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The Devices That Will Definitely Impress you! - Our Latest Solar String EL Tester and Solar Module IV Tester

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The Devices That Will Definitely Impress you! - Our Latest Solar String EL Tester and Solar Module IV Tester

2025-03-14

With over 15 years of expertise in the photovoltaic industry, Yoha Solar is thrilled to announce the latest production and shipment of its state-of-the-art devices. Our newest offerings—the Solar String EL Tester and the Solar Module IV Tester—are meticulously engineered to boost testing accuracy and enhance production efficiency in the solar sector. Below, we detail their standout features, technical specifications, and shipment information, complemented by high-resolution images of each machine.


Solar String EL Tester
Our Solar String EL Tester is engineered to perform detailed electroluminescence inspections on solar strings. Key parameters include:


Items Functions
Defect Detection Types The equipment should be capable of detecting at least the following types of defects: hidden cracks, black spots, misalignment, broken grids, cold solder joints, light/dark spots, bright spots, scratches, etc.
Cell Types Monocrystalline/Polycrystalline silicon solar cell string
Efficiency ≥99%
Applicable String Specifications String length: 1350*300mm
Testing Cycle Testing time ≤2 seconds, excluding loading and unloading time
Camera 4 Cameras
Camera Resolution 5 million pixel high-definition industrial camera; NIR industrial-grade lens; imaging time adjustable from 0.3~2 seconds
Shutter Type Electronic shutter, non-mechanical shutter
Photographing Method Direct illumination
Power-On Method Manual power-on
Computer a) Display system: 29-inch or larger 1080p monitor
b) Dedicated industrial computer host
Management Software EL image automatic shooting function; barcode scanning, manual input
Defect classification, automatic generation of date folders, saving function
Software filtering correction, image uniformity without background pattern
Abnormal Rate (e.g., system crashes, camera connection issues, or software connection issues) Less than 1/200,000 occurrences
Testing Software Image software automatically stitches images seamlessly, no hardware stitching
Automatic image capture and saving
Image save path is configurable
Image optimization parameters adjustable (time, gain, contrast, Gamma, BR Max/Min)
Software parameter modification permission settings
Main operation control interface, manual operation interface, parameter interface, etc.
Detection Effect EL defects (hidden cracks, black spots, misalignment, broken grids, cold solder joints, light/dark spots, bright spots, scratches, etc.)
Images can be displayed for operator judgment
Electrode Module Dual-module dual-position voltage block (manually placed on the lead line for testing)
DC Power Supply Model ZL6010
Testing Ampere 0-60V
Testing Voltage 0-10A


Solar Module IV Tester
Our Solar Module IV Tester plays a vital role in ensuring the reliability and performance of solar modules before they hit the market. Its advanced testing capabilities include:

Model YHPT-AAA Feature
Lamp Spectrum In line with IEC60904-9:2007(A Grade)


  • Measurable parameters: I-V curve measurement, short circuit current, open circuit voltage, peak power, peak power point voltage, current, fixed voltage current, fill factor, conversion efficiency, sun simulator light intensity, and environmental temperature, ensuring comprehensive solar module testing.

  • Automatic classification and display function: The system can automatically classify solar modules based on fixed voltage and current parameters, with results directly displayed on the test cabinet through a digital display. This enhances usability and efficiency in the solar panel production line.

  • Four-wire connection for high accuracy: Solar IV Tester adopts a four-wire measurement method, minimizing resistance errors and ensuring precise current measurements.

  • Simultaneous temperature and light intensity measurement: By measuring both environmental temperature and A+A+A+ grade solar simulator light intensity in real-time, the system ensures highly accurate automatic correction for solar cell performance evaluation and make it an essential part of a solar panel production line.

  • Self-tuning and compensation system: Features a self-tuning mechanism with manual input for compensation parameters, along with automatic/manual temperature compensation and automatic light intensity compensation, optimizing test accuracy across different operating conditions.


Light Intensity 1000W/m²(700W/m²-1200W/m²)
Light intensity non-uniformity ≤±2%[AAA]
Instability degree of irradiation ≤±1%[AAA]
Test results consistency ≤±0.05%[AAA]
Test error of electrical properties ≤1% AAA
Single flash time 60ms 100ms 150ms(Optional)
Effective Test Range

2500mm×1400mm

2600*1500mm(Optional)

I-V Curve

Measuring Voltage

0-200V(Resolution 1mV)

I-V Curve

Measuring current

200mA-20A(Resolution 1mA)
Environmental temperature 15℃~30℃
Test Parameters Isc, Voc,Pmax, Vm,Im,FF,EFF,Temp,Rs,Rsh
power 220V/50Hz(60Hz)


All these devices have been manufactured and delivered to major markets worldwide. We proudly serve clients in India, Sri Lanka, the United States, and numerous countries across Africa, East Asia, and beyond. At Yoha Solar, we are dedicated to prompt delivery and exceptional customer support, ensuring every client benefits from both cutting-edge technology and reliable service.

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