As I am awaiting the delivery of our solar panels for our Georgetown I have researched this a bit. Usually the wires from the panels are either run down a vent pipe for the plumbing that is in a convenient location to where you need the wires to be. A hole big enough for the wires to come out is drilled in the side of the pipe, the wires are fished out and the hole is sealed up around the wires with good silicone sealant. Remember that it's just a vent and you should never see any water in this pipe. The other thing I have seen is to run the wires down the refrigerator vent if you have one with a vent on the roof.
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