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Aireal

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  1. Like
    Aireal got a reaction from Marcodp in Correct Wiring of a Solar Combiner Box   
    Interesting question, I see the following as the safest:

    PV -> Fuses -> Isolator -> Inverter

    The SPD is in parallel so it doesn't fit into the chain here, but should hang off before the isolator. Otherwise if you turn off the isolator you then remove over voltage protection.
    The fuses should also be on the PV side of the isolator for the same reason, otherwise you remove over current protection if you isolate the panels.
     
     
  2. Like
    Aireal got a reaction from hoohloc in The necessity of DC fuses in a PV system   
    PV modules are a current source, but they can realistically only produce up to their rated current. Your wire gauge should be designed to carry more than that amount of current. Besides an installation error I don't see a situation where, on a commissioned system, a fuse should ever blow. Even if your PV positive and negative were shorted together, it would still not draw more than the arrays rated current.
    What am I missing here? Are fuses actually necessary or are we just putting in extra protection for the sake of it?

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