The "Nb. of strings (transverse)" refers to the number of modules you have stacked in one table. But, if you are using MLPE such as microinverters or power optimizers, you need to specify the number of sub-modules, not modules. So for example, if you have a table that is 4 modules high, in landscape, then you will usually specify "4" in the Nb of strings. But, for the same system using SolarEdge power optimizers, for instance, you will specify "12" (because there are 3 sub-strings per module).
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