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How long before power is available on the job site? I have been involved in building houses and the power panel is the first wall to be built so that power is available to the crew. Could you strap the device to a tree and power off of a car battery until the on site power is available?
Using a large external power source with a power on/off timer, running only during daylight hours could save lots of watts.
I’ve looked into solar for a bird house camera and it was not a trivial project when you get to the short winter days and potentially cloudy skies.
Given my skill with 3d model creation, i’d be more likely to create something that would hurt me than inflicting harm on someone else. Mostly when I take that razor sharp tool to remove anything from the build plate, but also just my awful measurements and tolerances.