1. Detect the solar panel voltage under light conditions, and at the same time detect the voltage under shadow conditions. Under normal circumstances, it should be higher than the voltage measured under light conditions, and it should change with light. Lighting conditions. As the intensity or illuminated area changes, the voltage changes.
2. Connect a load under bright conditions and observe whether the load can operate normally, such as a low-power DC bulb, or measure the wire current.
3. Check if the appearance of the component board is intact.
4. If you are really worried, you can send it to a specialist agency for testing.
That's basically it, personal opinion, for reference only!
Solar panel testing method
Test conditions: AM1.5, 1000W/㎡, 25℃ Output power error: ±5%
Standard conditionstest: AM1.5, 1000W/m2, 25℃ Explanation
AM1.5, 1000W/m2, 25℃ is IEC61646 - Design and finalization of ground-mounted thin-film photovoltaic modules (GB/T18911- 2002) testing standards. It is also the general testing standard for GB/T11011-1989 - General provisions for electrical performance testing of amorphous silicon solar cells.
AM means air mass (air mass). The definition is: path length through the atmosphere relative to the vertical thickness of the atmosphere, which is the actual distance of light passing through the atmosphere from the vertical. thickness of the atmosphere. AM1.5 means that the actual distance light travels through the atmosphere is 1.5 times the vertical thickness of the atmosphere.
1000 W/m2 is the standard light irradiance of solar cells.
25ºC means working at a temperature of 25ºC. The efficiency of solar cells will decrease asas the temperature increases when they are used, and the output voltage, current and power when working can be obtained from the temperature coefficient.
How to test the quality of solar panels
(1) Since the output power of solar modules depends on factors such as solar irradiation and the temperature of the solar cells, The measurement of the solar cell modules is carried out under standard conditions (STC), which are defined as:
Air quality AM1.5, light intensity 1000W/m2 , temperature 25℃.
(2) Open circuit voltage: use 500W tungsten halogen lamp, 0-250V AC transformer, adjust the light intensity to 38,000-40,000 LUX and the distance between the lamp and the test platform is about 15-20CM. The direct test value is the open circuit voltage;
(3) Under this condition, the maximum poweroutput of the solar cell module is called peak power.The peak power of a module is usually measured using a solar simulator. The main factors that affect the output performance of solar cell modules are:
1) Load impedance
2) Sunlight intensity
3) Temperature
4) Shade
The quality of solar panels is mainly judged from the following aspects:
1 Look at the surface and examine it carefully. surface area of tempered glass Generally small In order to increase the production speed to a certain extent, manufacturers often inadvertently pour silicone onto the tempered glass, which may not be noticeable initially. But if it is not clear, it will affect the normal working efficiency of the battery panel.
2. Watch the battery sheets when splicing them, use broken sheets. This methodwill cause the dragon chair to become disconnected during use, affecting overall efficiency.
3. Look at the back to see if there are any bubbles or other phenomena on the back.
4. Check whether the silicone on all four sides of the silicone is uniform and whether it penetrates.
5. Check whether the frame appears to be made evenly and tightly and whether the degree of tightness is uneven.
6. Check the solder for leaks. Check if the drum sheets are even.
7. Check if the junction box is waterproof and can rotate freely.