We are scheduled to have two solar panels installed on the roof of our RW 31SL in a few days. I hate to make new holes in the roof and have read of people running the wires down the vent for the black holding tank although I do not know how or where the wires exit the vent. Can anyone provide advice on this or any other aspect of adding solar panels?

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I believe he's running it along side the vent, not in the pipe.
Sorry I'm not familiar with the plumbing on SL, but there are a few of them on here so you should get your answer soon.