Reply by cutworm

I’d go ahead and run a new circuit to your shop before buying anything. Run 240 60 amp service to the shop and install a breaker box in the shop. It it is more than 50’ to your shop go up 1 size in wiring. I’d go with #4 or #2 copper depending on the distance of your run. Measure the voltage with things off and things running. Voltage shouldn’t drop any more than 5% or so. If it does you need bigger wiring. With 14 AWG it’s a no brainer. Replace it.

-- "Actions speak louder than words but not nearly as often." - Mark Twain