Final PV module degradation-analysis report Page: 30 of 70
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Electrical
No significant changes were found on the forward and reverse dark curve
measurements. During the high-voltage breakdown tests at 1000 V, the leakage
currents, which had decreased to one-half of their original values after five
months, had increased slightly from these values.
3.2.3 Final Analysis: 48 Months Exposure
Visual
The AR coating on the majority of the cells on both modules had faded to
or changed to a rusty hue. The dark stains on the cells, noted at receiving
inspection, have also changed to'a rust color. This condition is believed to
be the result of the continuing migration of the tin from the solder on the
grid linco into the AR coating.
The use of tools on the interconnects during fabrication has removed
segments of the plating, exposing the copper beneath. These exposed areas
tend to tarnish with exposure time. These tarnished areas were found on the
majority of the interconnects on both modules. The mounting hardware and
grounding screws on the rear side ofboth modules were badly rusted.
Electrical
A high-voltage breakdown test was performed at 1000 VDC on both modules.
The leakage currents were noted to have increased 0.15 and 0.1 Pa,
respectively, after an additional 37 months in the field. A comparison of
the receiving inspection, first, second, and final analysis leakage current
results can be found in Table 3.
Forward and reverse dark curves measurements were taken on both modules.
On the forward dark curve, a decrease of 0.5 V was found on the first module
and an increase of 0.2 V was found on the other module. On the reverse dark
curve, the first module showed a decrease of 2.0 milliamperes (ma), and the
other module showed a decrease of 1.0 ma since the previous analysis. A
comparison of the forward and reverse dark curve measurements can be found in
Table 3.18
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Themelis, M P. Final PV module degradation-analysis report, report, June 1, 1982; United States. (https://digital.library.unt.edu/ark:/67531/metadc1054835/m1/30/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.