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Why is PoE so popular then?

• samatman 7y ago
  > PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA[2][3]) on each port.[4] Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable. 84% efficiency sucks. It's a reasonable solution for some cases, because if you're running Ethernet to a camera already, hey, why not provide some power? But for, let's say 300W of lighting that runs 12 hours a day, you're wasting about 15kWh of electricity per month. Residential wiring has internal losses under 1%. I would rather not.
• Gibbon1 7y ago
  PoE is popular because electricians are expensive. That said I think there is a lot of potential to use the newer higher power PoE standards or similar for smart houses. The newer standard go up to 100W. One thing about efficiency is low voltage DC/DC converters are always fighting for efficiency. It's much less of a problem for higher voltage DC/DC's. This is due to fixed voltage drops and I squared R losses.