I installed the new shore power system yesterday. Got the inlet plug cut out (installed it in the starboard wall of the footwell), the panel wired, galvanic isolator for the ground, and the new battery charger wired.

Plugged in the power and it all works!

I also have been able to test the Espar without the outflow duct attached - works just fine, no overheating issues. Looks like my problem is the pair of 90 degree bends, which should be an easy fix.