If your elect. service/converter box is like mine, there are at least three knockouts on the back on the 120VAC side for box connectors and Romex or SJ or whatever you're running. Not easy to get at from the sink access door in my Burro
so I pulled the entire converter box out of its "hole" to put in a line for microwave
. Also have to remove front inside cover plate over the breakers to get access to terminals and buss bar. If you've got 120 receptacles, I'd think you'd simply plug in. DC stuff powered by converter gosinta the DC fuse blocks. I also think you HAVE a converter to power DC from 120 shore power and probably don't NEED or can't provide enuf DC for inverter-served AC.