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Thanks for the helpful and quick reply. The Renogy kit came with 3-way Y branch connectors, I was going to swap them out with these Solar Y Branch Connectors. That would be 4P, correct? These are the panels, Renogy RNG-100D-SS. I have three currently and have a 4th one coming. Would this be...

What about the wire size? I put in a 300-watt system with #10 wire, which I believe is rated for 30 amps. I want to add one more 100-watt panel. Do I need to go up a wire size, say to 8 AWG? I already have a 30-amp Renology inline fuse, that should protect the wire if it gets above 30-amps...