I'm looking to add a hot tub, and after my basement build out a few years ago my panel is full. (By "full" I mean we added a sub panel and now my 400 amps is "technically" spoken for by 400 amps of breakers, though of course our load is never anywhere close to that.)
I'm not unfamiliar with these principles (I wired the basement buildout myself and had my electrician friend and inspector sign off on it.)
What I'm looking for and can't find, likely because I don't know what to look for, is some sort of intelligent switcher or breaker. Something that would allow me to say, share the 50amp 220 from the clothes dryer with the hot tub, so when the dryer was running the hot tub would be shut off.
I don't want to unsafely overload the panel or make modifications that would get frowned on when the house is sold. The power company wants thousands of dollars to "upgrade" my feed to 800 amps. I don't need 800 amps ... I need to safely, legally and automatically share 50 amps between two circuits.
What can I do here?