This is DAYTIME usage, which will be less than night mode. I will update this when I can do a night mode test.
Here’s the typical power usage. It goes up and down a bit depending on activity, but you can see from the graph that it varies so little as to barely be a blip. So let’s just go with 1.67 watts as a nominal number. That’s 40 watts a day. If we look at one of the jump start packs with USB out, like my Anker 15k pack, it has 180 watt-hours of capacity. So the camera could run for 4.5 days on it. Add a small solar panel and you’d be good for much longer. Add a medium solar panel and it would run forever on a smaller battery that can at least carry it overnight.
After 1.5 hours exactly, the total consumed power was 2.468 watt hours or 486mAh. That’s 1.65 watts per hour, which jibes perfectly with the math above. So both in theory and reality, you can use these numbers to calculate battery/solar needs.