Just checking lest I miss something: in Raspberry Pi chassis supporting multiple boards, the only sensible power distribution option is really to use the PoE HAT and wire all the RPis to a PoE switch — did I get that right?
I build a custom PI cluster chassis. Does not use PoE for power, since that is inefficient and expensive. Compared to doing building it in to the design directly. Essential 12V power bus and point of load regulation.
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@ascherbaum realistically at most 96 into 2U, needing 4x 10Gbe uplinks. So like 1920 per rack with ToR switches for interconnect.
That's also ~960W per 2U.
@intrbiz Switches is a whole different topic, and power is always outsourced ;-)
https://andreas.scherbaum.la/post/2024-06-28_how-many-raspberry-pi-can-be-operated-in-a-shipping-container/