[funvill]

be careful POE can be anything up to 48 volts. Unless you control the input voltage. I suggest using a DC-DC converter with a larger input voltage.

[oakwhiz]

Regular PoE can in some cases get as high as 56 volts... Some PD equipment is overspec'd to deal with regulation issues on PSEs.

[tjoff]

It is passive POE, you need to supply your own input as it won't work with a POE switch or anything like that.

[aaronax]

There are some switches that supply passive PoE, such as many of Ubiquiti's products.