I want to thank all for their valuable viewpoints.

Let us get back on topic.
This is all about a load schedule.
First, these are super-smart units. Highly efficient variable speed motors. I have 11 units in a line up. If one unit drops out, redundancy management software causes failed unit's load to be picked up by the remaining ones.
I say
one 400A 3 phase panel will serve this monolithic family of outdoor units for one building.
Why????
Using the MCA approach:
11*31.9*1.25 = 438.62 (Intuition alone says too high.....overshoot 400A by a measly 38.62A but does overshoot)
Use the more reasonable approach:
11*19.6*1.25 = 269.5A
Does anyone think that a 400A service is undersized for this job and consequently force a 600A panel solution with increased expense in feeder and panel???? Please remember also that these are brand new latest technology split system units where the motors are never stopping/starting but are always running in medium to slow speed range under closed loop feedback control.
Again keep your thoughts coming. This is the best site bar none.
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