Hi, I am building a project at home that will eventually be installed in a location with limited access to power. I do not have a PoE switch at home but this will be installed where there is PoE available.. My question is this: Can I use the Ethernet Shield W/PoE using a Wal Wart at home while testing and debugging then install in a location that will derive power via PoE??
Ethernet Shield w/POE Schematic
from schematic, you could run with normal power hookup. However I do not have Ethernet Shield w/POE and never did myself. YMMV
I've used the POE shields. They work with a regular non POE network just fine. Without the POE switch your Arduino will work with either the USB power or with a separate 'wall wart'. When it's connected to a POE switch it runs great with no extra power sources needed. Even when you're on a POE network you can still connect your computer to the Arduino via USB. The two supplies 'together' don't cause any trouble.