Simplest solution, albeit expensive solution, is to use a decent camera and power it with your own solar powered system. Figure at least a 200 watt, 24 volt, solar array, two 12 volt batteries in series with at least 100AH capacity each, charge controller, 12 volt regulator to provide 12 volts for the camera and the dedicated, encrypted, wireless link back to your BI system. Throw in weather tight enclosures with proper cooling for the active electronics and add that cooling power overhead to your total power overhead, maybe upsizing the solar array and battery capacity.
There are commercially produced systems like this, but bring your wallet. The problem is a camera draws about 7 watts plus another 3-5 watts for an RF link. Let's say 10 watt per hour total. That's 240 watts per day. A few cloudy days, like a good storm, and you run out of battery.