Generally speaking, every module, string, and whole array,
whether in normal or fault condition, has its own I-V characteristics
and unique maximum power point (MPP). When PV modules
are connected together, their performance is determined by the
interactions among them. For this reason, PV modules perform
together like a chain that is only as strong as the weakest link.
In our case, the weakest link is the faulted String 1.