As the global energy structure accelerates its transformation toward clean energy, the photovoltaic (PV) industry, a core pillar in the renewable energy sector, is embracing dual opportunities of large-scale expansion and high-quality development. As a critical tool for quality control of PV modules, portable electroluminescence (EL) inspection equipment, leveraging its core advantages of lightweight design, high adaptability and precision, has expanded from traditional laboratory testing scenarios to cover the entire industrial chain, including power station acceptance, operation and maintenance (O&M) inspections, and incoming material verification. Based on the current development trend of the PV industry, technological innovation direction, and changes in market demand, this report comprehensively analyzes the market status, driving factors, competitive landscape and future prospects of portable EL inspection equipment, providing decision-making references for industry participants.
Driven by the global "dual carbon" goals, the scale of PV installed capacity continues to climb. According to industry data, the global PV inspection market size is expected to exceed USD 4.7 billion in 2025. As the world's largest PV producer and consumer, China accounts for nearly 60% of the global market, emerging as the core demand market for portable EL inspection equipment. The PV industry has shifted from a stage of high-speed growth to high-quality development. Module quality directly determines the power generation efficiency and lifecycle revenue of power stations. This transformation has driven the upgrade of inspection demand from traditional laboratory static testing to full-scenario dynamic testing.
Meanwhile, the explosive growth of distributed PV has become a key driver for the rising demand of portable EL inspection equipment. Compared with centralized power stations, distributed PV features scattered application scenarios, complex installation environments and small unit capacity, making traditional benchtop EL inspection equipment unable to meet the needs of on-site rapid testing. Endowed with advantages such as lightweight design (usually less than 1kg), easy operation and all-weather adaptability, portable EL inspection equipment has become a standard tool for distributed PV acceptance and O&M, promoting the extension of inspection services from the "factory end" to the "power station end" and "on-site end".
The PV EL inspection equipment market is divided into two major categories: benchtop and portable. Benefiting from scenario adaptability, portable equipment has achieved a growth rate significantly higher than the industry average. In recent years, the global PV EL tester market has maintained steady growth, with a compound annual growth rate (CAGR) of over 12% from 2020 to 2025. It is projected that by 2031, the global market size will exceed USD 2 billion, among which the proportion of portable equipment will rise from 45% in 2025 to over 60% in 2031. The Chinese market has shown particularly outstanding performance. Driven by the surge in distributed PV installed capacity and the standardization of power station O&M, the market size of China's portable EL inspection equipment is expected to exceed RMB 1.2 billion in 2025, with a CAGR of 18%.
The global portable EL inspection equipment market presents a competitive pattern of "international brands dominating the high-end market and local enterprises seizing the mid-to-low-end market". Represented by Ecoprogetti (Italy) and DENKEN (Japan), international brands occupy an advantageous position in the high-end module inspection field by virtue of advanced optical imaging technology and mature algorithm systems. Local enterprises, including Suzhou Zhisheng, Shanghai Optosolar, Suzhou Lakes and Shichuang Intelligence, have gradually expanded their market share relying on cost control capabilities, rapid scenario response capabilities and comprehensive localized services.
Current market competition has formed two core paths. First, "specialized equipment suppliers" represented by Shichuang Intelligence, focusing on improving equipment accuracy and stability, devoting themselves to core technology R&D, accumulating a number of patented technologies, and covering leading module manufacturers and large-scale power station owners with their products. Second, "scenario solution providers" represented by Trina Solar and LONGi Green Energy, relying on their own advantages in the entire PV industry chain, developing inspection equipment deeply integrated with production and O&M systems to achieve data interconnection and quality traceability.
The technological iteration of portable EL inspection equipment focuses on three major directions. First, intelligent upgrading: equipped with AI large models and industrial vision algorithms, it can automatically identify defects such as cracks, broken grids, microcracks and chips with micron-level accuracy, replacing more than 85% of manual judgment work and greatly improving inspection efficiency. Second, multi-function integration: integrating three core functions including daytime EL, daytime PL and nighttime EL, it is suitable for full-scenario testing under sunlight, moonlight and rainy days, compatible with module and string measurement, and meets multi-scenario needs. Third, optimization of lightweight design and portability: the equipment weight is controlled within 1kg, paired with an 11-inch Android tablet for operation, supporting GPS positioning, barcode entry and cloud data export, suitable for field inspection scenarios.
Countries around the world have strengthened the quality supervision of PV products, issued stringent access standards and testing specifications, promoting the popularization of portable EL inspection equipment. The number of international PV testing standards led by China continues to increase, covering multi-dimensional indicators such as module efficiency, durability and defect detection. Europe has strengthened PV module quality requirements through CE certification, triggering explosive demand for inspection in old power station renovation. The U.S. Inflation Reduction Act mandates that authoritative EL inspection reports must be provided for power station acceptance. Mandatory policy requirements have made portable EL inspection equipment an essential tool for compliance acceptance of PV projects.
