I have a 200 amp service in my main box. What else(if anything) runs off the 70 amp panel? Does the blower use all 70 amps when you start it up? If it does I bet the lights go dim for a sec!
I'm asking this because I would like to add a sub panel to my box to run my shop, and use higher powered stuff than my 2.2kw spindle and 220v delta unisaw.