theoretically, ive never seen a welder run off an inverter. then again, im used to much bigger welders. Also note that on an inverter, there is as limited amount of time that one can use it at max rated output. usually on the order of 10 minutes i belive, but dont quote me on that, check the manual. I would also expect that you would need to have youre engine running so as to not kill the battery, and i dont think welding onto the chassis which is youre power supply ground is such a good ides, so make sure to only weld things that are not on the XJ.