Guide to best practice
Mismatches in panel characteristics is a common phenomenon in electrical systems. A mismatch is caused by the interconnection of parts which do not have identical properties or which
Mismatch in photovoltaic (PV) modules can significantly reduce the overall energy output and efficiency of a solar power system. It can also lead to hotspot formation and potential damage to the modules over time [1, 2].
The following chart displays an example of a mismatch in panel voltage. Low power mismatch together with the high-energy mismatch indicates that the module is partially shaded. Further analysis, using charts to compare the energy of the suspect module to several other modules, supports this assumption.
The solar cell size, mainly its length, has a large impact on the current mismatch and therefore on the power reduction when applying the same soiling scenario to different module designs with different cell sizes along the module's short edge.
Also, the different strings must be within 25% for minimum and maximum voltage, current, and power produced by a string of modules. Module Power Note: Module power mismatches between different modules are not restricted as long as the voltage and current differences are less than 25%.
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