What inverter exactly? Does it not have instructions?
1500 watt inverter should have 3+ batteries and connected with wire to handle 150 amps. #2 should be fine to about 3 feet or #1 if 6 feet away. One or two batteries might work to just get from pedestal to pedestal. I recommend a fuse close to the positive battery terminal.
http://www.genuinedealz.com/custom-cableshttp://www.genuinedealz.com/blue-sea-systems-5001-mega-fuse-blockhttp://www.genuinedealz.com/mega-amg-fuse-150-ampTransfer switch if you want to wire it in and is not already included:
http://www.donrowe.com/KISAE-TS15A-Automatic-Transfer-Switch-p/ts15a.htm