Another thing.. In my last post I mentioned both 30 and 50 amp. If you have an electrician install an outlet off that sub panel.. Have him put in a 50 amp outlet.. They will do that right.
IF you have a pre-existing outlet in the 30-50 amp range for tools like welders and air compressors.. Very good chance if you plug in you will be sorry.. 50 amp service is 240 volt, FOUR WIRES,, Welders and Air Compressors and other heavy gear are 240 volt THREE wires.
In the RV world 3 wire outelts are 120 volt
plugging into a welder outlet lets the magic smoke out of your expensive electronics, and you can not easily put it back.