a substitution mid-procurement can force a rework of an array's mounting layout on a large installation.

Compare power, warranty terms and technical specs across the LONGi models in the catalogue, and pick bifacial panels from the world's largest manufacturer of monocrystalline silicon wafers, with proven leadership in HPBC and HJT technology, for your commercial or industrial project.