30 A is 120V power. You simply can't power a good sized A/C and a microwave and everything else you've got on on the same 30A circuit.
It's like the old "Green Acres" skit where Oliver has to explain to Lisa that he's labeled all the appliances 1,2 or 3 according to their draw, and you can't go over 5, or something like that. Funny, and exactly the same principle.
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