Re: Running Electrical Outlets
Your 1000-watt inverter will put about 8 amps. No point in getting fancy with circuit breakers if that's all you are using, just wire up outlets starting from a 15-amp (common) plug, and use the breaker in the inverter. If you are going to use a shoreline, unplug your feed from the inverter and plug it into the cord. You might want one 15-amp breaker at the beginning of your wiring instead of trusting the breaker on the shoreline feed. A 15-amp outlet with built in ground-fault breaker for the first outlet off of the plug in your wiring will do it. Don't tie the neutral to the ground on the bus, or you will trip any GFCI devices on the shoreline feed.
When using an inverter model like the Xantrex you linked to, which includes the automatic transfer switch, the power-fail protected wiring on the bus ALWAYS plugs into the inverter. If external AC is present, it passes through the internal switch to your wiring. Whenever it is not present, the inverter kicks in and continues to provide AC from the batteries.
You do not want to, "not never, not nohow," wire your bus so that the inverter output and the shoreline are both tied together permanently as dual feeds to your wiring. First, any shoreline AC flowing back into the inverter output may blow the inverter up. Second, if you do unplug the inverter while using the shoreline, but have separate feeds tied together, you will have live, lethal AC on the exposed pins of the plug for the inverter. In the same way, you will have live AC on the exposed pins of the shoreline while running on inverter.
You definitely need either/or type of switching on the feed. An inverter with an internal switch does it. A double-pole, double-pole switch to select the source does it. A double-pole, double-throw relay wired to kick in when external AC is present does it as an automatic transfer switch. Or the simple and cheap method of moving the feed plug from the inverter to a shoreline extension cord, or a single outlet by the inverter wired as the master feed from the shoreline does it. Good luck.
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.