Case 1
As a solar energy new energy photovoltaic company and solar cell power generation installation engineering company in Shandong, how to judge the quality of solar modules has always been the most troublesome problem for our company. Party A requires every piece of 250W PV module or 200W and 150W module before installation, 2 The meter assembly must be tested for internal crack internal defects and internal short circuit cracks, black heart, low efficiency sheet, sintered mesh, material defects and debris problems.
Case 2
A year ago, the solar cell power plant of the component was running down the power and it was still unable to meet the requirements. How to judge the quality of the solar module was good and bad, and the acceptance required the third party to check the qualified sampling, but the peak value of the power generation was very low. Each group of components needed to be inspected. All have to test whether there is an internal crack problem.
Solar Module Portable EL Detector (EL Tester)
In 2016, the photovoltaic power station broke out, and photovoltaic power stations were being built in all locations. Before the policy adjustment, installations were installed. However, with the increase in the number of photovoltaic power stations, the quality problems that ensued once again bothered everyone due to the technology and its The problem lies in the quality of the manufacturer's components, whether the transport components are damaged, and whether the installation and construction are faulty. The reason for this is the lack of a set of standardized testing procedures. The analysis of common defects in the EL test is also advancing with the times. The component tests all the processes, as well as the description of the EL detection testing methods for PV power plant components. Outdoor portable PV module EL tester Testing technology developed around the conversion efficiency of photovoltaic devices, photovoltaic performance assessment technology, internal defect detection technology is the use of photovoltaic components EL reverse point plus light emitting heating principle developed by Dulwich Solar Module internal detection Cracking, black heart, low-efficiency sheet, sintered mesh, material defects and debris, through the PV module before installation to ensure the photovoltaic module installed after the installation of the power generation efficiency, the device is easy to operate, easy to carry detection especially suitable for outdoor testing and liquidity user site Testing.
How to Determine the Quality of Solar Modules by Traditional Inspection Methods
1, look at the surface
When you look closely at the surface of a tempered glass, generally small manufacturers do not carelessly drop the silicone on the surface of the tempered glass in order to increase the production speed. Not clearing will reduce the power generation efficiency of the panel.
2, see the battery slice
Many non-regular manufacturers use broken cell splicing to form a seemingly complete battery for welding. This method is very risky and may not be obvious at the beginning, but the spliced ​​battery can easily be disconnected later, affecting the entire block. The use of panels.
3, see the back
Look at the back of the pressure of the pressure, after the pressure there is no uneven appearance, such as bubbles, folds and the like.
4, see the border
As the solar panel industry entry threshold is low, many small manufacturers use artificial boxing, manual boxing due to the uneven strength of each box, the box is not close to a close degree of contact, the shape can not be a strict rectangle, firm The degree is also greatly reduced.
5, see silicone
See if the silicone on the back side is evenly distributed and whether it closely penetrates the gap between the backplane and the frame.
6, see the welding
Observe the string welding of the battery piece to see if there is any solder leakage. At the same time, we must also see if the cell array is regular.
7, see the junction box
Finally, see if the junction box is firm and the junction box cover can be firmly and tightly attached to the junction box; see if the wire cable lock head rotates freely and tighten.
The above 7 points are all rough inspection methods. As technology advances, Party A’s requirements increase and power plant owners’ awareness raises the demand for power generation. More advanced identification methods and equipment are needed. Such as third-party photovoltaic power plant test institutions Dulwich's EL Component Tester can find every internal problem of the battery (internal crack internal defects and internal short circuit cracks, black heart, low efficiency, sintered mesh, material defects and debris problems).
D&W Photovoltaic Module Portable EL Detector Product Description:
The use of PV module EL light-emitting principle developed detectable solar module internal cracking, to ensure the photovoltaic module power generation efficiency through testing, the device is simple in construction, easy to operate, portable, suitable for liquidity users on-site testing, exclusive wireless viewing remote control The United States imports core chips and is equipped with a multi-platform APP for remote control. For the detection of solar power plant components and incoming solar panels dedicated mobile testing equipment.
Particularly suitable for photovoltaic power plants now installed before testing, and solar panel dealers to use the incoming and outgoing inspection! Proactively understand the problem of incoming panel and discover hidden loss to avoid losses.
Photovoltaic module performance testing
After the photovoltaic power station is running for a period of time, it needs to be tested to determine the performance of the photovoltaic power station. Involving photovoltaic modules mainly includes the following items.
1, power attenuation test
What is the decay rate of PV modules after 1 and 25 years of operation? For 25 years too long, there may not be a power station that has been operating for such a long time. According to national standards, the decay rate of crystalline silicon cells for 2 years should be within 3.2%. However, this data is really hard to say for three reasons:
1) The output power of PV modules is calibrated with laboratory standard light sources and testing environment, but it seems that there are certain differences between the standard light sources of different manufacturers in China. The 250W component that was calibrated at the A plant went to the B plant, which may be the 245W component.
2) The accuracy of the instruments used in field tests is poor, and it is said that errors within 5% are acceptable. Using an instrument with an error of 5%, the attenuation of 2% (1 year) is measured, and the difficulty is somewhat large, and the result is doubtful.
3) The difference between the test conditions at the site and the laboratory is quite large, and the time at 1000W/m2 and 25°C is too small! Therefore, it is necessary to perform a conversion from the test value to the standard value, and the output power and irradiance are only positively correlated in a very small interval. As shown in Fig. 2, even at 800 W/m2, it is not positively correlated. Therefore, there must be errors in the conversion.
In addition, many components may appear to be -3% power deviation, not decay, 3% will be lost directly ... ...
2, EL test
When there is a problem with the photovoltaic module, the local resistance increases and the temperature in the area rises. The EL tester is just like the X-ray machine in our physical examination. It can perform physical examination on the PV modules. - Through infrared imaging of Dulwich's portable component detectors, the images show different colors according to different temperatures, making it very easy to find photovoltaics. Many problems with components: cracking, hot spots, PID effects, etc.
Latest version Features Features Features
1 Fully automatic focus function: Laser technology is used to make the imaging system auto focus.
2 Ranging function: Using Bluetooth wireless technology to easily observe the test distance.
3 Wireless data transmission: Using wifi technology to achieve remote wireless control of the tablet/phone to take photos and images.
4 Mobile Power: The self-developed mobile power supply makes it easy to power on the site.
5 Fully-automatic PTZ system, suitable for testing large ground power stations, can inspect large area components at the same time.
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