I bought one of these kind of on a whim, thinking that with tropical storms sometimes knocking power out here, might be a good idea to have some means to charge up my phone if the outage becomes extended long enough for my phone and power banks to become depleted. So as long as I have sunlight, I will be able to charge things up. I tested it out today, just to see if it works, and it charged my phone from 71% to 80% in just a couple of minutes. So I think it will work just fine if and when needed.