Are you saying can I run a commercial welder directly off a HV Battery? Or are you asking if you can use an Industrial Motor Control Inverter as a welder?I have been looking at inverter welders and mig and stick/ tig are not combined in the same unit except in very high end units. mig's are constant voltage units and stick /tigs have variable voltage( high open circuit voltage for easy starts) .migs voltage 15 to 30 volts and stick/tig run about 12 to 25 volts with as high as 70 volts open circuit .
The other option is to use the standard inverter welder with a 300-400 volt battery (the same as same as I would the industrial or automotive unit) . So I don't need to run a large generator, also cleaner smother power. Don't know if I can power them with DC directly.
It’s possible to use a commercial welder directly off a HV Battery, if the welder first rectifies the input line voltage and then uses some form of PWM higher frequency inverter to step the down and control the voltage/current output. If the welder first steps the voltage down using a 50/60 Hz transformer, it can’t be used.