Current reported for disconnected array? Do I have a short?


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    Harry Cline

    Assuming that A and B are still connected to each other even without connection to inverter, which apparently, they are - when the 2 strings voltages are not equal (due to shade or angle of the sun, etc.) there will be some reverse current from the higher voltage string back through the lower voltage string.

    In this system the voltages are nearly exactly the same much of the time, but not equal at other times. The reason the current in A varies over time is that during the times that the B string optimizers are optimizing, which is reducing voltage to the string and at the same time increasing the current to match other panels in the B string, the B units which are optimizing result in the total B string voltage being less than the total A string voltage.


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