Simple way to figure, decide what you want to run.
Count up all the amps on your equipment.
Add 10% for safety.
Don't run anything else on that circuit!

Run, just like Tex said, only up to 80% of the rated capacity (yes, AFTER the first 10% lol! no cheating!) of the breaker on each circuit you are using. You DO end up with surges running grow equipment, and this wiggle room will keep your home safe.