I have a manual for the welder, it says the generator is a 40 volt
generator and puts out between 40 and 250 amps. I am not knowledgeable
enough to know what you mean by a dc shunt. Where would I find one of
those and what is a "lot of amps" - when you say "spin one up" are you
talking about the shunt, the generator, or what? Scrounging 3 12 volt
car batteries is not a problem. I am in Texas so NE Illinois is not
very close; also, I have a couple of dc battery charges where I keep
the welder, but I assume they put out only 12 volts or so since they
are intended to charge only one battery at a time. Thanks for your
help.