With a special test of electro-luminescence (a type of x-ray) carries out detection and visibility from the defects in the material and in the manufacture of photovoltaic cells. As a result, Imelec ensures 100% quality of the cells that make up the modules installed. With this test, it is also possible to detect any other defects caused by the later handling of the photovoltaic panels.
This test allows the detection and visibility of material defects in the manufacture of photovoltaic cells. As a result, it is possible to evaluate the quality of the manufacturing process of the cells and any other defect that may be caused by the subsequent handling of the photovoltaic panels. This method may locate the points where the series resistance is abnormally high, cracks in cells and areas where there is no electrical connection. These issues directly impact the longevity of the module and hence their profitability because if not, the module itself runs the risk of having to be replaced before amortization.
In particular, the microcracks have a significant effect on long-term stability of performance parameters of photovoltaic panels. The test can detect hidden defects unobtainable by other test methods (flash test, features V-A, or thermal camera).
During the analysis performed following measurements:
Voc (V) = Open circuit voltage.
Isc (I) = Short circuit current.
Vmpp (V)= Voltage at maximum power.
Impp = Current at maximum power.
Pmpp (W) = Maximum power.
FFm (%) = Form Factor.
n (%) = Performance.
RsH (Ω) = Parallel resistance.
Rs (Ω) = Series resistance.
Data records are measured in real time. The data is transferred to a computer, where the values are processed using the software.
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