I do time-lapse photography but only for periods of an hour or so - cloud movement, sunrises/sunsets, etc... A lot of times, when a new building is going up, the owners will want a time-lapse video of the process spanning several months. From Digital Photography Review:
Enlaps Tikee time-lapse camera packs two lenses and a solar panel
Tikee by French company Enlaps aims to simplify time-lapse photography by combining a 4.5W solar panel, wireless connectivity and a pair of lenses into a single capture device. The device itself is described as completely self-sufficient, weatherproof and accessible via a Web application.
The idea behind Enlaps is that long duration time-lapse photography can be difficult depending on location due to potential power source and weather issues. Tikee and its more sophisticated counterpart, Tikee Pro, solve this by providing everything necessary for time-lapse photography in a single wireless and weatherproof product.
Very clever - they do not have to worry about replacing the battery every so often and with the two lenses, you get up to 220° of panoramic vision. $750 for the Standard and $900 for the Pro (adds digital RAW files, GPS and 4G modem) - if I was putting up a building, this would be pocket change for a very wonderful resource.