I never considered adding more heat to the living spaces by venting it into the passageway/alley.
 
Perhaps my thinking is influenced by the high heat and high humidity I'm dealing with right now, but that passage berth, which is perfect for the off-watch crew member, gets warm enough as is. I'd be loathe to do anything that makes it even hotter.

But you're right, the charger/inverter is mounted sideways in the engine compartment. We directed outside air right near the charger/inverter intake, similar to the old Dolphin setup. The Dolphin lasted 12 years, so I presume the "salt air" won't cause damage. And we don't see output tapering even after running it near capacity for longer periods. We followed the Victron recs for line size and used some online calculators to verify, so I'm not too concerned about voltage drop. 

That said, neither solution is ideal, imo. Boats are always compromises, I guess!
--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com