Know your closet's heat load before you rack the switches
Enter your switch count, active PoE ports and power supplies. Get minimum, expected and maximum BTU/hr, cooling tons, and the amps you need at 120V, 208V and 230/240V.
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Built for switch stacks
Ports, active PoE ports, PoE class, PSUs and PSU wattage per switch, multiplied across every switch.
Min, expected, max
Idle draw, real PoE load, and the N+1 worst case your power supplies can actually deliver.
Electrical load
Amps per switch and in total, plus the circuit size you need under the 80% continuous-load rule.