What are the standards involved in the electrical performance test (IV curve) of photovoltaic modules?
One of the most common standards is IEC62446 for on-site testing of power stations, and the introduction of IV curves is relatively large
What are the basic performance indicators and detection methods of solar cell modules
Basic performance indicators:
1. Product testing:
1) Thermal cycle: The component temperature is 90℃ ~ -40℃ for 200 cycles.
2) Humidity - freezing: The component is tested for 10 cycles.
3) Hail impact: The ice ball is released from the ice ball transmitter to the middle of the formation glass front and the connection.
4) Insulation withstand voltage
(1) When the component area is greater than 0.1㎡, the component electrical performance test, under normal conditions, the insulation resistance shall not be less than 40 MΩ component electrical performance test; When the component area is less than 0.1㎡, the insulation resistance shall not be less than 400 MΩ under normal conditions.
(2) The voltage gradually rises to the test voltage at a stable and uniform rate within 5s, and the voltage is maintained until the leakage current is stable for at least 1 min.
5) Salt
In brine solutions, common salt accounts for 5% of the mass of the distilled water. The pH value is between 6.5 and 7.2, and the density is 1.026 to 1.040 at 35 °C. Keep the indoor temperature within the range of 33 °C ~ 36 °C. Soak for 3 days.
6) Wind load
The assembly is mounted on the frame and subjected to 2400Pa equivalent to 200 km/h wind, alternating back and forth 10,000 cycles. It is to simulate severe wind conditions and check for loose contact and possible battery damage.
7) Twist
The assembly is fixed at three corners and the fourth corner is raised by about 1 ", then wind conditions and torque are simulated to check for battery damage and loss of electrical contact.
8) Long heat treatment
(1) The components are kept at 90% relative humidity and 90 ° C for 5 days to further ensure that moisture intrusion is prevented.
(2) Vibration test: acceleration 2g, XYZ three directions, each 2h.
2. Environmental testing
1) Temperature changes
(1) Repeated alternating changes from high temperature to low temperature are called temperature alternation.
(2) Temperature range: -40±3 ~ +35±2℃.
(3) Tempered glass cover plate assembly alternates 200 times, and high-quality glass cover plate assembly alternates 50 times.
2) High temperature storage
The solar cell module for ground use should be stored at a high temperature environment of 85±2℃ for 16h.
3) Low temperature storage
The solar cell module for ground use should be stored at a low temperature environment of -40±3℃ for 16h.
4) Constant moist heat storage
(1) The solar cell components for the ground should be placed in a humid and hot environment of 90% to 95% and the temperature is +40±2℃ for 4 days.
(2) At the end of the experiment, in addition to the electrical performance test and appearance inspection, the insulation resistance should also be checked.
5) Vibration, shock: the purpose is to assess its ability to withstand transportation.
Vibration frequency: 10 ~ 55Hz
Amplitude: 0.355mm
Vibration time: normal 20min. Tangential 20min
Impact waveform: half sine, trapezoid, post-peak sawtooth, lasting 11ms
Peak acceleration of impact: 150m/s2
Impact times: normal and tangential 3 times each.
6) Ground solar irradiation test
(1) The test was carried out in a simulated ground solar irradiation test chamber.
(2) The simulated sunlight should irradiate the component vertically, the illuminance is 1.12±10%kW, and has the spectral distribution of the ground sunlight.
7) Bending test
In the room temperature environment of 15 ~ 35℃, the three corners of the solar cell module are fixed, and the other corner is installed on the bending tester, so that one short side of the component is twisted by 1.2°, and the appearance and electrical performance are checked after the test.
