I just finished a service entry for a house with an attached dwelling. The main house wanted more than 200 amp capability, so the decision was to have 320 amp service to the house and separate it into 2 - 150 amp panels. One of the panels will provide for the attached dwelling with a 100 amp sub panel and the remainder of that 150 amp panel will provide for the main house mechanicals.
A point of debate now is whether to have two AC units on the same 150 amp panel. This is a question that a friend posed (who is not a professional electrician, but an engineer), who was concerned of the possibility of current overload of that whole panel, in the case the two AC units ever experienced LRA current draw at the same time. The ACs are both 3 ton with LRA of about 60 and MOP of 30. The reason I am defending the position to keep the two on the same panel is for organizational cleanliness.
I would love to get others input.
Thanks for the thoughts.