Sorry, but since this is a different question, I figured it needed its own thread...

It looks like for my purposes, and to keep from having to upgrade my electrical when the itch for say a 3HP cyclone becomes too great to resist... I should be going with a 100 amp sub panel in the garage / shop.

Now how on earth do I tap 100 amps off of an already full main panel? I wouldn't think that would be wise... So how / where do I get my 100 amp service to the garage from?

Mind you, I have home wiring upgrade projects that ought to be taken care of, so upgrading the main is not out of the question, but to what?

I at present have a 150 amp main load center in my house with 16 slots, all of which are filled.