Before selecting equipment, understand these key PoE standards:

• 802.3af (PoE): 15.4W switch port budget, ~12.95W to device
• 802.3at (PoE+): 30W switch port budget, ~25.5W to device
• 802.3bt (PoE++): Type 3 (60W) and Type 4 (90W) switch budgets
• Ubiquiti Passive PoE: 24V or 48V passive (non-standard) – use with caution
• PoE Max Budget: Total power available from switch (shared across all ports)

Wi‑Fi 7 models (U7 series)

E7 Wi‑Fi 7 high‑power series

Wi‑Fi 6 / 6E models

Legacy Wi‑Fi 6 / 5 models

Critical Power Considerations for Newer APs

The 10GbE Uplink Impact

APs with 10GbE ports (U7 Pro XG/XGS, E7 series) don’t inherently require more power for the Ethernet interface itself, but their advanced radios and processors often demand higher power budgets.

Redundant Power Ports

E7 series and some U7 models feature dual Ethernet ports for power redundancy. These can be configured in:

• Active/Standby: Primary port provides power, secondary is backup
• Load Sharing: Both ports active (requires compatible switch setup)

Real-World Power Planning

Always add 20-30% overhead to theoretical calculations. Factors increasing consumption:

• All radios transmitting at high power
• Maximum client connections
• Environmental factors (cold temperatures)
• Future firmware features

Recommended Switches for UniFi APs

Managed Switches (UniFi Ecosystem)

Unmanaged Switches with PoE

Specialty Solutions

• PoE++ Injectors: UPOE-AT (60W) for single high-power APs
• Midspan PoE Injectors: For non-PoE switch backbones
• Industrial PoE: For harsh environments

Installation Best Practices

1. Power Budget Calculation

Total Required Power = (AP1 max draw) + (AP2 max draw) + … + 30% overhead

Total Required Power = (AP1 max draw) + (AP2 max draw) + ... + 30% overhead

Example: 5x U7 Pro Max = 5 × 21W = 105W + 30% = 136.5W minimum switch budget

2. Cable Considerations

• Cat6a or better for 10GbE links
• Maximum 100m length per Ethernet standard
• Avoid cable couplers which increase resistance

3. Switch Stack Power Management

When stacking switches, PoE budgets are NOT shared between units. Each switch must independently power its connected devices.

4. Power Priority Configuration (Managed Switches)

Configure critical APs as "High" priority in UniFi Controller to ensure they maintain power during budget constraints.

Troubleshooting Power Issues

Common Symptoms and Solutions

Diagnostic Commands (SSH to AP)

Future-Proofing Your Deployment

1. Plan for WiFi 7: Even if deploying U6 now, ensure switches support PoE+ minimum
2. 10GbE Ready: Newer APs benefit from >1Gb uplinks
3. High-Density Areas: Deploy switches with 30W+ per port capability
4. Modular Power: Consider switches with expandable power supplies

Final Recommendations

Always: Purchase APs and switches from same generation when possible

For new deployments: USW-Enterprise-24-PoE provides best future-proofing

For budget U7 deployments: USW-Pro-24-PoE offers excellent value

For legacy upgrades: Verify existing switch PoE budgets before adding WiFi 6/7 APs

*Note: Specifications may change with firmware updates. Always verify latest requirements in official UniFi datasheets before procurement. When in doubt, over-provision power capacity by 30-40% for headroom and future expansion.*

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