Interpreting Measured I-V Curves
7-121
Electrical Interconnections in the Array Are Resistive
Electrical connections anywhere along the current path can add resistance to the circuit. Assure that
connectors between modules are fully inserted. Also check for signs of corrosion in J-boxes and
combiners.
Series Resistance of PV Modules Has Increased
Certain degradation mechanisms can increase the amount of series resistance of a particular module.
Corrosion of metal terminals in the module connectors, in the module junction box, or on the
interconnects between cells may increase series resistance.
Troubleshooting PV Arrays
The following chart shows a method of troubleshooting PV arrays. For a detailed article on
interpreting I-V curve deviations, see SolarPro article, "Solar I-V Curves--Interpreting Trace
Deviations"
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