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automated camera for daily photos of construction site
(lemmy.world)
Community about the single-board computers, micro-controllers and related projects.
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Given the relatively temporary nature of the use case, in your shoes I'd opt for a rechargeable power bank of some description instead of relying on a small solar set up.
I've used a dash camera connected to a power bank for a similar purpose. I'm sure an rpi would sip power in comparison.