Solar wiring route?

Looks to me like it would be prone to damage from tree branches etc. I may well be wrong there.

yeah, I wondered about that. Very easy to snag on something and rip off. Eternabond tape would solve that, but I'm not keen on how that would look on the outside edge...

go through the fridge vent

Faced with a similar situation, it was a long round-about to reach the fridge stack, I chose to snake it inside an interior wall. But it all depends on your floor plan.

Personally I would exhaust all other ideas before I ran wires down the outside. If I had to use the route you're thinking of, I would probably prefer to lay the wires along the outside of the awning channel, and cover them with Eternabond tape.

In the photo above, there is a channel guard inside the awning arm that covers the wire to the power awning head. So, the only exposure is the 6" or so from top of awning bracket to roof. The wires "could" go under that guard and be completely protected, except for that top 6".

Another vote for using the fridge chimney

I drilled a hole in my roof and ran the wires down inside the bedroom closet to the basement. I did this seven years ago and I have zero leaks. I sealed it with Dicor.

I did what Kent did. Shortest route, zero leaks.

I ran mine down the black tank vent and broke it out in the basement through a sealed fitting.

Whatever route you choose, it is much nicer to deal with a single sheathed cable, instead of a pair of loose wires.

I used this stuff.
10AWG Multi-Cond Cable