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LONGi Solar: China’s National Institute of Metrology Awards Proficiency Testing Laboratory Certificate to LONGi Module Testing Centre


LONGi has announced that its Module Testing Centre in Taizhou has been awarded Proficiency
Testing Laboratory status by China’s National Institute of Metrology (NIM), the nation’s highest
research facility for measurement science and a national statutory authority in the field of

Under its full name of “Proficiency Testing Program for Measurement of Key Photoelectric
Parameters of Monofacial / Bifacial PV Modules”, the testing program is organized by the NIM
(CNAS proficiency testing provider, PT0037) and the China Quality Certification Center (CQC).
The program covers measurement of photoelectric parameters for high-efficiency PV modules
and aims to compare and verify the technical capacity of relevant laboratories in the PV
measurement and testing field in China to measure key performance parameters under
standard testing conditions. Running from July to November 2020, testing involved a total of
four optional module items (two monofacial and two bifacial), and evaluated a total of 35 major
third-party testing organizations, PV enterprise laboratories and equipment manufacturers.

The procedure involved NIM testing data related to LONGi’s 144mm half-cut wafer size
monocrystalline monofacial PERC module, 72mm full wafer size monocrystalline bifacial PERC
module (front face) and 144mm half-cut wafer size monocrystalline bifacial PERC module (front
face), all in strict accordance with IEC standards 61215-2:2016 and 60904-1:2006. All three
modules were classified as “satisfactory” (the testing has only three classifications –
“satisfactory”, “problematic” and “not satisfactory”), and LONGi performed particularly well
among the participating laboratories.

Over a number of years, LONGi has obtained positive results in proficiency testing, both at
home and abroad:

In May 2018, the company secured TÜV Rheinland laboratory accreditation

In September 2018, the company received certification from China’s National Accreditation
Service for Conformity
Assessment (CNAS), its laboratory then holding double certification qualification in the PV field
in China. In the

same year, LONGi obtained a “Proficiency for Testing of Photoelectric Performance of High-
Efficiency PV Modules”
certification from NIM (CNAS proficiency testing provider, PT0037) and CQC.

In 2019, when the American laboratory RETC issued its “PV Module Index” for the first time,
LONGi became one of
only two companies to receive a “High Achiever” award from among the 46 global companies
participating, due to
its modules’ excellent performance across 18 indexes in terms of reliability, performance and

In 2020, in the “All Quality Matters” Solar Congress hosted by TÜV Rheinland, LONGi received
“Outdoor Energy
Yield” awards in both bifacial and monofacial groups.

Behind LONGi’s achievements is the company’s unswerving commitment to innovation and
sustainable development. As the solar company with the world’s largest market value at present
and a leader in monocrystalline technology, LONGi has been leading the PV industry in the
pursuit of product transformation and LCOE optimization, and the classification of “general
excellence” given to LONGi’s laboratory in the proficiency testing program is recognition of the
company’s product management and laboratory testing capabilities.

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