Product Testing
Edit Content
TF Series Solar Panel Reliability Test
Hot-spot endurance test
Test Requirements
a) No evidence of major visual defects permitted, as defined in IEC 61215-1, particularly looking for signs of melted solder, openings in the enclosure, delaminations and burn spots. If there is evidence of serious damage that does not qualify as a major visual defect, repeat the test on two additional cells within the same module. If there is no visual damage around either of these two cells the module type passes the hot-spot test.
b) Verify that the module shows the electrical characteristics of a functional photovoltaic device. MQT 02 is not a pass/fail requirement (Gate) for power loss.
c) Insulation resistance shall meet the same requirements as for the initial measurements.
d) Wet leakage current shall meet the same requirements as for the initial measurements.
e) Any damage resulting from determining the worst case shading shall be noted in the test report.
Test procedure:
- Under the test conditions of the insulation test: maximum system voltage of 1000 V, preset voltage of 3000 V and test voltage of 1000 V. The samples had no abnormal withstand voltage conditions.
- No abnormalities in the samples during the tests for visual inspection and maximum power determination.
- Under the test conditions of the wet leakage current test: maximum system voltage of 1000 V, test voltage of 1000 V, solution resistivity of 773Ω·cm and solution temperature of 21.1 ℃. The sample had no abnormal withstand voltage conditions.
Test Results：
The product did not show any abnormal pressure resistance in the above tests. The product passed the hot-spot endurance test.”
Thermal Cycling Test
Test Requirements
a) No interruption of current flow during the test; in the case of a module with parallel circuits, a discontinuity in current flow indicates an interruption of flow in one of the parallel circuit.
b) No evidence of major visual defects, as defined in IEC 61215-1.
c) Wet leakage current shall meet the same requirements as for the initial measurements.
Test Results:
The sample passed the thermal cycle test without any abnormalities and met the test requirements.”
Test procedure:
- Under test conditions in the thermal cycle test: maximum temperature of +85±2°C, minimum temperature of -40±2°C, total number of cycles is 200.
- The sample passes the test without abnormal pressure resistance during the test.
- The sample passes the visual inspection.
- Under the test conditions of the wet leakage current test: maximum system voltage of 1000 V, test voltage of 1000 V ,solution resistivity of 776Ω·cm and solution temperature of 23.9 ℃.
- The sample passed the test with no abnormal pressure resistance during the test.
PID test
Test Requirements
a) Module temperature: 60 ℃±2 ℃
b) Chamber relative humidity: 85% ±3% relative humidity.
c) Dwell: 96 h at the above stated temperature and relative humidity (not including stabilization). —Voltage: module rated system voltage and polarities applied for above given dwell duration and during ramp down of temperature to ambient conditions.
Suggested common temperatures to use for the detection of PID in modules that do not display degradation at 60 ℃ or when further acceleration is sought are 65 ℃and 85 ℃.