Thanks guys I appreciate the advice.
I am a bit concerned with the shore power to inverter. Considering the 25ft cord to the pedestal, plus from the plug to the transfer switch behind the AC distribution panel, and then the 25 foot run to the Multiplus. This might need 8 AWG.
Now my next issue is the fact that I cant find 8/2 or 10/2 NM-B wire at the Canadian distributors. They only seem to stock 8/3 and 10/3. I might go with single 8 AWG and run 6 wires (3 each way). I can easily buy it in red, black, green, and white.
I can order 10/2 and 8/2 from US but it is pricey and wont get here for 10 days. I am hoping to run the wire this weekend.