C9300 Switch power when not fully loaded. Stackpower question too

[Dyer]

I have been looking through documentation and I cannot find the information I am looking for. I am working with a client that is installing Cisco 9300-48T-A and 9300-24T-A switches. Attached is how they plan on connecting the switches using stackwise/stackpower. I have included the models of each of the switches and the number of ports that will be used on each switch. 

I am trying to evaluate the loads of each switches. Two items that I cannot find information on or do not quite understand :

1. Does the power consumption change if only a portion of the ports are utilized? Right now I am evaluating them using 100% full port traffic for each switch; however, I would think I could evaluate them with a lower power consumption if only half or less of the ports are utilized.
2. How does stackpower work? I have four switches being supplied by one power source and four from another power source. There are two stacks, four in each, two powered from one source and two powered from another source for each stack. How does the load sharing work? How do I evaluate the load on what we call PDU A and PDU B?

Any clarifications would be greatly appreciated. I do not have serial numbers or other information on the specific switches, because the client I am working with has ordered them and have the information but was not shared with me. Since I do not have this information, I cannot open a case and this is my last resort. 

Thank you in advance.

[Mark Elsen]

  - Check if this documentation can help you :
             https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/white-paper-c11-741945.html

    M.

[Leo Laohoo]

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@Dyer wrote:
Does the power consumption change if only a portion of the ports are utilized?

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No, because both units are non-PoE.  Whatever power supplies are energize, that is how much watts they draw.  

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@Dyer wrote:

How does stackpower work? I have four switches being supplied by one power source and four from another power source.

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Assume that all four have 2 x 1100wac power supplies then all four will draw 8800 watts of power.  And all four will "share" the load if-and-when one switch member blows BOTH power supplies.  This means 6600 watts will be available for that switch to draw power from.