I'm not sure why everyone wants welding wire or 0 gauge. A 1500 watt inverter only draws about 15 amps. It's the same as a house and 10 gauge wire is used for that type of load. The fuse would blow before anything happened so not sure why your all calling out for such an overkill.

You can check the electrical wiring code or ask an electrician but 0 gauge or anything larger than 8 gauge is a waste. I'm sure there are a bunch of EE's on here who can back this up!

 

To get 1500w from an inverter, you have to provide about 125 amps at 12V (125*12 = 1500). If you try to push that 125A thru a small diameter wire, the resistance of the wire will cause a lot of heat. Enough heat and you'll find smoke. Flames may not be far behind.

In a house with a 1500w load, you're dealing with 15 amps at 110v AC. If the house were running at 12v AC and you put 1500w loads on the outlets, the house would be wired with 4 gauge wire! That's why local code requires 10 ga wire for 30 amp circuits.

It's all in the amps man!