Where to bring solar panel wires down from Roof?

[Fishin2dMax]

I'm planning to install two, 100 watt solar panels on my HC 305 RL and trying to decide the best (easiest) place to bring the solar panel wires down through roof? I'm thinking about coming down the bedroom bath sink vent pipe and then come out of pipe above sink wall connection (under the vanity) and then down into basement and to controller / battery. The challenge is locating a place in the ceiling that doesn't have a duct, wall cap or truss member in the way. Any concerns with using the sink vent pipe (if it properly sealed)?

[PNW Fireguy]

Many folks, including myself, have used the gray tank vent on the roof. I drilled and tapped two holes behind the basement wall to insert sealing electrical connectors to exit the wires from the vent pipe while keeping the pipes integrity in tact. This also provided a straight shot to my charge controller location thereby minimizing the length of wire which is what you want to do.