This will be somewhat of a shorter article than the rest, but it will hopefully give you some information. If you haven’t heard already, my iPhone is currently running off of solar energy. My home doesn’t have any panels on its roof, but I am relying on a small device that charges my phone when the sun is shining.
Anyway, I must admit, the phone was running off of the wall for about a day and a half last week. From that, I can conclude that if you have a tiny solar panel like mine, phones cannot run solely off of it. However, if you save your energy, unlike me, it will help tremendously.