Load Calcs - Resi 600A Service w/ (4) 200A panels

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Skoobzzz

New User
Location
Bluffton, SC
Occupation
Electrical Contractor
First time posting and thanks in advance for anyone's help.
Any chance someone could check out my load calcs on a 1PH, 240V, 600A service with multiple interior panels?
The customer added 3 loads during the electrical walk of the home. Car Charger - 12KW, 7 seat hot tub, and infinity pool with heater & 2 pumps.
Shuffling the loads around the original 3-200A panels, each one got pretty close to the 180A I understand is my max with 4/0 SER feeds.
So I planned on adding a 4th 200A panel to cover my myself as the client & customer also want room for expansion.
I guess my question is...did I need to add the 4th panel, did I miss something, or do something incorrectly in the calcs?
I did optional method for the main service & standard method for each individual panel.

Riser Diagram
Equipment List
Load Calcs - Main Service
Load Calcs - P1
Load Calcs - P2
Load Calcs - P3
Load Calcs - P4
 
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