A couple questions about what I'm seeing on the web app.

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    Curtis Community Moderator

    Hello H P

    Thank you for your contribution to the Tigo Community. 

    A string will only produce as much as it can with regard to direct irradiation. Tigo Optimizers provide more current during shading conditions, but if the string is being hard-shaded (i.e., from a solid object or wall), the result will be lower output from the module. This can also depend upon the orientation of the module and how the shade falls across it.

    For more information on how shade can affect diodes, please read our article on:
    Which orientation is best for PV Modules? (vertical or horizontal)

    If you feel that there is something else at play here, please feel free to reach out to our Support Team. Our highly trained Engineers can review your system design and provide more information on why you may be experiencing less production on that string. 

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    H P

    Thanks.

    Here's a photo with D3 on the far left and E3 on the far right.   As you can see, E1 and D6 are under pretty much identical irradiation patterns but as you can see in the data, they produce very different amounts.

     

     

    In the below screenshot, MPPT3 is the E1-3 panels, and MPPT2 is D1-6.  

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    H P

    I think the way this is going to get solved is if I can understand what the panels themselves are generating before the TS4-A-O's.  ie: what the TS4's are seeing before they do their DC<->DC thing.  I think that'll tell me whether I have some sort of high-resistance connector crimping issue or something.

    Having 3 panels at 125v but generating 250mA when a neighboring panel is generating 10A is suspicious of something, but I don't know what.

     

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