Inverter amp draw from battery = typically 11x the amps of the 120 volt load
or
Inverter amp draw = typically the watts of the 120 volt load divided by 11
Pure sine wave inverters are less efficient and draw a little more (10%).
The maximum rating of the inverter doesn't affect amp draw, it's what you actually plug into it.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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