Solar Module EL Tester is primarily used to identify defects in solar panels or photovoltaic modules. These defects are typically caused by material issues, manufacturing flaws, or damage from long-term use. EL detection technology helps identify tiny defects that are invisible to the naked eye and provides crucial data for product quality control and performance assessment. The working principle is as follows:
Electroluminescence Principle: When voltage is applied, the semiconductor material in the photovoltaic module emits light. The light emitted from defect areas differs from that of normal areas, allowing them to be detected.
Image Capture: High-sensitivity cameras (typically near-infrared cameras) capture the light emitted from the surface of the photovoltaic module.
Image Processing and Defect Identification: Image processing software analyzes the captured images, identifying defects such as cracks, hotspots, and soldering issues, and marks them accordingly.
Result Output: A defect report is generated, showing the location, type, and severity of the defects, helping manufacturers optimize quality control.
About YH-EL4:
Profile
YH-EL4 PV module EL automatic tester applies an external constant current stabilized power supply to the battery module, uses electroluminescence technology to perform special imaging on the semi-finished and finished photovoltaic cell modules before lamination, after lamination, and after packaging, and displays clear imaging results on a computer display. Using customized software from YOHA images can clearly display various defects in battery components that cannot be observed by human eyes.
Detect defect types
1. Defects in battery materials (fragments, hidden cracks, broken grids, contamination)
2. Welding process defects (virtual welding, desoldering)
3. Mixing of different levels
Technical Data:
| Product model | YH-EL4 |
| Panel Size |
Length :1650-2600mm Width:950-1500mm 156-210 cell Panel |
| Shooting mode | Facing downwards; Multi camera shooting |
| transmission method | Long Side In |
| Detection time | <23s, speed adjustable |
| Camera |
Customized Industrial Camera with Sony Chip Or 2*SLR Cameras |
| Camera type | Customized Industrial Camera |
| Camera resolution | Multi-camera 4m *12 |
| Image acquisition time | 1~60s adjustable |
| Load current/voltage | 20A/60V |
| Drive current/voltage | 20A/60V |
| control mode | PLC Siemens Touch screen:WEINVIEW |
| Power method | Probe automatic contact |
| Operation mode | Fully automatic (feeding and unloading, correction and positioning, power on detection, image processing) |
Equipment workflow:
1. The solar panel placed face down with the long side facing forward into the docking station. The blocking device raised to put the modules in entry waiting status. At the same time, barcode scanning is automatically performed, and after scanning the barcode, take photo automatically
3. The system takes photos and the software automatically splices the images to display the results
4. Upon completion of the display, an OK or NG signal is sent to the next level. The transmission is automatically initiated after receiving the discharge permission signal from the next level.
Equipment Structure:
1. This equipment mainly consists of the following units: automatic feeding and discharging mechanism, photography system organization, automatic power on mechanism, specialized software and printing system.
2. Subsystem Description
2.1 Automatic feeding and discharging mechanism
Cabinet design, can seamlessly connect with the automatic transmission line of components (height 900-1080mm), with the glass side facing downwards and the long side facing forward for horizontal entry and exit.
This device is automatic for feeding and discharging, including front and rear connecting stations (transfer waiting).
The transmission system of the front and rear material transfer platforms adopts a roller transmission method, and the internal transmission system of the equipment adopts a belt or guide rail transmission method.
2.2. Photography System Organization
The fully automatic EL defect detector is equivalent to a simple darkroom, avoiding direct sunlight on the camera lens. The equipment uses multiple industrial cameras for shooting and splicing, and 72 packaging components are photographed without rounded corners or deformation.
2.3 Automatic power on mechanism
Before feeding, when the feeding dock is waiting for the position, a specially made fixture is installed. The electrode wire connector is manually inserted into the fixture and installed on the junction box (or other relatively fixed positions). After entering the testing position, automatic measurement is completed by using a lifting probe contact method.