Amprobe SOLAR-500 Solar-Analyzer - Manual (Page 11)

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Abnormal I-V Curve (defected cells scattered over the solar panel)
The technicians or maintenance engineers can store the characteristics data
of solar panels in the beginning. And compare the characteristics data in the
weekly, monthly or yearly maintenance. If the characteristics of any solar
panels are different from the previous data, technicians or maintenance
engineers can further identify the problems of solar panels.
For example, if any cells of solar panels are damaged, the I-V curve would
be very different from a typical curve. If the solar panels are covers by a lot
of dust, the I-V curve or the maximum power would be much lower than
previously stored data. Once defected panels are found, technicians or
maintenance engineers can replace them with new panels
Example C: Verify the Best Installation Angle of Solar Panels
Engineers can collect data of installation angle at different date and time
by using the unit at site of installation. The data can be used as reference to
design automated angle adjustment system. Or the data can be used to select
an optimal angle for a fixed angle installation.