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Q: Is PoE energy efficient inside your home? (feddit.nl)

submitted 1 year ago* (last edited 1 year ago) by HoornseBakfiets@feddit.nl to c/homelab@lemmy.ml

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Is PoE more efficient than plugging in adapters for each network device?

And at what scale does it start to matter?

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From my perspective; I’m going for a 3 node mesh router, plus 2 switches, and was considering if in 5 years time the electricity difference would be less than the extra upfront cost. The absolute max length of cable would probably be around 30m

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[–] antlion@lemmy.dbzer0.com 1 points 1 year ago (1 children)

Considering the PoE switch is also powered by an adapter, I’d say no. Your have the same efficiency from the AC-DC conversion plus line losses.

[–] DJArbz@lemmy.notmy.cloud 3 points 1 year ago (1 children)

Converting power once vs X times definitely has an efficiency factor.

[–] JustEnoughDucks@feddit.nl 2 points 1 year ago

Really depends. If you have 1 device that uses 10W with 90% efficiency, you lose 1 W. If you have 10, 1W devices with 90% efficiency, you lose 1 watt.

It is less efficient if X device has lower efficiency or if you have DC/DC converters in series (which is likely with PoE), but likely it is negligable difference.