I ran the cables down the inside of my grey water tank vent. Removed the cap, cut a notch in the pipe with a round file, cut a section of the pipe in the basement and cut the same notch. Run the cable down the pipe and out the notch in the basement. PVC cement a coupling into the sectioned out piece, silicone the notch. On the roof put the cable in to the notch and replace the cap and use roof sealant.
First two pics you can see the cables entering under the vent pipe. Third pic you can see the white coupling on the left vent pipe where the cables are exiting the vent pipe.
Hope this helps.
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3)
2019 Ram 3500 Limited w/ Max Tow pkg