Bests & Worsts Reviews from Amazon

I purchased the 21W Anker Solar Panel from Amazon a little over 2 years ago during which time I only used the panel 12-15 times due to the issues I experienced with it. NEGATIVES - - The Solar Panel will deplete the attached battery/device as opposed to charge it roughly 50% of the time - Direct Sunlight Required - Even when in direct sunlight the solar panel stops charging randomly and won't start charging again until you unplug the attached battery/device from the USB port and plug it back in. PROS - - Relatively lightweight - Water resistant - 2 USB Ports - Has nice rings for tie down to a pack, window, car, etc. - The case is decently made and should hold up well through extended use in the field I would also recommend you avoid RAVPower's solar panel as well as there are identical complaints with their panel as well in both the reviews on Amazon as well as elsewhere on the web.