Designing Solar Power Systems
This page is for FM translators (those FM transmitters for out in the sticks where city transmitters can't reach), but the details apply whatever your needs: determine how much you're going to draw 24 hours a day, figure out how much sunshine you get in a day (usually about five hours), then put 24 hours of your needs in a battery every day whether it's sunny or not.

That means you need a lot of solar power going into your batteries, and you need a lot of reserve in your batteries. Going totally solar is extremely expensive. This will help you determine if it's worth it for your application.