On one hand, the proportion of distributed PV continues to rise. The global distributed PV installed capacity is projected to increase from the current 30% to 40% in 2025. The decentralized characteristics of household and commercial rooftop projects directly drive the demand for portable inspection equipment. On the other hand, the large-scale mass production of new battery technologies such as TOPCon, HJT and perovskite/silicon tandem has led to more complex defect types of new modules, putting forward higher requirements for the accuracy and compatibility of inspection equipment, and driving the upgrading of portable EL equipment toward hyperspectral imaging and multi-technology integration. In addition, the increasing dependence of PV power station financing and insurance on third-party testing has further expanded the market demand for inspection equipment.
The deep integration of industrial vision, artificial intelligence, Internet of Things (IoT) technologies with inspection equipment has become the core driving force for the upgrading of portable EL equipment. The optimization of AI algorithms has increased the defect recognition rate to over 95%, and can realize predictive maintenance through big data analysis. IoT technology enables real-time uploading, cloud storage and remote analysis of inspection data, forming a data closed loop with smart O&M platforms. The application of hyperspectral imaging technology allows the equipment to clearly capture micro-defects, meeting the inspection needs of high-efficiency battery modules. Technological innovation not only improves equipment performance, but also expands the business model of "inspection + data services".
The core components of high-end portable EL inspection equipment (such as near-infrared high-sensitivity lenses and hyperspectral imaging modules) and AI algorithms are still monopolized by some international brands. Local enterprises face the problems of large investment and long cycle in core technology R&D, making it difficult to achieve a comprehensive breakthrough in the high-end market in the short term. In addition, the inspection technology for new modules such as perovskite is still in the exploratory stage, and enterprises need to continuously invest in R&D to adapt to the needs of technological iteration.
At present, there is no globally unified standard for defect judgment criteria and inspection accuracy thresholds of portable EL inspection equipment. The inconsistency of test results of equipment from different manufacturers leads to obstacles in cross-regional mutual recognition of inspection reports. This problem is particularly prominent in international trade scenarios, restricting the export expansion of local equipment.
With the release of market demand, more and more enterprises have entered the field of portable EL inspection equipment, resulting in intensified homogeneous competition in the mid-to-low-end market. Some small and medium-sized enterprises seize the market through low-price strategies, leading to a decline in the industry average profit margin from 35% in 2020 to 22% in 2025. Leading enterprises also face dual pressures of cost control and technology investment.
In-depth Intelligent Upgrading: AI algorithms will upgrade from "defect identification" to "performance prediction", predicting module attenuation trends through analyzing inspection data and providing preventive maintenance suggestions. The equipment will integrate more sensors to realize multi-technology integrated testing combining EL inspection, infrared thermal imaging and IV curve testing.
Accelerated Localization Replacement: Local enterprises continue to make breakthroughs in core component R&D and algorithm optimization. It is expected that in the next 5 years, China's portable EL inspection equipment will increase its global market share from 70% to 85%, and the localization rate in the high-end market will exceed 50%.
Business Model Innovation: Shifting from single equipment sales to integrated solutions of "equipment + inspection services + data subscription". Third-party inspection institutions cooperate with equipment suppliers to launch service models such as pay-per-test and annual O&M testing, enhancing customer stickiness.
Further Scenario Expansion: Expanding from PV module inspection to new scenarios such as building-integrated photovoltaics (BIPV), agrivoltaics and floating photovoltaics, developing portable equipment suitable for special environments, such as outdoor-specific models with high protection level and long battery life.
Benefiting from the continuous expansion of the PV industry, the upgrading of inspection demand and the drive of technological innovation, the portable EL inspection equipment market will maintain a high-growth momentum. It is projected that from 2025 to 2031, the global portable EL inspection equipment market will maintain a CAGR of 15%-20%, with the market size exceeding USD 3.5 billion by 2031; the Chinese market will achieve a CAGR of 18%-22%, with the market size exceeding RMB 4 billion by 2031.
In terms of regions, the Asian market will continue to dominate global demand. Driven by the growth of PV installed capacity and the popularization of distributed PV, regions such as China, India and Southeast Asia will become core growth poles. The European and North American markets will maintain a growth rate of over 12% benefiting from old power station renovation and tighter policy supervision. The potential of emerging markets such as the Middle East and Africa will be gradually released, with their incremental contribution expected to exceed 20% after 2025.
As a core supporting tool for the high-quality development of the PV industry, portable EL inspection equipment is in a golden development period with overlapping policy dividends, industrial demand and technological innovation. Despite facing challenges such as core technical barriers and inconsistent standards, with the acceleration of localization replacement, the deepening of intelligent upgrading and business model innovation, its market size will continue to expand and application scenarios will be continuously broadened. In the future, enterprises with core technological advantages, scenario adaptability and integrated service capabilities will occupy a dominant position in the market competition. Portable EL inspection equipment will not only promote the upgrading of the quality control system of the PV industry, but also provide important support for the global energy transformation and the realization of "dual carbon" goals, boasting broad market prospects.
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