I agree with JRP and suggest simplifying it heaps..
Buy a small Aqua-Signal or similar AC power panel (the smallest you can get) and connect one outlet and maybe the battery charger to it - nothing else. At least that way if you ever find yourself at a dock with shore-power you have some use for it.
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"