camo200sx

Hi guys! New here. NOt asking anyone to do any research or anything for me but if anyone can throw me a few ideas I'll be away. OK...Scenario We have a couple of large gas tanks in a remote place that have been ripped off. Basically I need a way to monitor the area day and night when we are away, and record anyone who tries to steal gas. No power etc in location. What options have we got? Thanks!