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Larry:
Ok a 1100 watt inverter will supply 110V at up to 10 amps AC (watts/volts equals amps). Let's ignore efficiency for now so watts output in AC is the same as watts input as DC. Divide 1100 by 12 V and you get 92 amps DC input to the inverter. Efficiency losses will raise that to about 100 amps DC.
So if you can mount the inverter within 4' of the batteries with #4 wire, you will be great.
Wiring the AC side may be the bigger challenge. Does your inverter have an internal AC transfer switch?
David
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