Be insightful in your search. Sometimes it’s worth spending a few extra pennies on a famous brand.
Quality of solar panels
The larger panels are not as portable as these pocket panels, but are well worth the extra weight to charge our phones to the field. We recommend buying a separate external battery power bank, almost any 5000-15000mAh battery will do the trick.
A 4 or 5-watt panel works great for small portable devices , such as a cell phone or a simpler mp3 player. However, many smart phones like the iPhone, especially the latest models are extremely energy hungry, almost as much as an iPad or a tablet. In general, you need at least one 7-watt board to be sure you can charge most smartphones .
Some solar charging devices include a battery so you can leave your camera unattended in the sun for hours, charge …