Electricity from low voltage powerlines

We contemplating installing our cnPilot E500 on electric poles (not street lights) and get the power from the low voltage power lines.  I would appreciate if someone will be willing to share experience, advise, pictures diagram.

are you planning to use the passive PoE injector to power the e500? If so, will you have it in an IP67 waterproof box? 

do you have details on the power available on those electric poles that you want to use to run the e500?