24 volt mot power supply

I am wanting to build a 24volt power supply with all the amps I can get. I want to use on my mig welder it's battery powered but would very helpful if I could ur a power supply when near 110 volt Fri the house

Welcome to ETO!
Google gives you this.

I'm try to figure what size wire and how much of it for my secondary. I have an older one with a good copper primary coil. So I hope there is room and all. Anyone be able to steer me in the right direction