Well, a socket or a connector for the car charger for conventional USB charger is available almost everywhere nowadays. But only almost. Even during the multi-day hike or boat, or bike with tent-night, it may happen that the battery makes faster limp than one would like. And it literally means "in the woods" is suddenly disoriented and without phone contact.
The tested here Poweradd 20W solar charger is folded 26.5 x 78.5 cm and weighs 580 grams. It is therefore more suitable for use around the garden shed. For attachment to backpack it's safe too long.
The solar charger can not do it fast, but are independently reloaded. The device is foldable and built a protective bag. Four 13 x 22 cm large solar panels can give two 5-volt outputs a total of 4 amps.
Who would like to daytime power and charge your smartphone / Navi night, tinkering with a Poweradd Pilot S 12000mAh 2 USB Super capacity? T Power Bank Portable Charger Stand External Battery with Digital screen f'¹r iPhone 5S 5C 5 4S 4, iPods, iPad 2 3 4 Mini (Apple adapter not included), Samsung Galaxy Note 3 S4 S3 S2 Note 2, Blackberry, HT ... a "storage plant". During the day, the battery takes up the current and feeds at night the phone!
Oh yes: The digital capacity indicator of the pilot S we have determined that under optimal conditions - sun and blue skies, alignment always be tracked towards the sun - can be "produced" 1,400 mAh / hour of electricity. An average smartphone battery should therefore be charged in approximately two to three hours from completely empty to the brim.
