To your 12 volt power supply on the converter they usual run a #6 wire good for 30 Amp.
An Inverter [12 volt to 110 Volt]is a different story on a 3000 watt you'll probably run #1 only 36" long.
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2014 Ram 1500 CrewCab 4x4 5.7 Hemi 3.92 Rear and Air Lift 1000
2005 Jayco Jay Feather LGT - 29Y GVWR-7000 lbs.
Dexter Axle Lift 4-9/16" - installed with sub-frame.
Pro Series 1200 lbs. WDH with Double Sway Bar.
Champion 3100/2800 watt Inverter/Generator-Onboard Solar Power
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