Posted by a reviewer on Amazon

Strongly recommend to use it for charging a battery bank it will take 2 hours to charge an iphone

Posted by a reviewer on Amazon

Needed to be in direct sunlight in order to make it work

Posted by a reviewer on Amazon

In that time i get enough energy to charge a phone full

Posted by a reviewer on Amazon

Either way the benefit of having a continuous charge from two of these two small panels seems to outweigh the faster charge rate of the larger panels for refiling my batter pack in everything but ideal conditions especially if i am not available to make sure that i do not need to manually reset unplug and replug the usb the pack charging from the larger panel which while minor does seem to happen a couple times per day

Posted by a reviewer on Amazon

That said when i purchased this panel there was an option to get an included battery pack for a few dollars more

Posted by a reviewer on Amazon

The battery that came with it is not likely to satisfy the need for a charging with this panel

Posted by a reviewer on Amazon

The pack i received looses charge over night and often only puts out nearly the same amount of power received from the panel leaving the problem of charging a phone unsolved

Posted by a reviewer on Amazon

If you connect 2 or more of these with usb y cables and one panel fails you still have the others to use if the wire in a folding panel fails that may mean no more charging at all