Power consumption of an 8-port PoE switch

An 8-port PoE+ switch typically consumes between 62 W and 150 W for PoE output, with additional base power for the switch itself depending on model and features.

Typical Power Budgets

• TP-Link LS108GP: Provides 8 PoE+ ports with a total PoE budget of 62 W, supporting up to 30 W per port. The switch itself has low base power consumption due to its fanless design, making it energy-efficient for small deployments .
• TP-Link LS1210P: Offers 8 PoE+ ports with a total PoE budget of 96 W, again with up to 30 W per port. Actual power usage depends on the number of devices connected and their individual power draw .
• AEIN-PS8082SFT-M: A managed 8-port PoE+ switch with 150 W total PoE budget, suitable for higher-power devices like multiple IP cameras or access points .

Factors Affecting Power Consumption

1. Device Load: Each connected device draws power according to its PoE class. For example, IP cameras may require 15–25 W, while VoIP phones typically use 7–10 W .
2. PoE Standards: IEEE 802.3af provides up to 15.4 W per port, 802.3at (PoE+) up to 30 W, and 802.3bt (PoE++) can deliver 60 W or more per port. The switch's total PoE budget limits how many high-power devices can be supported simultaneously .
3. Operational Modes: Some switches have Extend Mode or power management features that reduce port speed or prioritize power to critical devices, which can slightly reduce overall consumption .
4. Base Switch Power: Even without PoE devices connected, the switch consumes a small amount of power for its internal electronics, typically 5–15 W for small desktop models and higher for managed or enterprise-grade switches .

Estimating Total Power Usage

To calculate approximate total power consumption: Total Power (W) = Base Switch Power + Sum of PoE Power for Connected Devices For example, a TP-Link LS108GP powering four 15 W cameras:

• Base switch: ~5 W
• PoE load: 4 × 15 W = 60 W
• Total consumption ≈ 65 W Using a PoE calculator can help plan deployments and ensure the switch's PoE budget is not exceeded, accounting for startup currents and cable losses .

Summary

• Small desktop 8-port PoE+ switches: 62–96 W PoE budget, low base power (~5–15 W).
• Managed or higher-power 8-port PoE+ switches: 150 W PoE budget, higher base power.
• Actual consumption depends on the number and type of connected devices, PoE standard, and operational features. Proper planning ensures devices receive sufficient power without overloading the switch and helps estimate energy costs for network operation.