I'm thinking I may redo the electrical system from scratch. Here's what I'm thinking so far, roughly:
30A inlet
...#10 cable to...
30A main breaker
...#10 cable to...
Prosine 2.0 inverter charger
...#10 cable to...
load panel
20A GFCI breaker
...#12 cable to...
air conditioner
15A GFCI breaker
...#14 cable to...
bathroom outlet
15A GFCI breaker
...#14 cable to...
kitchen-counter outlets, outside outlet
15A GFCI breaker
...#14 cable to...
outlet behind fridge & all other outlets
Does that sound right? This is leaving aside all the
12V wiring for now.
I would never run the air conditioner on inverter power, but for the Prosine's power-sharing to work correctly, it seems like it has to be on the load panel tied to the inverter. Otherwise (as far as I can tell) you'd need to set the Prosine to think you only have 20A shore power, instead of the 30A you really have when the A/C is not running. And in fact, if you happen to be drawing 20A (battery charger taking 10A, microwave another 10A, eg) and the A/C starts up and pulls 15A, you could trip the shore breaker anyway, it seems to me.
The external power ground and the battery negative terminal should both be connected to the shell, correct? Do I need to connect that ground to the frame as well?
One more question - the neutral & ground should not be tied at the main breaker in the trailer wiring, as they'll be tied wherever the shore power is being provided, correct?
Prior to buying & installing the Prosine & batteries I can just connect from the main breaker to the load panel with #10 cable, and put the current
12V charger on a circuit on the load panel. (I don't want to get into a discussion of the merits or otherwise of an inverter just as yet; I just want to do all the wiring so installing one won't be difficult later).
I'm thinking I'll probably get a generator too anyway, but carry it in the truck bed and just plug it into the shore power connector when stopped.