Hadnt planned on a side project - but my son wanted to learn about computers. So we're connecting a rasp pi zero + camera up to the bird feeder to take photo's

Hadnt planned on a side project - but my son wanted to learn about computers. So we're connecting a rasp pi zero + camera up to the bird feeder to take photo's of birds, with a plan to post to instagram. So far no birds on feeder Anyone able to advise on the easier way to run it off solar power?