I had to installed some IP bullet cameras in some PVC pipe on a Hopper dredge to protect it from the salt water spray. They are outdoor cameras but they are made out of aluminum and they will rust if left unprotected. I sealed them in the pvc and used a cgb from the wire as well as sealant on the threaded end cap (for access to the connection). After being installed a few days later it started to form moisture on the inside of the lens. I added desiccant packs and also ended up adding a pressure compensation device on the bottom thinking it may have needed some ventilation since the camera generates heat and causes a pressure difference. After making the changes the moisture cleared up and they seemed to work fine for a few months while in the shipyard with no issues. The dredge left the shipyard in Louisiana and went to the jobsite in Delaware and now the problem is back but only on a few of the cameras and not all the time either. I figure it is more likely temperature changes (it's pretty nippy out here) not to mention the high moisture content from being out in the Atlantic ocean. I was thinking of adding heaters but since it is POE cameras I would need a way to first not exceed the total wattage of the 48VDC power injected and have a way to pull the power out and split it between the camera and the heater in each location. (I have seen older style RJ45 couplings that I could use for this that punch down like a phone connection). I would like to know if anyone has any thoughts on if that would work or have a better solution that I haven't thought of. Any help would be greatly appreciated. I would have liked to go with stainless steel housings for the cameras and not have to deal with all of this but my bosses wouldn't go for the price tag. Three of these cameras are critical to operation and really need a solution. Thanks in advanced for your help.