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PoE Budget
IEEE af/at/bt power budgeting for PoE devices
PoE Process
1. Find the power requirements for each device (from spec sheet)
2. Add all power requirements to determine your PoE budget
3. Specify a switch capable of providing 120% of the required budget
Formula: (mAh) × (V) / 1000 = Watts
Devices (Custom mAh Entry)
| Device | Volts | mAh | Qty | Watts | Ext Watts | |
|---|---|---|---|---|---|---|
| 6.72 | 80.64 | |||||
| 8.88 | 35.52 | |||||
| Custom Total: | 116.16 W | |||||
Devices (From Library)
Pulled from the AVGenix Equipment Library and your organization's library — any device with a known wattage and a PoE power supply. PoE standard (af/at/bt) is inferred from the power supply notes where available; a future update will store it as its own field.
Loading library devices…
Switches
| Switch Model | Capacity (W) | Max PoE Budget (W) | |
|---|---|---|---|
| 1152 | |||
| Total: | 1440 W | 1152 W |
Results
Total PoE Draw
116.2W
Switch Budget (80%)
1152W
Recommended Switch
139W (120%)
Utilization
8%
Ports Needed
16ports
Remaining
1035.8W
✓ Draw (116.2W) within 80% budget (1152W)
Large Deployment Warning: Large deployments have considerations related to cable bundle heating and cable quality. Refer to cable manufacturer recommendations and NEC ampacity tables if required.
IEEE PoE Standards
802.3af
15.4W / 12.95W
Class 0–3
15.4W / 12.95W
Class 0–3
802.3at (PoE+)
30W / 25.5W
Class 4
30W / 25.5W
Class 4
802.3bt (PoE++)
60W / 51W
Class 5–6
60W / 51W
Class 5–6
802.3bt Type 4
100W / 71.3W
Class 7–8
100W / 71.3W
Class 7–8