How To: Battery powered Passive POE for Ubiquiti device

Ubiquiti device POE specifications: 10.5V ~ 25V DC

Network port pin out:
Pairs 4, 5 (+)
7, 8 (-)

For 100M device:
Use pin 4, 5 as +, pin 7, 8 as -.

For 1000M (1G) Device
We need transformers pass through data and inject power.

Plan A:
Li-ion battery x2 , 8.4V – 6V. DC-DC step-up to 14V (double volt)

Plan B:
Li-ion battery x3 , 12.6V – 9V. DC-DC step-up to 21V (double volt)

Plan C:
Lead battery x1 ,12V. DC-DC step-up to 24V (double volt)

24v passive POE power Injector:
Plan A:
ER-X SFP Gigabit POE port x5
Plan B:
千兆POE供电器 POE分离器 Gigabit Passive PoE PSI348G

P.S.
to do:
Protection?
ESD – Transient Voltage Suppression Diodes (TVS)
Lightning Surge
PTC Polyfuse 1.25A

gas tubes, reverse diodes and MOVs?
====================================================
2018 Aug 28 update:

802.3at/af :
TL-SG1005P 5 port 1000M switch (53.5V DC 1.13A input)
Single Port max 30W, Switch Max 57W.
$289 CNY

Link:
power over ethernet tutorial

DIY 1000M POE

Waterproof Ethernet Surge Protector High PoE+/ESD Gigabit 1000Mbs – Thunder/Lighting Outdoor Protection

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RJ45 WITH INTEGRATED MAGNETICS for POE

Gigabit Passive PoE injector power over ethernet

千兆-POE供電模塊