When using 2 strings in a combiner, why would one string voltage measure about 1/2 when one string fuse is blown?

    When using 2 strings in a combiner, why would one string voltage measure about 1/2 when one string fuse is blown?

    Comments

    Dwayne, where was the voltage measurement taken?  It sounds like the faulted string on first brush, maybe the faulted module lies somewhere mid-string and that might be why you're seeing half.

     

    The voltage was measured in the SB4000-US inverter after the strings were combined in the combiner of the DC disconnect. A blown fuse was the problem. There were no faults in the module string. The string voltage was normal after the faulty fuse was replaced.  

    Submitted
    6 years 4 months ago
    Asked by
    Dwayne Cutshall
    Support topics
    BOS
    Support tags
    combiner box
    DC voltage