LONGi launches 22.3% efficiency back contact PV module

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LONGi's new Hi-MO X6 Artist Ultra Black module with a 22.3% conversion efficiency.
The Hi-MO X6 Artist Ultra Black module generates up to 435W and is aimed at the rooftop solar market. Image: LONGi.

Chinese solar PV module manufacturer LONGi has launched a new black dual-glass back contact module with a 22.3% conversion efficiency.

Presented at Intersolar 2024 in Munich, Germany, the Hi-MO X6 Artist Ultra Black module generates up to 435W and has a 25-year product warranty and a 30-year power warranty. The modules are designed for the residential, commercial and industrial solar markets and are already available for the European market.

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LONGi achieved an all-black appearance through a special glass surface structure and a premium cell process done through automated optical inspection (AOI) during manufacturing of the modules.

LONGi showcased the Hi-MO X6 Artist Ultra Black back contact module at Intersolar 2024. Image: Will Norman.

Moreover, it features the company’s proprietary hybrid passivated back contact (HPBC) cells which allow for a gridless and zero busbar (0BB) front for lossless light absorption. The low reflective texture of the HPBC black cell provides deeper light trapping, reducing reflection and a 1.2% light absorption increase.

According to the company, the lack of shading allows for the light absorption to increase by more than 2% compared to tunnel oxide passivated contact (TOPCon) modules with similar power. This results in a lower levelized cost of electricity.

At Intersolar 2024 in Munich, Germany, LONGi showcased its back contact solar cell, which has a conversion efficiency of 27.3%. Image: Will Norman.

The dual-glass module also has a thicker glass front and Polyolefin Elastomer (POE) film for the module’s encapsulation which provides higher reliability and safety. Improvements in the encapsulant of n-type modules have been one of the challenges the industry has faced in the past few years as explained by solar testing firm PI Berlin (Premium access).

Thicker glass in the front

Other changes from the Chinese manufacturer’s new module is a thicker glass for the front surface which is of 2mm instead of the standard 1.6mm for 54-cell modules. The extra 0.4mm offers a 56% increase bending stress resistance, according to the company.

This allows for the module to withstand wind speeds in excess of 120km/h – the highest level in the Beaufort scale (12) – and heavy snow loads without breaking.

The module also increased its impact resistance against hailstorms – an ever-increasing threat to PV modules globally (Premium access) – and exceeded the IEC standards tests (25 mm hailstones at 23 m/s).

Regarding hailstones, TÜV Rheinland tested the module according to IEC61215-2 with 35 mm hailstones at 110 km/h.

26 November 2024
Málaga, Spain
Understanding PV module supply to the European market in 2025. PV ModuleTech Europe 2024 is a two-day conference that tackles these challenges directly, with an agenda that addresses all aspects of module supplier selection; product availability, technology offerings, traceability of supply-chain, factory auditing, module testing and reliability, and company bankability.
11 March 2025
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The conference will gather the key stakeholders from PV manufacturing, equipment/materials, policy-making and strategy, capital equipment investment and all interested downstream channels and third-party entities. The goal is simple: to map out PV manufacturing out to 2030 and beyond.

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