The gage of the cable is determined by the length of the run X 2. This is determined by the amperage load at maximum draw. There is a rule for this but since I can't remember it....I won't try it.
If you live near a West Marine or BOAT/US store, go there and tell them you need to install an inverter...in a boat. Tell them the wattage of the inverter and the distance from the batteries to the inverter. If the inverter will be 6 feet from the batteries, then the run is 12 feet. They can sell you the correct cable. It will be marine grade and stand up to abuse. You want to use marine grade because it contains "fine" strands and will not be subject to vibration shearing. Also, use heat shrink connectors. They can sell you the heavy duty fuse/fuse link as well. Don't use just any cable....it will lead to problems later.
Or call their 800# that is on the page at this link and speak with a product advisor:
http://www.westmarine.com/webapp/wcs...atalogId=10001
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