Offline String EL Tester OPT-S110H
The Ooitech OPT-S110H Offline String EL Tester is a high-performance electroluminescence (EL) inspection system engineered for precise defect detection of solar cell strings. Designed to serve solar panel manufacturers operating production lines from 5MW to 1GW, this offline EL tester provides fast, reliable, and non-destructive quality assessment of soldered cell strings before they proceed to the lamination stage.
By applying a forward bias current through the solar cell string and capturing the resulting infrared luminescence with advanced NIR industrial cameras, the OPT-S110H reveals internal and surface defects that are invisible to the naked eye. The system supports cell sizes ranging from 156mm to 230mm and string lengths up to 1250mm, making it fully compatible with mainstream wafer formats including G1, M6, M10, and M12 used in PERC, TOPCon, IBC, ABC, HPBC, and other advanced cell technologies.
With an offline test time of less than 2 seconds per string (excluding loading and unloading), the OPT-S110H ensures efficient quality sampling and batch inspection without interrupting the main production flow. Whether you are running an MBB tabber stringer line or conducting incoming quality checks on cell strings, this EL tester is an indispensable tool for maintaining the highest standards of module reliability.
Technical Specifications
Defect Detection Capabilities
The OPT-S110H is capable of detecting a comprehensive range of solar cell string defects, including but not limited to:
Hidden cracks (micro-cracks)
Broken gridlines
Faulty welding and cold solder joints
Bright and dark wafer mismatch
Bright spots
Surface scratches
Main Parameters
| Parameter | Specification |
|---|
| Model | OPT-S110H |
| Activation Rate | ≥99% |
| Applicable String Length | ≤1250mm |
| Compatible Cell Size | 156mm - 230mm |
| Offline Test Time | ≤2S (excluding loading and unloading) |
| Camera Resolution | 4.6 Megapixels (2.3MP x 2 dual cameras) |
| Camera Lens | NIR industrial-grade lens |
| Imaging Time | 1-60S adjustable |
| Shutter Type | Electronic shutter (non-mechanical) |
| DC Power Supply Model | PS6010 |
| Test Voltage Range | 0-60V |
| Test Current Range | 0-10A |
| Electrode Module | Manual electric pressing block placed on lead wire |
Computer and Display System
| Parameter | Specification |
|---|
| Display | 29-inch or larger, 1080p resolution |
| CPU | Intel Core i5-9400 |
| Hard Disk | 1TB |
| RAM | 8GB |
Software Abnormal Rate
| Parameter | Specification |
|---|
| Abnormal Rate (crash, camera connection failure, software connection failure, etc.) | Less than 1/200,000 times |
Technical Advantages
Advanced Dual-Camera Imaging System
The OPT-S110H employs a dual 2.3-megapixel NIR camera configuration delivering a combined resolution of 4.6 megapixels. The electronic shutter design eliminates mechanical vibration and wear, ensuring long-term imaging stability and consistency. With adjustable imaging time from 1 to 60 seconds, operators can fine-tune exposure for different cell types and string configurations to achieve optimal EL image clarity.
Intelligent Image Processing Software
The integrated testing software features automatic seamless image splicing through advanced software algorithms rather than hardware-based splicing, resulting in distortion-free, uniform EL images without background shading. Software filtering correction further enhances image quality, enabling operators to identify even the most subtle defects with confidence.
Comprehensive Parameter Control
Operators have full control over image optimization parameters including exposure time, gain, contrast, gamma correction, and brightness range (BR Max/Min). A tiered permission system for software parameter modification ensures that critical settings are protected from unauthorized changes while allowing authorized personnel to customize the system for specific production requirements.
Efficient Defect Classification and Data Management
The management software supports manual defect classification with automatic date-folder generation and organized image saving. EL images can be captured manually, and the image saving path is fully configurable. This systematic approach to data management simplifies traceability, enables statistical quality analysis, and supports continuous improvement of the soldering process.
High Reliability and Uptime
With an activation rate of 99% or higher and a software abnormal rate of less than 1 in 200,000 operations, the OPT-S110H delivers exceptional reliability in demanding production environments. The robust PS6010 DC power supply provides stable voltage output from 0 to 60V and current from 0 to 10A, accommodating a wide range of string configurations and cell technologies.
Ultra-Fast Testing Speed
The offline test cycle of less than 2 seconds per string ensures rapid throughput during quality inspection. This speed allows manufacturers to test a statistically significant number of strings per shift without creating bottlenecks, supporting both routine sampling and intensive quality audits.
User-Friendly Multi-Interface Design
The software provides a well-organized multi-interface layout including a main operation control interface for daily use, a manual operation interface for detailed inspection tasks, and a dedicated parameter interface for system configuration. The large 29-inch 1080p display offers clear, detailed visualization of EL images for accurate defect identification.
Product Applications
Solar Panel Production Line Quality Control
The OPT-S110H is primarily used as an offline quality inspection station within solar panel production lines. After cell strings are produced by the tabber stringer machine, sample strings can be taken offline and tested on the OPT-S110H to verify soldering quality, detect micro-cracks introduced during the stringing process, and ensure that defective strings do not proceed to layup and lamination. This is critical for maintaining module reliability and minimizing warranty claims.
Incoming Material Inspection
Solar module manufacturers who purchase pre-soldered cell strings from external suppliers can use the OPT-S110H to perform incoming quality inspection. By testing sample strings upon arrival, manufacturers can verify supplier quality, identify shipment-level issues early, and prevent defective materials from entering the production process.
Process Optimization and Troubleshooting
Production engineers use the OPT-S110H to diagnose and troubleshoot soldering defects. By comparing EL images before and after process parameter adjustments on the tabber stringer, engineers can quickly identify the root cause of recurring defects such as cold solder joints, cracked cells, or misaligned ribbons, and implement corrective actions.
Research and Development
R&D teams developing new cell interconnection technologies, evaluating new ribbon materials, or qualifying new cell formats rely on the OPT-S110H for detailed EL characterization. The adjustable imaging parameters and high-resolution dual-camera system make it an excellent tool for capturing publication-quality EL images during development work.
Compatible Cell and Module Technologies
The OPT-S110H supports a broad range of solar cell technologies and formats commonly used in modern solar panel manufacturing:
Cell formats: G1, M6, M10, M12 (156mm to 230mm)
Cell technologies: PERC, TOPCon, IBC, ABC, HPBC
Interconnection types: MBB (Multi-Busbar), standard busbar configurations
Module types: Standard rigid modules, shingled modules, and other string-based architectures
Contact Us to Order
The Ooitech OPT-S110H Offline String EL Tester is an essential quality assurance instrument for any solar panel manufacturing facility committed to producing high-reliability modules. Whether you are setting up a new production line or upgrading your existing quality inspection capabilities, the OPT-S110H delivers the speed, accuracy, and reliability you need.
Ooitech provides complete solar panel production line solutions ranging from 5MW to 1GW, including laser cutting machines, tabber stringers, layup machines, bussing machines, EL testers, laminators, framing machines, IV testers, sun simulators, and all related equipment and raw materials. We also offer comprehensive production process training and after-sales support.
To learn more about the OPT-S110H or to request a quotation, please contact us through any of the following channels:
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