i would get one that has 12, i think. one i added in addition or original (4), had that many, i think. put each ac on one, water pump, hot water heater. i used one for outside lights, so i could easiler turn on all at once, i case of noise. this was an add-on, or would of wired differently from beginning. remotes and motion detectors, i have had no luck with. you get the idea, anything that uses any amount, put on its own breaker. the original house was on 3, the whole house, one they didn't even use. that was with 3 ac's in the beginning. basically ever outlet and light was on one. just lovely. so i added extras, plus a safety stop, w/electrician #2. got zapped, so safety stop was useless. had another guy come, everything ok. turned off main breaker to boards, no electric in house. and the stereo never sounded so good, kept playing, without electric, it's a miracle. 4th electrician got it right, almost.
](http://www.nongkhaimap.com/nongkhaiforum/images/smilies/eusa_wall.gif)