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Thread: Grounding electrode & series string fuse

  1. #11
    Join Date
    Sep 2012
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    Thanks man. He kinda feels like one of those guys who likes to use his authority and knows just a little bit about the code to make him dangerous, lol. I'm going to touch base with Sunpower as you mentioned. Thanks again!

  2. #12
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    Sep 2012
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    CA, US
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    So want to make sure I am understanding 690.8 & .9 correctly.

    I have a Fronius Primo 15.0 inverter which I believe has 8 total inputs (4 on MPPT 1 and 4 on MPPT 2). There are 4 integrated fuse holders on MPPT 1 (for both positive and negative) and no integrated fuse holders on MPPT 2. I am planning on bringing 6 strings into the inverter.

    If I bring 4 strings into MPPT 1, which would all be fused, and 2 strings into MPPT 2, which would not have fuses, does this comply with NEC? Or would I need to install external fuses on the 2 strings going into MPPT 2?

  3. #13
    Join Date
    Oct 2009
    Location
    Austin, TX, USA
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    10,170
    Quote Originally Posted by electro7 View Post
    If I bring 4 strings into MPPT 1, which would all be fused, and 2 strings into MPPT 2, which would not have fuses, does this comply with NEC?
    Yes.
    Quote Originally Posted by electro7 View Post
    Or would I need to install external fuses on the 2 strings going into MPPT 2?
    No.

  4. #14
    Join Date
    Sep 2012
    Location
    CA, US
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    132
    Boom, thank you!

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